Phytic acid conversion coating on Mg-Li alloy

作者：Gao Lili; Zhang Chunhong^*; Zhang Milin; Huang Xiaomei; Jiang Xi

来源：Journal of Alloys and Compounds, 2009, 485(1-2): 789-793.

DOI：10.1016/j.jallcom.2009.06.089

• Mg-Li alloy
• Chemical conversion coating
• Phytic acid
• Chelate compound
• Corrosion resistance

An environment-friendly chemical conversion coating for Mg-Li alloy was obtained by using a phytic acid solution. The influencing factors of phytic acid conversion coating were discussed through orthogonal experiments. and the optimum processing parameters were confirmed. Then morphology, composition. the forming process and corrosion resistance of the coating were investigated. Analysis by SEM showed that the phytic acid conversion coating was a uniform coating with white flower-like deposit. EDS and FT-IR images displayed that the conversion coating consisted of Mg, Al, O, P and C, the main composition of the coating was the chelate compounds of phytic acid and Mg(2+) or Al(3+). Analysis of open circuit potential (OCP) evolution illustrated that 600 s was a sufficient forming time for the conversion coating The results of electrochemical potentiodynamic polariza

• 出版日期2009-10-19
• 单位哈尔滨工程大学