Preparation and corrosion resistance of basic carbonate coating on ZK61M magnesium alloy
Yang Yu,
Junge Chen,
Le Mi,
Aihu Feng,
Yun Yu,
Fei Xiao
Affiliations
Yang Yu
Department of Materials Science, Fudan University, Shanghai, 200433, PR China; Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, PR China; Corresponding author. Department of Materials Science, Fudan University, Shanghai, 200433, PR China.
Junge Chen
Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, PR China
Le Mi
Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, PR China
Aihu Feng
Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, PR China
Yun Yu
Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, PR China; Corresponding author. Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, PR China.
Fei Xiao
Department of Materials Science, Fudan University, Shanghai, 200433, PR China; Corresponding author.
In this study, a simple in-situ preparation method for coating on Mg-Zn alloy in a carbonic acid solution was investigated. The formation of a precursor carbonate layer on the alloy surface was observed. As the soaking time increased, the solution gradually turned alkaline, leading to the transformation of the precursor into a basic carbonate coating with a layered hydroxide structure. The corrosion potential (Ecorr) of the coated samples initially decreased and then increased with increasing the soaking time. After 2 h of soaking, the lowest corrosion potential observed was approximately −1.5105 V. At 12 h, the corrosion potential reached around −1.4645 V, which was comparable to that of the ZK61M magnesium alloy. After 48 h, the corrosion potential was measured to be approximately −1.3507 V.
