scholarly journals Influence of SiO2 Particles on the Corrosion and Wear Resistance of Plasma Electrolytic Oxidation-Coated AM50 Mg Alloy

Coatings ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 306 ◽  
Author(s):  
Xiaopeng Lu ◽  
Yan Chen ◽  
Carsten Blawert ◽  
Yan Li ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Phase Composition ◽  
Coating Thickness ◽  
Plasma Electrolytic Oxidation ◽  
Corrosion And Wear ◽  
Initial Stage ◽  
Electrolytic Oxidation ◽  
Sio2 Particles ◽  
Plasma Electrolytic ◽  
Peo Coatings

The influence of SiO2 particles on the microstructure, phase composition, corrosion and wear performance of plasma electrolytic oxidation (PEO) coatings on AM50 Mg was investigated. Different treatment durations were applied to fabricate coatings in an alkaline, phosphate-based electrolyte (1 g/L KOH + 20 g/L Na3PO4 + 5 g/L SiO2), aiming to control the incorporated amount of SiO2 particles in the layer. It was found that the uptake of particles was accompanied by the coating growth at the initial stage, while the particle content remained unchanged at the final stage, which is dissimilar to the evolution of the coating thickness. The incorporation mode of the particles and phase composition of the layer was not affected by the treatment duration under the voltage-control regime. The corrosion performance of the coating mainly depends on the barrier property of the inner layer, while wear resistance primarily relies on the coating thickness.

scholarly journals Plasma Electrolytic Oxidation Ceramic Coatings on Zirconium (Zr) and Zr-Alloys: Part-II: Properties and Applications

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 620
Author(s):  
Navid Attarzadeh ◽  
C. V. Ramana
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Ceramic Coatings ◽  
Corrosion And Wear ◽  
Properties Of Coatings ◽  
Research Areas ◽  
Wear Protection ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Corrosive Environments ◽  
Peo Coatings

A plasma electrolytic oxidation (PEO) is an electrochemical and eco-friendly process where the surface features of the metal substrate are changed remarkably by electrochemical reactions accompanied by plasma micro-discharges. A stiff, adhesive, and conformal oxide layer on the Zr and Zr-alloy substrates can be formed by applying the PEO process. The review describes recent progress on various applications and functionality of PEO coatings in light of increasing industrial, medical, and optoelectronic demands for the production of advanced coatings. Besides, it explains how the PEO coating can address concerns about employing protective and long-lasting coatings with a remarkable biocompatibility and a broad excitation and absorption range of photoluminescence. A general overview of the process parameters of coatings is provided, accompanied by some information related to the biological conditions, under which, coatings are expected to function. The focus is to explain how the biocompatibility of coatings can be improved by tailoring the coating process. After that, corrosion and wear performance of PEO coatings are described in light of recognizing parameters that lead to the formation of coatings with outstanding performance in extreme loading conditions and corrosive environments. Finally, a future outlook and suggested research areas are outlined. The emerging applications derived from paramount features of the coating are considered in light of practical properties of coatings in areas including biocompatibility and bioactivity, corrosion and wear protection, and photoluminescence of coatings

scholarly journals Preparation of Wear-Resistant Coating on Ti6Al4V Alloy by Cold Spraying and Plasma Electrolytic Oxidation

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1288
Author(s):  
Mingzeng Shao ◽  
Wei Wang ◽  
Hongbo Yang ◽  
Xueer Zhang ◽  
Xiaomei He
Keyword(s):  
Wear Resistance ◽  
Plasma Electrolytic Oxidation ◽  
Cold Spraying ◽  
Ti6al4v Alloy ◽  
Wear Resistant ◽  
Ti6al4v Substrate ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Α Al2o3 ◽  
Peo Coatings

In order to improve the wear resistance of Ti6Al4V alloy, the alloy was first coated with alumina-reinforced aluminum coating (CS-coating) by cold spraying, and then the alloy with CS-coating was processed by plasma electrolytic oxidation (PEO) under unipolar mode and soft sparking mode, respectively, to prepare wear-resistant PEO coatings. For comparison, Ti6Al4V alloy without CS-coating was also subjected to PEO treatment. The microstructure, phase composition, hardness, and wear resistance of the PEO coatings formed on Ti6Al4V alloy with and without CS-coating were investigated. The results revealed that PEO coatings formed on Ti6Al4V alloy with CS-coating under soft sparking mode contained more α-Al2O3, possessed larger thickness, more compact microstructure, and higher microhardness than that formed under unipolar mode. The PEO coating formed on Ti6Al4V substrate was mainly composed of TiO2 and had pores and cracks. Among all these coatings, PEO coating formed on Ti6Al4V alloy with CS-coating under soft sparking mode exhibited the best wear resistance with a wear rate of 1.18 × 10−5 mm3/(Nm), which was only 15.28% of that of the Ti6Al4V substrate. The investigation indicated that the combination of cold spraying and PEO under soft sparking mode is a promising technique for improving the wear resistance of titanium alloy.

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