Effect of alternating voltage treatment on the microstructure and corrosion resistance of stannate conversion coating on AZ91D alloy |
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| Authors: | Xiaolan Liu Tao Zhang Yawei Shao Guozhe Meng Fuhui Wang |
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| Affiliation: | aCorrosion and Protection Laboratory, Key Laboratory of Superlight Materials and Surface Technology (Harbin Engineering University), Ministry of Education, Nantong ST 145, Harbin 150001, China;bState Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Wencui RD 62, Shenyang 110016, China |
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| Abstract: | A new stannate conversion coating (CC) on AZ91D alloy was synthesized by the application of alternative voltage (AV) treatment technique. By using AV technique, the formation process of CC can be controlled. SEM results indicated that a continuous and compact dual-layer CC was formed on alloy surface after AV treatment. TEM results revealed that the inner layer consists of magnesium–aluminum–stannum nano-crystals and amorphous, meanwhile, the outer layer is primarily a mixture of magnesium–stannum hydroxides and oxides with amorphous structure. The electrochemical experimental results revealed that AV treatment significantly improved the corrosion resistance of CC, which attributed to the distinguishing microstructure of AV-CC. |
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| Keywords: | A. Magnesium B. TEM B. SEM B. EIS C. Pitting corrosion |
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