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Metals
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Corrosion and Surface Modification of Metallic Materials
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Corrosion and Surface Modification of Metallic Materials

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Corrosion and Protection".

Deadline for manuscript submissions: closed (31 August 2022) | Viewed by 8544

Special Issue Editor

Prof. Dr. Willian Aperador

E-Mail Website
Guest Editor
Department of Engineering, Universidad Militar Nueva Granada, Carrera 11 No. 101-80, Bogota 6343200, Colombia
Interests: corrosion; wear; thin films
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Metallic materials are those materials most used on a daily basis and at the engineering level due to their versatility, resistance, and easy recyclability. One of the examples that shows these characteristics is steel, mainly used in various applications and environments to withstand extreme conditions such as weight support and temperature. Likewise, most industrial processes involve materials making contact with different types of fluids. This is how the parts exposed to the action of these fluids can present oxidation, thus rapidly reducing the usefulness of the pieces. Due to the relative movement of a corrosive fluid in contact with the metallic surface, the iron rust added to mechanical effects accelerates the corrosion rate of the metal. Additionally, if the fluid contains solids and suspended particles, the degradation effects on the material increase. As such, in recent years, advancements worldwide have made it possible to generate coatings that improve the properties of metals or maintain the integrity of the material under the effects of an aggressive medium that causes corrosion. This allows coatings to become the solution to this problem that impacts great economic losses worldwide.

Prof. Dr. Willian Aperador
Guest Editor

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. Metals 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

  • metals
  • corrosion
  • hard coatings
  • physical vapor deposition
  • tribometers
  • fretting corrosion
  • potentiodynamic polarization

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Published Papers (4 papers)

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Research

14 pages, 3132 KiB  
Article
High-Temperature Corrosion Behavior of Bi3.75La0.25Ti3O12 and Bi3La1Ti3O12 Coating Prepared by rf Magnetron Sputtering
by Jorge Bautista-Ruiz, Jorge Sánchez-Molina and Willian Aperador
Metals 2022, 12(10), 1585; https://doi.org/10.3390/met12101585 - 23 Sep 2022
Viewed by 1303
Abstract
Using the rf magnetron sputtering technique, Bi3.75La0.25Ti3O12 and Bi3La1Ti3O12 coatings were formed and obtained as a thin film on Hastelloy substrates. When subjected to high-temperature conditions, the effect of [...] Read more.
Using the rf magnetron sputtering technique, Bi3.75La0.25Ti3O12 and Bi3La1Ti3O12 coatings were formed and obtained as a thin film on Hastelloy substrates. When subjected to high-temperature conditions, the effect of lanthanum on the anti-corrosive properties of the coatings was investigated. The anti-corrosive response was evaluated by electrochemical impedance spectroscopy and potentiodynamic curves, which are rarely reported. Hot corrosion occurs through the electrochemical mechanism, and more information can be obtained through electrochemical corrosion tests, which are very effective and fast. The electrochemical behavior at high temperatures was studied via molten salt corrosion tests, potentiodynamic polarization curves, and electrochemical impedance spectroscopy. Additionally, the coatings were evaluated via scanning electron microscopy and transmission microscopy to determine their morphology. With X-ray diffraction, the crystallinity of the films was determined. It was determined that the corrosion rate directly correlates with the temperature, attributed to the mechanisms induced by the Na2SO4 and V2O5 salts that generated condensation. As the temperature increases, the density of the corrosion current increases in the thin films of Bi3.75La0.25Ti3O12 and Bi3La1Ti3O12. When comparing the two compounds, it is determined that the increase in lanthanum alters the positive acid character, thus reducing the dissolution of the oxides and increasing protection. Full article
(This article belongs to the Special Issue Corrosion and Surface Modification of Metallic Materials)
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18 pages, 6770 KiB  
Article
Comparative Study on the Corro-Erosive Properties of Base Cemented Transition Metals TaC and HfC and TaX-HfX-C Coatings
by C. H. Ortiz, S. S. Sanchez, J. C. Caicedo, W. Aperador, Jorge Sánchez-Molina and J. Bautista Ruiz
Metals 2022, 12(9), 1516; https://doi.org/10.3390/met12091516 - 14 Sep 2022
Cited by 1 | Viewed by 1958
Abstract
In this research, we report on a comparative study of the corro-erosive properties of TaC and HfC individual coatings and (Ta70-Hf30-C) and (Ta30-Hf70-C) coatings. These were subjected to different impact angles of abrasive particles, corresponding [...] Read more.
In this research, we report on a comparative study of the corro-erosive properties of TaC and HfC individual coatings and (Ta70-Hf30-C) and (Ta30-Hf70-C) coatings. These were subjected to different impact angles of abrasive particles, corresponding with angles of 30°, 60° and 90°. It was determined that at 90°, a higher structural damage of the coatings obtained was presented. In addition, for all the systems, it was possible to conclude that the coating formed by (Ta30-Hf70-C) presented a roughness of approximately 7.11 nm, which influenced corrosive properties such as the corrosion potential and corrosion rate. Finally, it was possible to conclude that the (Ta30-Hf70-C) coating presented a higher resistance against corro-erosive environments. This was attributed to structural and mainly superficial factors, making this coating the best option to be implemented as a protective coating against highly aggressive environments in industry. Full article
(This article belongs to the Special Issue Corrosion and Surface Modification of Metallic Materials)
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14 pages, 3254 KiB  
Article
Influence of Deposition Parameters on Structural and Electrochemical Properties of Ti/Ti2N Films Deposited by RF-Magnetron Sputtering
by Andrés González-Hernández, William Aperador, Martín Flores, Edgar Onofre-Bustamante, Juan E. Bermea, Roberto Bautista-García and Federico Gamboa-Soto
Metals 2022, 12(8), 1237; https://doi.org/10.3390/met12081237 - 22 Jul 2022
Cited by 5 | Viewed by 1984
Abstract
The titanium nitride (Ti2N) films have good mechanical properties, such as high hardness and chemical stability, giving Ti2N good resistance to wear and corrosion. The properties of films deposited by PVD techniques are determined by their structure, microstructure, composition, [...] Read more.
The titanium nitride (Ti2N) films have good mechanical properties, such as high hardness and chemical stability, giving Ti2N good resistance to wear and corrosion. The properties of films deposited by PVD techniques are determined by their structure, microstructure, composition, and morphology that depend on the deposition parameters, such as substrate temperature, vacuum pressure, and the distance between the target and the substrate. The influence of these parameters has been studied individually. This work studied the structure, morphology, composition, and electrochemical behavior of Ti/Ti2N films deposited by RF-magnetron sputtering on carbon steel, such as a function of the power of the RF source, substrate temperature, and the target to substrate distance and the Ar/N2 ratio. The film structure was analyzed by X-ray diffraction (XRD), the morphology of cross-section by SEM, the semi-quantitative composition by EDS, and the electrochemical properties was studied by open circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy techniques. The films showed two phases of Ti and Ti2N. The SEM-EDS exhibited a morphology according to the Stranski–Krastanov or layer-plus-island growth model. The substrate temperature of 450 °C strongly influences the electrochemical properties. Full article
(This article belongs to the Special Issue Corrosion and Surface Modification of Metallic Materials)
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17 pages, 8169 KiB  
Article
Corrosion Nature in [CoN/AlN]n Multilayers Obtained from Laser Ablation
by Julio Caicedo, Neufer Bonilla and Willian Aperador
Metals 2021, 11(12), 2049; https://doi.org/10.3390/met11122049 - 17 Dec 2021
Cited by 2 | Viewed by 2256
Abstract
The aim of this work is the improvement of the electrochemical behavior of industrial steel using [CoN/AlN]n multilayered system via reactive Pulsed Laser Deposition (PLD) technique with a Nd: YAG laser (λ = 1064 nm) on Silicon (100) and AISI 302 steel substrates. [...] Read more.
The aim of this work is the improvement of the electrochemical behavior of industrial steel using [CoN/AlN]n multilayered system via reactive Pulsed Laser Deposition (PLD) technique with a Nd: YAG laser (λ = 1064 nm) on Silicon (100) and AISI 302 steel substrates. In this work was varied systematically the bilayer period (Λ) and the coatings were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and the chemical composition was determined by means of X-ray photoelectron spectroscopy (XPS). The maximum corrosion resistance for the coating with (Λ) equal to 34.7 nm, corresponding to n = 30 bilayered. The polarization resistance and corrosion rate were around 7.62 × 105 kOhm × cm2 and 7.25 × 10−5 mm/year, these values were 6.3 × 105 and 78.6 times better than those showed by the uncoated 302 stainless steel substrate (1.2 kOhm × cm2 and 0.0057 mm/year), respectively. The improvement of the electrochemical behavior of the steel 302 coated with this [CoN/AlN]n can be attributed to the presence of several interfaces that act as obstacles for the inward and outward diffusions of Cl− ions, generating an increment in the corrosion resistance. The electrochemical results found in the [CoN/AlN]n open a possibility of future applications in mechanical devices that require high demands in service conditions. Full article
(This article belongs to the Special Issue Corrosion and Surface Modification of Metallic Materials)
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