Corrosion behavior of 316L stainless steel coatings on ZE41 magnesium alloy in chloride environments

Abstract

The corrosion behavior of the ZE41 magnesium alloy with a HVOF 316L stainless steel coating was electrochemically evaluated in 3.5 wt% NaCl solution and by salt spray testing. Electrochemical Impedance Spectroscopy (EIS) allowed determining the resistance of the coatings deposited, the growth of compact corrosion products on the ZE41 Mg alloy and the failure of the non-optimized coatings. The best coating resisted the chloride attack for long times in immersion and in salt spray environments, and it drastically reduced galvanic couple formation. Its behavior is associated with its reduced porosity and its higher compactness and mechanical stability.