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Advanced Corrosion Protection through Coatings and Surface Rebuilding
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Advanced Corrosion Protection through Coatings and Surface Rebuilding

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Corrosion, Wear and Erosion".

Deadline for manuscript submissions: 30 November 2024 | Viewed by 29352

Special Issue Editors

Dr. Hongyu Wei

E-Mail Website
Guest Editor
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Interests: corrosion; corrosion protection; corrosion testing; coatings; surface mechanical treatment; functional surface rebuilding
Dr. Bassiouny Saleh

E-Mail Website
Guest Editor
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Interests: functionally gradient coatings; additive manufacturing, electrochemical corrosion investigations; magnesium alloys; surface mechanical treatment; wear; severe plastic deformation
Dr. Hongwei Shi

E-Mail Website
Guest Editor
Corrosion and Protection Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Interests: smart coatings; nanocomposite coatings; advanced functional coatings; surface science; corrosion

Special Issue Information

Dear Colleagues,

Coatings and surface rebuilding, among other things, are by far the most important technologies for protecting metallic surfaces from corrosion. Recently, industrial growth has necessitated the development of coatings and surface rebuilding with specific properties that are suitable for a wide range of operating conditions. As a result, numerous coatings such as functionally graded, sustainable, smart, organic, and hybrid coatings, have been developed. This can be seen from the rapid advancements in many engineering applications, such as biomedical, automotive, aerospace, construction, and marine engineering, as well as cutting tools, repair parts, consumer goods, and so on.

We are delighted to invite you to contribute original research articles and review papers to this Special Issue of Coatings. Contributions should focus on the fundamentals and applications of advanced corrosion protection through coatings and surface rebuilding.

Topics of interest include, but are not limited to, the following:

  • Novel ideas in the mechanisms of corrosion protective and preventive coatings using experimental, simulation, and theoretical analysis.
  • Recent advances in sustainable coatings, smart coatings, organic coatings, hybrid coatings, and graded coatings.
  • The most recent advances in test methodologies that take into account mechanical, chemical, and electrochemical interactions, as well as the capacity to estimate the performance of coatings and surface rebuilding.
  • Understanding the mechanisms of coating degradation caused by corrosion, wear, or other dynamic loading situations.
  • Trendy materials, applications, and manufacturing techniques for coatings and surface rebuilding.
  • Characteristics evaluation of corrosion-resistant coatings and nanostructured composite coatings.
  • Environmental effects of coatings and surface rebuilding produced by various methods, such as additive manufacturing, thermal spray, laser and plasma methods, sol-gel, and so on.

We look forward to receiving your contributions.

Dr. Hongyu Wei
Dr. Bassiouny Saleh
Dr. Hongwei Shi
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Coatings is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • corrosion evolution and protection mechanisms
  • protective corrosion coatings
  • extreme environments
  • performance and damage evolution modeling
  • functionally structured coatings
  • surface treatments
  • protective surface rebuilding

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Published Papers (14 papers)

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Editorial

Jump to: Research, Review

3 pages, 182 KiB  
Editorial
Advanced Corrosion Protection through Coatings and Surface Rebuilding
by Bassiouny Saleh, Reham Fathi, Hongwei Shi and Hongyu Wei
Coatings 2023, 13(1), 180; https://doi.org/10.3390/coatings13010180 - 13 Jan 2023
Cited by 5 | Viewed by 4636
Abstract
Corrosion is a costly and dangerous phenomenon that affects many industries, leading to significant economic losses and, in some cases, catastrophic failures [...] Full article
(This article belongs to the Special Issue Advanced Corrosion Protection through Coatings and Surface Rebuilding)

Research

Jump to: Editorial, Review

12 pages, 4678 KiB  
Article
Enhanced Anti-Corrosion and Biological Performance of Plasma-Sprayed Nb/ZrO2/HA Coatings on ZK60 Mg Alloy
by Xiaofeng Wan, Siyi Fang, Shouwei Xu, Lu Yu, Jingling Zhou, Shuangqing Qian, Fenglai Huang and Chunhui Ma
Coatings 2024, 14(10), 1282; https://doi.org/10.3390/coatings14101282 - 8 Oct 2024
Viewed by 626
Abstract
Niobium (Nb) and zirconium dioxide (ZrO2) were doped into hydroxyapatite (HA) to fabricate HA-based composite coatings prepared on a ZK60 magnesium alloy by plasma spraying technology to improve anti-corrosion and biocompatibility for clinical applications. The results revealed that the Nb-enriched coating [...] Read more.
Niobium (Nb) and zirconium dioxide (ZrO2) were doped into hydroxyapatite (HA) to fabricate HA-based composite coatings prepared on a ZK60 magnesium alloy by plasma spraying technology to improve anti-corrosion and biocompatibility for clinical applications. The results revealed that the Nb-enriched coating exhibits fewer cracks and pores with a flat surface due to the decreased temperature gradient during spraying, and small needle-like structures can fill the cracks and pores in the ZrO2-contained coating, resulting in a more uniform and dense surface. Compared to coatings with only niobium or zirconium dioxide, the ZrO2/Nb/HA composite coating significantly enhanced the mechanical properties and corrosion resistance of the magnesium alloys. Among all the specimens, the ZrO2/HA coating and ZrO2/Nb/HA coating revealed high surface hardness values (327.73 HV and 293.80 HV, respectively). However, the higher hardness value made the ZrO2/HA coating fragile and more likely to crack, while the ZrO2/Nb/HA coating avoided this shortcoming and exhibited a more comprehensive performance. During immersion tests, the ZrO2/Nb/HA coating exhibited a gradual pH increase and minimal mass loss, and the cytocompatibility test demonstrated promising cellular activity. Full article
(This article belongs to the Special Issue Advanced Corrosion Protection through Coatings and Surface Rebuilding)
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14 pages, 10539 KiB  
Article
The Corrosion Resistance of Tartaric-Sulfuric Acid Anodic Films on the 2024 Al Alloy Sealed Using Different Methods
by Chao Wang, Shineng Sun, Yunhe Ling, Haifeng Tan and Chunlin He
Coatings 2024, 14(6), 733; https://doi.org/10.3390/coatings14060733 - 8 Jun 2024
Viewed by 791
Abstract
Tartaric-sulfuric acid anodic (TSA) films were prepared on the surface of the 2024 Al alloy. These films were sealed with cerium salts at 25 °C and 65 °C, hot water, and dichromate. The morphology and corrosion resistance of the anodic films were investigated [...] Read more.
Tartaric-sulfuric acid anodic (TSA) films were prepared on the surface of the 2024 Al alloy. These films were sealed with cerium salts at 25 °C and 65 °C, hot water, and dichromate. The morphology and corrosion resistance of the anodic films were investigated using a field emission scanning electron microscope/energy-dispersive spectrometer, an electrochemical workstation, an acidic spot test, and an immersion test. The results indicated that the surface of the TSA film sealed with cerium salt at 65 °C had a slightly lower cerium content compared to the TSA film sealed at 25 °C. It was found that increasing the sealing temperature of cerium salt could enhance the corrosion resistance of the TSA film. After immersion in a 3.5 wt.% NaCl solution for 336 h, no obvious corrosion pits were observed on the surface of the TSA film sealed at 65 °C, whereas many larger corrosion pits appeared on the surface of the TSA film sealed at 25 °C. The improved corrosion resistance of the TSA film sealed at 65 °C could be attributed to the synergistic effect of cerium oxide deposition and the hydration reaction. The corrosion resistance of the TSA film sealed at 65 °C was significantly better than that of the film sealed with hot water, but it was still lower than that of the TSA film sealed with dichromate. Full article
(This article belongs to the Special Issue Advanced Corrosion Protection through Coatings and Surface Rebuilding)
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13 pages, 5229 KiB  
Article
Effect of Doping Trace Rare Earth Elements on Corrosion Behavior of EH36 Offshore Platform Steel
by Shujia Zheng, Na Liu, Yang Liu, Xiaoning Wang, Lina Qiu and Aijun Gong
Coatings 2024, 14(4), 413; https://doi.org/10.3390/coatings14040413 - 30 Mar 2024
Viewed by 1078
Abstract
EH36 offshore platform steel, La (0.0031%) steel, Ce (0.0027%) steel, and Pr (0.0001%) steel were selected as the research objects. The corrosion of four groups of steel was simulated by immersion experiments. In the presence of Cl− the effect of rare earth [...] Read more.
EH36 offshore platform steel, La (0.0031%) steel, Ce (0.0027%) steel, and Pr (0.0001%) steel were selected as the research objects. The corrosion of four groups of steel was simulated by immersion experiments. In the presence of Cl− the effect of rare earth elements (La, Ce, Pr) on corrosion was investigated by the weight loss method. The morphology of the corrosion products and the apparent morphology after the removal of the corrosion products were observed by scanning electron microscopy (SEM); the main components of four steel corrosion products were analyzed by X-ray diffraction (XRD). The electrochemical behavior and the influence of temperature and Cl− concentration on the corrosion of the four kinds of steel were analyzed by an electrochemical polarization curve and Nyquist diagram. The results showed that the addition of trace rare earth elements, La, Ce, and Pr, to EH36 offshore platform steel can reduce the corrosion rate and the corrosion current density (Icorr), and increase the charge transfer resistance during the corrosion process. The Icorr of La steel, Ce steel, and Pr steel is 6.59 × 10−5 A·cm−2, 7.57 × 10−5 A·cm−2, and 9.53 × 10−5 A·cm−2, respectively, which is lower than that of EH36 steel (Icorr = 1.82 × 10−4 A·cm−2). The influence of Cl− concentration and temperature on the four steels showed the same trend; that is, with the increase in Cl− concentration, the corrosion rate first rises and then slows down, and with the increase in temperature, the corrosion rate gradually accelerates. Rare earth elements promote the production of more α-FeOOH in the rust layer, and the compactness of this product plays a certain role in protecting the steel matrix. The addition of trace rare earth elements, La, Ce, and Pr (less than 0.004%), improves the corrosion resistance of EH36 steel. Full article
(This article belongs to the Special Issue Advanced Corrosion Protection through Coatings and Surface Rebuilding)
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16 pages, 5134 KiB  
Article
A Study on the Influence of the Electroplating Process on the Corrosion Resistance of Zinc-Based Alloy Coatings
by Fan Cao, Jianpeng Wang, Yuli Lian, Yuanhao Wang, Xue Wang, Xiaomin Wang, Aiqing Song and Lei Shi
Coatings 2023, 13(10), 1774; https://doi.org/10.3390/coatings13101774 - 16 Oct 2023
Cited by 4 | Viewed by 3474
Abstract
A comprehensive analysis was conducted to examine the crystal phase composition, surface and cross-section morphology, elemental composition, thickness, and corrosion resistance of coatings. X-ray diffraction (XRD) was employed to investigate the texture and crystal phase of the materials while scanning electron microscopy (SEM) [...] Read more.
A comprehensive analysis was conducted to examine the crystal phase composition, surface and cross-section morphology, elemental composition, thickness, and corrosion resistance of coatings. X-ray diffraction (XRD) was employed to investigate the texture and crystal phase of the materials while scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) were utilized to assess the surface and cross-section structure. Additionally, electrochemical techniques were employed to evaluate the corrosion performance. Compared to DC electroplating, the corrosion potential of pulsed galvanized ferroalloy alloy coating increased from −1031 mV to −1008 mV, and the corrosion current density decreased from 3.122 × 10−5 A∙cm−2 to 0.321 × 10−5 A∙cm−2. Moreover, the corrosion rate value of the coating obtained by the pulse rectifier (0.386 × 10−5 g m−2 h−1) was lower than that obtained by the DC power supply (3.75 × 10−5 g m−2 h−1). Additionally, pulsed electrodeposition reduced the iron content of the coating by 0.7%, thereby enhancing its corrosion resistance and flatness. The impedance parameters of the zinc–iron alloy coating acquired through the 30% duty cycle monopulser process exhibit superior performance compared to DC electroplating. Evidently, the monopulse coating’s structure enhances crystal packing density, augments coating thickness, improves adhesion to the substrate interface, and optimizes grain distribution uniformity. These factors are crucial determinants of the corrosion behavior exhibited by Ze–Fe coating. Full article
(This article belongs to the Special Issue Advanced Corrosion Protection through Coatings and Surface Rebuilding)
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16 pages, 2886 KiB  
Article
Optimizing Experimental Immersion Protocol for SEBS Coating Formation on Copper Surfaces Using Response Surface Methodology
by Fatma Masmoudi, Abdulrahman Mallah and Mohamed Masmoudi
Coatings 2023, 13(10), 1734; https://doi.org/10.3390/coatings13101734 - 5 Oct 2023
Cited by 1 | Viewed by 1078
Abstract
Polystyrene-block-poly (ethylene-ran-butylene)-block-polystyrene (SEBS) was successfully deposited on the copper surface with an optimal condition of immersion protocol. Response surface methodology (RSM), particularly Box–Behnken Design (BBD), was used to study the combination of three environmental factors that minimize corrosion rate (CR), evaluated by voltammetry [...] Read more.
Polystyrene-block-poly (ethylene-ran-butylene)-block-polystyrene (SEBS) was successfully deposited on the copper surface with an optimal condition of immersion protocol. Response surface methodology (RSM), particularly Box–Behnken Design (BBD), was used to study the combination of three environmental factors that minimize corrosion rate (CR), evaluated by voltammetry around the open circuit potential (OCP). The BBD analysis calculates the contribution value of each parameter in changing the value of the CR in both individual and synergistic cases. The optimized parameters were found to be 2.17% of SEBS ratio, 20 min of immersion time 1, and 21 min of immersion time 2. The empirical model result was confirmed by studying the electrochemical behavior of the SEBS coating on copper under optimal conditions (Cu-SEBS-Opt-Cond) exposed in a 3 wt% NaCl solution. Full article
(This article belongs to the Special Issue Advanced Corrosion Protection through Coatings and Surface Rebuilding)
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14 pages, 5629 KiB  
Article
Hot Corrosion Behavior of Single-Layered Gd2Zr2O7, Sm2Zr2O7, and Nd2Zr2O7 Thermal Barrier Coatings Exposed to Na2SO4 + MgSO4 Environment
by Muhammad Jahangir Khan, Grzegorz Moskal, Amjad Iqbal, Marta Mikuśkiewicz, Tomasz Pawlik and Piotr Olesik
Coatings 2023, 13(8), 1311; https://doi.org/10.3390/coatings13081311 - 26 Jul 2023
Cited by 2 | Viewed by 1265
Abstract
Zirconates of rare earth elements have emerged as promising candidates for thermal barrier coatings (TBC). This study investigates the hot corrosion resistance of single-layered ceramic coatings composed of Gd2Zr2O7, Sm2Zr2O7, and [...] Read more.
Zirconates of rare earth elements have emerged as promising candidates for thermal barrier coatings (TBC). This study investigates the hot corrosion resistance of single-layered ceramic coatings composed of Gd2Zr2O7, Sm2Zr2O7, and Nd2Zr2O7. The coatings were prepared using air plasma spraying and applied to an Inconel [IN] 625 substrate. Experimental assessments were conducted to examine the hot corrosion behaviour by subjecting the coatings to pure magnesium sulfate (MgSO4) salt at 1000 °C for 24 h and a 50/50 mole percent Na2SO4 and MgSO4 mixture at 900 °C for cyclic durations of 5, 10, 15, and 20 h. This combination of salts creates a highly corrosive environment. This short test was carried out due to the necessity of the initial stages of the destruction process characterization. X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersion spectroscopy (EDS) techniques were utilized to identify and analyse the reaction products. At 1000 °C, no chemical reaction products were observed between MgSO4 and Gd2Zr2O7, Sm2Zr2O7, and Nd2Zr2O7. However, in the presence of the MgSO4 + Na2SO4 mixture, the zirconate coatings reacted, resulting in the formation of reaction products such as Gd(SO4)3, Gd2O2SO4, Gd2O3, Sm2O2SO4, Sm2(SO4)3, Sm2O3, MgO, Nd2(SO4)3, Na2O, and m-ZrO2. These compounds are formed due to the interaction of rare earth oxides with a low-temperature-melting eutectic Na2SO4+ (3MgSO4 × Na2SO4) melted at 666 °C. Despite the aggressive nature of the corrosive environment, the decomposition of rare earth zirconates was relatively limited, indicating satisfactory resistance to hot corrosion. Among the zirconate systems studied, Gd2Zr2O7 exhibited the lowest resistance to the MgSO4 + Na2SO4-based corrosive environment, while Sm2Zr2O7 and Nd2Zr2O7 demonstrated better corrosion resistance. Full article
(This article belongs to the Special Issue Advanced Corrosion Protection through Coatings and Surface Rebuilding)
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16 pages, 4727 KiB  
Article
Influence of Cr Nanoparticles on Plasma Electrolytic Oxidation Coatings on AM50 Mg Alloy
by Wenze Lv, Xiaopeng Lu, Qianqian Chen, Jirui Ma, Sergey A. Karpushenkov, Oleg V. Ignatenko and Fuhui Wang
Coatings 2023, 13(7), 1196; https://doi.org/10.3390/coatings13071196 - 3 Jul 2023
Cited by 4 | Viewed by 1364
Abstract
The addition of Cr nanoparticles to a plasma electrolytic oxidation (PEO) electrolyte offers the possibility of producing layers with a broader range of coating compositions and improved properties. In this study, the effects of nanoparticles and various voltages on coating formation, microscopic morphology, [...] Read more.
The addition of Cr nanoparticles to a plasma electrolytic oxidation (PEO) electrolyte offers the possibility of producing layers with a broader range of coating compositions and improved properties. In this study, the effects of nanoparticles and various voltages on coating formation, microscopic morphology, and phase composition were investigated with in situ incorporation of Cr nanoparticles into PEO-coated Mg alloy. The results show that the corrosion performance of the coating was significantly improved when the final voltage was set to 460 V and the concentration of Cr nanoparticles was 1 g/L. Compared to the particle-free coating, the corrosion current density of the coating with the addition of 1 g/L Cr nanoparticles was reduced by two orders of magnitude. The impedance at the low frequency (0.01 Hz) increased by more than one order of magnitude after one hour of immersion, indicating a considerable improvement in corrosion resistance. Due to the high temperature during the coating-formation process, the Cr nanoparticles were oxidized, resulting in the formation of Cr2O3. The existence of Cr2O3 slightly increased the growth rate of the coating and sealed the open pores of the coating. Full article
(This article belongs to the Special Issue Advanced Corrosion Protection through Coatings and Surface Rebuilding)
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12 pages, 3183 KiB  
Article
Inhibition of Surface Corrosion Behavior of Zinc-Iron Alloy by Silicate Passivation
by Fan Cao, Peng Cao, Yangyang Li, Yi Wang, Lei Shi and Di Wu
Coatings 2023, 13(6), 1057; https://doi.org/10.3390/coatings13061057 - 7 Jun 2023
Cited by 1 | Viewed by 1585
Abstract
The passivation of zinc alloy coating was achieved through the utilization of both silicate and trivalent chromium passivation systems, employing a specific process formula consisting of Co(NO3)2 at a concentration of 2.5 g/L, C76H52O46 at [...] Read more.
The passivation of zinc alloy coating was achieved through the utilization of both silicate and trivalent chromium passivation systems, employing a specific process formula consisting of Co(NO3)2 at a concentration of 2.5 g/L, C76H52O46 at 3 mL/L, Na2SiO3 at 25 g/L, C6H5Na3O7 at 15 g/L, and an appropriate amount of organic accelerator. The composite passivation of silicate and tannic acid was found to be more effective than the trivalent chromium passivation film, as it successfully eliminated the dendrite structure on the coating surface and reduced surface defects. The coordination between negatively charged SiO2− or SiO2 micelles and Zn2+ results in the formation of a passivation film that exhibits lower corrosion current and higher corrosion potential compared to the trivalent chromium passivation film. Additionally, the impedance test fitting results indicate that the silicate passivation film possesses a higher resistance value. Overall, the proposed silicate passivation system presents a viable alternative to the toxic chromate passivation system, offering non-toxicity and superior protective performance relative to the trivalent chromium passivation system. Full article
(This article belongs to the Special Issue Advanced Corrosion Protection through Coatings and Surface Rebuilding)
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25 pages, 7634 KiB  
Article
Optimization and Characterization of Centrifugal-Cast Functionally Graded Al-SiC Composite Using Response Surface Methodology and Grey Relational Analysis
by Bassiouny Saleh, Reham Fathi, Modawy Adam Ali Abdalla, N. Radhika, Aibin Ma and Jinghua Jiang
Coatings 2023, 13(5), 813; https://doi.org/10.3390/coatings13050813 - 22 Apr 2023
Cited by 9 | Viewed by 1975
Abstract
In this study, an optimization approach was employed to determine the optimal main parameters that improve the performance of functionally graded composites manufactured using a combination of stirring and horizontal centrifugal casting. Pure aluminum reinforced with silicon carbide particles was used as the [...] Read more.
In this study, an optimization approach was employed to determine the optimal main parameters that improve the performance of functionally graded composites manufactured using a combination of stirring and horizontal centrifugal casting. Pure aluminum reinforced with silicon carbide particles was used as the material for the composites. The effects of key input parameters such as mold speed, pouring temperature, stirring speed, and radial distance were optimized using a combination of grey relational analysis and response surface methodology. The statistical significance of the predicted grey relational grade model was assessed through an analysis of variance to identify the appropriate main parameters. The results showed that radial distance had the greatest impact on the performance of the composites, followed by pouring temperature. The optimal combination of main parameters was determined to be a mold speed of 1000 rpm, a pouring temperature of 750 °C, a stirring speed of 150 rpm, and a radial distance of 1 mm. Confirmation tests using these optimal values resulted in a 54.69% improvement in the grey relational grade. Full article
(This article belongs to the Special Issue Advanced Corrosion Protection through Coatings and Surface Rebuilding)
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17 pages, 8727 KiB  
Article
Corrosion Behaviors of Tetrasodium Iminodisuccinate (IDS) as an Environmentally Friendly Inhibitor: Experimental and Theoretical Studies
by Shaopeng Fu, Xingyao Yang, Yichun Peng, Qi Wang, Qinghao Sun, Junwei Zhang, Xinping Wang, Zezhou Liang and Jianfeng Li
Coatings 2023, 13(3), 613; https://doi.org/10.3390/coatings13030613 - 14 Mar 2023
Cited by 7 | Viewed by 1955
Abstract
An environmentally friendly chelating agent, tetrasodium iminodisuccinate (IDS), was investigated as an inhibitor in the simulated concrete pore solution on Q235 carbon steel by using Tafel polarization (TF), electrochemical impedance spectroscopy (EIS) and surface morphology tests. The EIS and TF results indicate that [...] Read more.
An environmentally friendly chelating agent, tetrasodium iminodisuccinate (IDS), was investigated as an inhibitor in the simulated concrete pore solution on Q235 carbon steel by using Tafel polarization (TF), electrochemical impedance spectroscopy (EIS) and surface morphology tests. The EIS and TF results indicate that the IDS is a mixed type of inhibitor and exhibits excellent protection efficiency (97.54%) at 200 mg/L. Furthermore, based on the Langmuir adsorption isotherm, IDS protects carbon steel through physical and chemical adsorption. Besides, density functional theory (DFT) and molecular dynamics (MD) simulations are applied to explore the inhibition mechanism to support the experimental data, indicating that IDS can be used as a new green corrosion inhibitor. Full article
(This article belongs to the Special Issue Advanced Corrosion Protection through Coatings and Surface Rebuilding)
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19 pages, 9386 KiB  
Article
Functionally Gradient Coatings from HfC/ HfTaC2 to Ti: Growth Process, Basic Mechanical Properties and Wear Behavior
by Jingli Li, Qiang Miao, Wenping Liang, Ruixiang Liu, Hui Zhao, Jingjia Sun, Jing Zhang, Kai Zang, Jianyan Xu, Wei Yao, Xiaoma Tao and Mingguang Liu
Coatings 2022, 12(12), 1941; https://doi.org/10.3390/coatings12121941 - 9 Dec 2022
Cited by 1 | Viewed by 1733
Abstract
HfC and HfTaC2 coatings with gradient composition manufactured by double-cathode glow discharge plasma surface metallurgy technology were designed to improve the wear resistance of TA15 titanium alloy. The deposition mechanism of plasma and diffusion mechanism of atoms were investigated, and the growth [...] Read more.
HfC and HfTaC2 coatings with gradient composition manufactured by double-cathode glow discharge plasma surface metallurgy technology were designed to improve the wear resistance of TA15 titanium alloy. The deposition mechanism of plasma and diffusion mechanism of atoms were investigated, and the growth process of coatings was revealed. The mechanical properties comprising microhardness and elastic modulus were investigated via first-principles calculations and experimental verification. The results reveal that the wear resistance of HfC and HfTaC2 coatings with abrasive wear mechanism is always better than that of the substrate with abrasive wear, adhesive wear and oxidation wear mechanism. The volume wear rates of the coatings are reduced by 90%–97% compared with the substrate, and that of HfTaC2 coatings are reduced by 29.9%–45.5% compared with HfC coatings. Furthermore, V-shaped cross section profiles of wear scars formed on HfC coatings, and U-shaped on HfTaC2 coatings, which is attributed to the addition of tantalum which causes HfC to form a sufficient solid solution, a 0.187–0.030 Å elongation of Ta-C bond length and 0.039–0.051 Å shortening of Hf-C bond length led to the unit cell shrinkage and the Bragg lattice changes from face-centered cubic to face-centered square lattice; accordingly, hardness and wear behavior were further improved. Full article
(This article belongs to the Special Issue Advanced Corrosion Protection through Coatings and Surface Rebuilding)
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Graphical abstract

22 pages, 8345 KiB  
Article
Synthesis, Characterization and Investigation of Anticorrosion Properties of an Innovative Metal–Organic Framework, ZnMOF-BTA, on Carbon Steel in HCl Solution
by Izuchukwu K. Nwokolo, Hongwei Shi, Alexander I. Ikeuba, Ningjie Gao, Jiwen Li, Sharjeel Ahmed and Fuchun Liu
Coatings 2022, 12(9), 1288; https://doi.org/10.3390/coatings12091288 - 2 Sep 2022
Cited by 29 | Viewed by 2404
Abstract
An innovative metal–organic framework (ZnMOF-BTA) with corrosion inhibition properties was prepared by the solvothermal reaction of zinc nitrate, 1,2,3-benzotriazole, and 2,5-thiophene dicarboxylic acid. ZnMOF-BTA was characterized by FTIR, XRD, XPS, SEM, and thermogravimetric analyses, and the corrosion inhibition performance on Q235 carbon steel [...] Read more.
An innovative metal–organic framework (ZnMOF-BTA) with corrosion inhibition properties was prepared by the solvothermal reaction of zinc nitrate, 1,2,3-benzotriazole, and 2,5-thiophene dicarboxylic acid. ZnMOF-BTA was characterized by FTIR, XRD, XPS, SEM, and thermogravimetric analyses, and the corrosion inhibition performance on Q235 carbon steel in 1 M HCl solution was evaluated by weight loss, polarization, and EIS measurements. XRD results showed that ZnMOF-BTA has a monoclinic crystal structure and belongs to C12/c1 space group, while DTA/TGA results revealed it has a good crystalline quality and excellent thermal stability with a melting point of 410 °C. FTIR and XPS results revealed that Zn2+, TDC2−, and BTA molecules were successfully used in ZnMOF-BTA synthesis. Electrochemical test results show that the obtained ZnMOF-BTA is effective in corrosion inhibition of Q235 carbon steel in acidic conditions and maximum inhibition efficiency of over 90% is obtained at 6 wt.% ZnMOF-BTA extract concentration. Adsorption studies revealed that the adsorption of BTA molecules follows the Langmuir isotherm model with an R2 value of 0.97889, while the ΔG◦ads value of −10.28 kJ mol−1 indicates that adsorption is by physisorption. The study provides a new corrosion inhibitor compound with proven corrosion inhibition properties. Full article
(This article belongs to the Special Issue Advanced Corrosion Protection through Coatings and Surface Rebuilding)
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Review

Jump to: Editorial, Research

18 pages, 4515 KiB  
Review
Progress in the Graphene Oxide-Based Composite Coatings for Anticorrosion of Metal Materials
by Shuo Tang, Bing Lei, Zhiyuan Feng, Honglei Guo, Ping Zhang and Guozhe Meng
Coatings 2023, 13(6), 1120; https://doi.org/10.3390/coatings13061120 - 18 Jun 2023
Cited by 7 | Viewed by 3452
Abstract
Graphene oxide (GO), derived from the two-dimensional nanosheet graphene, has received unprecedented attention in the field of metal corrosion protection owing to its excellent barrier performance and various active functional groups. In this review, the protection mechanism “labyrinth effect” of composite coatings against [...] Read more.
Graphene oxide (GO), derived from the two-dimensional nanosheet graphene, has received unprecedented attention in the field of metal corrosion protection owing to its excellent barrier performance and various active functional groups. In this review, the protection mechanism “labyrinth effect” of composite coatings against metal corrosion was demonstrated systematically. The origination, structure and properties of GO were also analyzed. Their poor dispersion in polymer and tendency to aggregate as nanofillers in composite coatings are the main limitations during application of the coating fillers. In addition, a comprehensive overview on the perspectives of the surface modification of GO and the multi-functionalization of the composite coatings based on GO were given in particular. Green modification methods, reasonable arrangement of GO sheets in composites and development of multi-functional coatings remain challenges in current studies and should be a focus in the future development of GO-based anticorrosive coatings. This review is of value to researchers interested in the design and application of GO in corrosion protection coatings. Full article
(This article belongs to the Special Issue Advanced Corrosion Protection through Coatings and Surface Rebuilding)
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