Abstract
In order to explore the wide application of AM60B in automobile field, nano-SiC/micro-arc oxidation (MAO) composite coating layer was prepared on the surface of AM60B to improve its high-temperature corrosion resistance. The electrochemical properties were studied in different temperature environments (ambient temperature (ABM), 60, 80, and 100 °C) using potentiodynamic polarization tests. The local corrosion properties were evaluated in 3.5% NaCl solution using Localized Electrochemical Impedance Spectroscopy (LEIS). The global electrochemical test results show that the impedance of nano-SiC/MAO coating is 1~2 orders of magnitude higher than that of MAO coating in high-temperature corrosion environment, and the main corrosion product is Mg(OH)2. The local electrochemical test results show that the minimum impedance of nano-SiC/MAO coating is 2×105 Ω higher than that of MAO coating, and the longitudinal depth and transverse width of scratch expansion are smaller than that of MAO coating. The scratch coating still has a protective effect on the substrate. The corrosion physical model of nano-SiC/MAO coating with scratches is proposed.
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The authors gratefully acknowledge the financial support from the Beijing Municipal Natural Science Foundation. (Grant No. 3192013).
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Dai, T., Zhao, J., Yang, X. et al. Global and Local Corrosion Performance of Nano-SiC Induced Micro-arc Oxidation Coating on Magnesium Alloy. J. of Materi Eng and Perform 31, 6747–6758 (2022). https://doi.org/10.1007/s11665-022-06724-5
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DOI: https://doi.org/10.1007/s11665-022-06724-5