Article ID Journal Published Year Pages File Type
1656412 Surface and Coatings Technology 2016 8 Pages PDF
Abstract

•Mg-Al hydrotalcite film was in-situ grown on Mg-Gd-Zn alloy.•Zr2ON2 film was deposited to seal the micro-cracks of the hydrotalcite film.•The hydrotalcite film improved the cohesion of Zr2ON2 film to the substrate.•The composite film exhibited good protection efficiency and mechanical properties.

A Mg-Al hydrotalcite/Zr2ON2 composite film was deposited on Mg-Gd-Zn alloy by arc ion plating in order to improve the corrosion resistance and mechanical properties. The corrosion current density of the composite film sample immersed in a simulated body fluid is approximately 2.725 × 10−6 A cm−2, which is approximately two orders of magnitude less than that of the substrate. During 120 h immersion tests, results have shown that samples coated with the composite film have low hydrogen evolution rate. Moreover, scratch tests and nano-indentation measurements show that the composite film samples have superior mechanical properties. Such results demonstrate that coating Mg-Al hydrotalcite/Zr2ON2 composite film on Mg-Gd-Zn alloy can provide not only good protection efficiency but also stable protection.

Related Topics
Physical Sciences and Engineering Materials Science Nanotechnology
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