A Semi-Mechanistic Model for Predicting the Service Life of Composite Coatings on VW63Z Magnesium Alloy  

作　　者：Xiaoxue Wang Jingjing Guo Zihao Zeng Peng Zhou Rongqiao Wang Xiuchun Liu Kai Gao Jingli Sun Yong Yuan Fuhui Wang 

机构地区：[1]School of Energy and Power Engineering,Beihang University,Beijing,100191,China [2]Beijing Institute of Space Long March Vehicle,Beijing,100076,China [3]The School of Materials Science and Engineering,Northeastern University,Shenyang,110819,China [4]The State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang,110819,China [5]Shanghai Spaceflight Precision Machinery Institute,Shanghai,201600,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第7期1161-1176,共16页金属学报（英文版）

基　　金：support from the National Natural Science Foundation of China(No.52201066);the National Program for the Young Top-notch Professionals.

摘　　要：The application of Mg alloys is always accompanied by various coating technology, but a reliable model predicting the service life of coatings on Mg alloys is lacking but urgent. In this work, a semi-mechanistic model was proposed to predict the service life of plasma electrolytic oxidation (PEO) coating/electrophoretic coatings on a VW63Z Mg alloy;the model was decomposed into three parts: a first part depicting the degradation time of organic coating (L_(1)) and the diffusion time of electrolyte in the inorganic coating (L_(2)), respectively;a second part interpreting the breakdown of coatings due to the corrosion process (L_(3));a final part establishing an algorithm converting the accelerated tests into the real service environment (α);the effect of structural stress and dissimilar metal joints on the service life of coatings was also considered. Based on the ongoing accelerated experiments, the semi-mechanistic model could be able to predict the service life of both PEO coatings and composite coatings on VW63Z Mg alloy with a satisfiable precision.

关 键 词：Magnesium alloy Service life prediction Plasma electrolytic oxidation Electrophoretic coating Corrosion resistance 

分 类 号：TG174.4[金属学及工艺—金属表面处理]