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《Journal of University of Science and Technology Beijing》 2004-06
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Degradation of Paint Finishing on Magnesium Alloys in Salt Spray Characterized by Electrochemical Impedance Spectroscopy

TU Yunhua, GAO Jin, LI Jiuqing, ZHANG WeiMaterials Science and Engineering School, University and Science and Technology Beijing; Beijing Key Laboratory for Corrosion, Erosion and Surface Technology, Beijing, 100083, China  
Compared with painted carbon steel, the degradation of the paint finishing system of magnesium alloys in salt spray was studied by Electrochemical Impedance Spectroscopy (EIS). The result showed that whether based on chromate conversion coating or not, the electrode process of the paint system on magnesium alloys was more inclined to be controlled by diffusion than that on carbon steel, and the slop of the diffusion line was less than 1. The possible reason was given. It was proved that inductance unit existed in the finishing system with chromate conversion coating. The coating resistance and capacitance were calculated with all EIS data. The finishing system with chromate conversion coating absorbed much more water and corroded more severely than that without chromate conversion coating. The calculated values were not fixed but varied, and the more severely the coating degraded, the more widely the value ranged.
【Fund】: 国家自然科学基金资助项目(No.50122118)
【CateGory Index】: TG174
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