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《Electroplating & Finishing》 2014-08
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Study on mathematical model for simulating the corrosion rate of micro-arc oxidation coating on magnesium alloy

LI Yan;LI Si-rui;FENG Long-long;CHEN Ling-ling;GU Yan-hong;School of Mechanical Engineering,Beijing Institute of Petrochemical Technology;  
The mathematical model for corrosion rate of a micro-arc oxidation(MAO) coating on AZ31 magnesium was studied. The corrosion resistant coating on AZ31 Mg alloys was prepared from a Na3PO4 bath by MAO technology using various parameters including pulse frequency, voltage, oxidation time, and electrolyte concentration. The polarization curves for MAO coatings prepared at different pulse frequencies after immersion in simulated body fluid(SBF) for 1, 5, and 7 days were examined. The corrosion current densities of the MAO coatings prepared under different conditions after immersing for different time were measured. The principal component analysis for various parameters of MAO process and immersion time in SBF was carried out. A mathematical model for corrosion rate was established. The results showed that the corrosion current density of MAO coating is smaller than that of untreated Mg alloy substrate. Pulse frequency plays a leading role for corrosion rate. The relative error of the corrosion current density fitted by Tafel curves for the MAO coatings prepared under different process parameters after immersion in SBF for 24 h is less than 5%, as compared with the corrosion current densities calculated by using the regression equation. The coefficient of multiple determination is 0.902 1, implying that the regression equation can be reliably used for predicting the corrosion current densities of MAO coatings prepared on magnesium alloy under various parameters and immersed in SBF for different time. The method can be used for predicting and controlling the corrosion rates of MAO coatings on Mg and Mg alloys.
【Fund】: 国家自然科学基金(51305036);; 北京石油化工学院北京市本科生科学研究计划项目(J201300087)
【CateGory Index】: TG174.4
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