Microstructure and Corrosion Resistance of Zn-Mg Alloy Coatings

Xiaodong Hao, Chongfeng Yue, Qiuyuan Liu, Sheming Jiang, Qifu Zhang, Yanan Bai, Lingjun Li

Abstract


Mg was evaporated onto GI substrate. With annealing followed, Zn-Mg alloy coating was acquired. Microstructure and chemical element of Zn-Mg alloy coatings were analyzed by SEM and EDS respectively. Anti-corrosion performance of Zn-Mg alloy coatings was studied by salt spray test (SST) and electrochemical test. Alloy phases and corrosion products were inspected by XRD. Study showed that Zn-Mg alloy phase was mainly MgZn2, MgZn, Mg2Zn11 and Mg7Zn3. The alloy coatings had excellent corrosion resistance on coating surfaces. Compared with GI, Zn-Mg alloy coatings have lower Icorr current and bigger polarization resistance. And its corrosion products are more compact.


DOI
10.12783/dtmse/smne2016/10568

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