Novel multilayer Mg-Al intermetallic coating for corrosion protection of magnesium alloy
(0) A novel multilayer Mg-Al intermetallic coating on magnesium alloy was successfully obtained by AlCl3-NaCl molten salt bath treatment.Molten salt bath treatment at 400 ℃,which is lower than the treatment temperature of the solid diffusion Al powder,results in the formation of thick All2Mgl7,Al0.58Mg0.42 and Al3Mg2 multilayer Mg-Al intermetallic coating.In contrast to the conventional powder pack solid diffusion process,active Al atoms can be formed at a lower temperature in molten salts,which contributes to the lower temperature formation of continuous intermetallic layers.The corrosion resistance of AZ91D alloy without and with coating by multilayer of Mg-Al intermetallic compound was evaluated by electrochemical impedance spectroscopy measurements in 3.5 wt% NaCl solution.Therefore,the polarization resistance of the multilayer coating on magnesium alloy by molten salt bath treatment was greater than the uncoated one,which is attributed to the homogenously distributed intermetallic phases.
multilayer structure diffusion intermetallic coating corrosion
He Meifeng Zhao Su Liu Lei Wu YaTing
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, Chi School of Mechanical Engineering, Shanghhai Dianji University, Shanghai 200240, China
国际会议
上海
英文
259-259
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）