Influence of heat treatment on bond strength and corrosion resistance of sol-gel derived bioglass-ceramic coatings on magnesium alloy

Journal of the Mechanical Behavior of Biomedical Materials
Sibo ShenRuiyue Zhang

Abstract

In this study, bioglass-ceramic coatings were prepared on magnesium alloy substrates through sol-gel dip-coating route followed by heat treatment at the temperature range of 350-500°C. Structure evolution, bond strength and corrosion resistance of samples were studied. It was shown that increasing heat treatment temperature resulted in denser coating structure as well as increased interfacial residual stress. A failure mode transition from cohesive to adhesive combined with a maximum on the measured bond strength together suggested that heat treatment enhanced the cohesion strength of coating on the one hand, while deteriorated the adhesion strength of coating/substrate on the other, thus leading to the highest bond strength of 27.0MPa for the sample heat-treated at 450°C. This sample also exhibited the best corrosion resistance. Electrochemical tests revealed that relative dense coating matrix and good interfacial adhesion can effectively retard the penetration of simulated body fluid through the coating, thus providing excellent protection for the underlying magnesium alloy.

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Citations

Dec 29, 2015·Journal of the Mechanical Behavior of Biomedical Materials·R I M AsriZ Buyong
Sep 26, 2015·International Journal of Molecular Sciences·Weiwei LouGang Wu
Dec 26, 2015·Journal of the Mechanical Behavior of Biomedical Materials·Feiyang ZhangXiaodong Wu
Aug 19, 2015·Journal of the Mechanical Behavior of Biomedical Materials·A C PopaJ M F Ferreira
Dec 30, 2017·Bone Research·Chengde GaoCijun Shuai
Nov 2, 2019·Bioactive Materials·Joy-Anne N OliverDonghui Zhu

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