首页|A Semi-Mechanistic Model for Predicting the Service Life of Composite Coatings on VW63Z Magnesium Alloy
A Semi-Mechanistic Model for Predicting the Service Life of Composite Coatings on VW63Z Magnesium Alloy
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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(L1)and the diffusion time of electrolyte in the inorganic coating(L2),respectively;a second part interpreting the breakdown of coatings due to the cor-rosion process(L3);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.
Magnesium alloyService life predictionPlasma electrolytic oxidationElectrophoretic coatingCorrosion resistance
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