Phytic acid conversion coating on Mg–Li alloy
2009; Elsevier BV; Volume: 485; Issue: 1-2 Linguagem: Inglês
10.1016/j.jallcom.2009.06.089
ISSN1873-4669
AutoresLili Gao, Chunhong Zhang, Milin Zhang, Xiaomei Huang, Xi Zhi Jiang,
Tópico(s)Aluminum Alloys Composites Properties
ResumoAn 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 Mg2+ or Al3+. 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 polarization and hydrogen evolution measurement indicated that the phytic acid conversion coating provided effective protection to the substrate of Mg–Li alloy.
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