Abstract
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 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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