Microstructure, corrosion and wear performance of plasma electrolytic oxidation coatings formed on Ti–6Al–4V alloy in silicate-hexametaphosphate electrolyte

Coatings have been produced on Ti–6Al–4V alloy by plasma electrolytic oxidation (PEO) using an aqueous solution of Na2SiO3 and (NaPO3)6 with a pulsed electrical regime. The kinetics of coating growth revealed a relatively rapid initial rate, which then slowed significantly as the coating thickened....

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Bibliographic Details
Published in:Surface & coatings technology 2013-02, Vol.217, p.129-139
Main Authors: Cheng, Ying-liang, Wu, Xiang-Quan, Xue, Zhi-gang, Matykina, E., Skeldon, P., Thompson, G.E.
Format: Article
Language:English
Subjects:
Amorphous materials
Applied sciences
Coatings
Corrosion
Corrosion environments
Cross-disciplinary physics: materials science
rheology
Current density
Dry sliding wear
Durability
Exact sciences and technology
Materials science
Metallic coatings
Metals. Metallurgy
Morphology
Oxidation
Passivity
Physics
Plasma electrolytic oxidation
Production techniques
Protective coatings
Rutile
Surface treatment
Surface treatments
Titanium base alloys
Ti–6Al–4V alloy
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Summary:Coatings have been produced on Ti–6Al–4V alloy by plasma electrolytic oxidation (PEO) using an aqueous solution of Na2SiO3 and (NaPO3)6 with a pulsed electrical regime. The kinetics of coating growth revealed a relatively rapid initial rate, which then slowed significantly as the coating thickened. The coatings were composed of rutile, anatase and amorphous material, and contained relatively large amounts of silicon and phosphorus species. The rutile content increased with extended times of treatment. Corrosion tests showed that the passive current density was lower for short times of PEO treatment, probably due to a smaller number of coating defects. However, in dry sliding wear tests, a long treatment time produced improved durability. The enhanced wear resistance after a prolonged treatment is suggested to be due the modified composition and morphology of the coating. ► Thick coatings are quickly formed on Ti–6Al–4V by plasma electrolytic oxidation. ► The coatings were composed of rutile, anatase and amorphous material. ► Passive current density of the coatings was lower for short treatment times. ► Coatings with long treatment time are more wear-resistant.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2012.12.003