Microstructural regulation of Zn-Mn alloy oxide films and investigation of corrosion resistance

Abstract

Increasing corrosion resistance has substantial practical importance for the development of Zn alloy surface treatment technology, as zinc and its alloys are commonly used as building decoration materials because to their excellent mechanical properties. In this study, an in-situ film creation process is used for regulating the anodization of Zn-0.5Mn alloy, and the microstructure is significantly impacted by current density. ZnO is the main component of anodization films, which have irregular porosity and imperfections in the surface. The oxide film color tends to be yellow as the current density increases, as confirmed by the chromaticity coordinates. The protective film has an order of magnitude lower corrosion resistance than the Zn-0.5Mn alloy under 10 A/dm² current density, according to the polarization curve and Electrochemical Impedance Spectroscopy measurements. The in-situ growth layer produced in this experiment can effectively extend the service life of the zinc alloy and improve the corrosion resistance of the zinc alloy.