Plasma Treatment on Alloys' Surface

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (31 January 2021) | Viewed by 7547

Special Issue Editors


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Guest Editor
Laboratorio de Innovación en Plasmas, Edificio Einstein (C2), Campus de RabanalesUniversidad de CórdobaCórdobaSpain
Interests: Surface Treatment of Plasma Materials; Synthesis of Materials by Plasmas; Spectroscopic Plasma Diagnosis; Thermodynamic Balance in Plasmas

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Guest Editor
Laboratorio de Innovación en Plasmas, Edificio Einstein (C2), Campus de Rabanales, Universidad de CórdobaCórdoba, Spain
Interests: Synthesis of Materials by Plasmas; Thin Film Deposition by Atmospheric-Pressure Plasmas; Thin Film Characterization; Spectroscopic Plasma Diagnosis;

Special Issue Information

Dear Colleagues,

Plasmas are very reactive environments containing highly energetic species that allows for reactions that would otherwise be impossible or very inefficient. Due to their operational flexibility in terms of working pressure, gas composition, electromagnetic frequency, or reactor configuration, plasmas have been used for many technological applications, including the treatment of metal alloys.

Besides early applications—i.e.: plasma welding and cutting—developed during the 50s and 60s, scientific and technological advances during the subsequent decades has allowed for a more precise use of plasmas acting only on the surface of the metallic materials, including etching, cleaning, synthesis of metallic nanoparticles, thick- and thin- film deposition of coatings and general modification of both physical and chemical properties of the materials.

In this Special Issue of Metals, devoted to the Plasma Treatment on Alloys’ Surfaces researchers are invited to submit regular papers, short communications, and review articles, featuring their contributions in this field, ranging from early-stage developments to full scale-up applications, comprising the use of plasmas for processing metals and alloys.

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

  • Plasma metallurgy
  • Plasma cutting and welding
  • Plasma etching and sputtering
  • Plasma spray and/or thin-film deposition
  • Plasma surface cleaning and/or activation
  • Other physicochemical modifications (e.g., sterilization, nanoparticle synthesis, and/or deposition…)

Prof. José Muñoz
Prof. Rocío Rincón
Guest Editors

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Keywords

  • Plasma
  • Metallurgy
  • Welding
  • Etching
  • Sputtering
  • Plasma spray
  • Thin-film deposition
  • Surface cleaning
  • Surface activation
  • Surface modification

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Published Papers (2 papers)

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Research

15 pages, 5700 KiB  
Article
Phase Transformation-Induced Improvement in Hardness and High-Temperature Wear Resistance of Plasma-Sprayed and Remelted NiCrBSi/WC Coatings
by Jin Sha, Liang-Yu Chen, Yi-Tong Liu, Zeng-Jian Yao, Sheng Lu, Ze-Xin Wang, Qian-Hao Zang, Shu-Hua Mao and Lai-Chang Zhang
Metals 2020, 10(12), 1688; https://doi.org/10.3390/met10121688 - 17 Dec 2020
Cited by 28 | Viewed by 3164
Abstract
The remelting method is introduced to improve the properties of the as-sprayed NiCrBSi coatings. In this work, tungsten carbide (WC) was selected as reinforcement and the as-sprayed and remelted NiCrBSi/WC composite coatings were investigated by X-ray diffraction, scanning electron microscopy, hardness test and [...] Read more.
The remelting method is introduced to improve the properties of the as-sprayed NiCrBSi coatings. In this work, tungsten carbide (WC) was selected as reinforcement and the as-sprayed and remelted NiCrBSi/WC composite coatings were investigated by X-ray diffraction, scanning electron microscopy, hardness test and tribology test. After spraying, WC particles are evenly distributed in the coating. The remelting process induced the decarburizing reaction of WC, resulting in the formation of dispersed W2C. The dispersed W2C particles play an important role in the dispersion strengthening. Meanwhile, the pores and lamellar structures are eliminated in the remelted NiCrBSi/WC composite coating. Due to these two advantages, the hardness and the high-temperature wear resistance of the remelted NiCrBSi/WC composite coating are significantly improved compared with those with an as-sprayed NiCrBSi coating; the as-sprayed NiCrBSi coating, as-sprayed NiCrBSi/WC composite coating and remelted NiCrBSi/WC composite coating have average hardness of 673.82, 785.14, 1061.23 HV, and their friction coefficients are 0.3418, 0.3261, 0.2431, respectively. The wear volume of the remelted NiCrBSi/WC composite coating is only one-third of that of the as-sprayed NiCrBSi coating. Full article
(This article belongs to the Special Issue Plasma Treatment on Alloys' Surface)
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21 pages, 8392 KiB  
Article
Effects of Processing Parameters on the Corrosion Performance of Plasma Electrolytic Oxidation Grown Oxide on Commercially Pure Aluminum
by Getinet Asrat Mengesha, Jinn P. Chu, Bih-Show Lou and Jyh-Wei Lee
Metals 2020, 10(3), 394; https://doi.org/10.3390/met10030394 - 19 Mar 2020
Cited by 18 | Viewed by 3799
Abstract
The plasma electrolyte oxidation (PEO) process has been considered an environmentally friendly surface engineering method for improving the corrosion resistance of light weight metals. In this work, the corrosion resistance of commercially pure Al and PEO treated Al substrates were studied. The PEO [...] Read more.
The plasma electrolyte oxidation (PEO) process has been considered an environmentally friendly surface engineering method for improving the corrosion resistance of light weight metals. In this work, the corrosion resistance of commercially pure Al and PEO treated Al substrates were studied. The PEO layers were grown on commercially pure aluminum substrates using two different alkaline electrolytes with different addition concentrations of Si3N4 nanoparticles (0, 0.5 and 1.5 gL−1) and different duty cycles (25%, 50%, and 80%) at a fixed frequency. The corrosion properties of PEO coatings were investigated by the potentiodynamic polarization and electrochemical impedance spectroscopy test in 3.5 wt.% NaCl solutions. It showed that the weight gains, layer thickness and surface roughness of the PEO grown oxide layer increased with increasing concentrations of Si3N4 nanoparticles. The layer thickness, surface roughness, pore size, and porosity of the PEO oxide layer decreased with decreasing duty cycle. The layer thickness and weight gain of PEO coating followed a linear relationship. The PEO layer grown using the Na2B4O7∙10H2O contained electrolyte showed an excellent corrosion resistance and low surface roughness than other PEO coatings with Si3N4 nanoparticle additives. It is noticed that the corrosion performance of PEO coatings were not improved by the addition of Si3N4 nanoparticle in the electrolytic solutions, possibly due to its detrimental effect to the formation of a dense microstructure. Full article
(This article belongs to the Special Issue Plasma Treatment on Alloys' Surface)
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