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Microstructure and Corrosion Behavior of Composite Coating on Pure Mg Acquired by Sliding Friction Treatment and Micro-Arc Oxidation

1
College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2
Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China
3
Department of Material Science and Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(7), 1232; https://doi.org/10.3390/ma11071232
Received: 6 June 2018 / Revised: 15 July 2018 / Accepted: 15 July 2018 / Published: 18 July 2018
For the purpose of detecting the influence of grain structure of a Mg matrix on the microstructure and corrosion resistance of micro-arc oxidation (MAO) coating, prior to MAO processing, sliding friction treatment (SFT) was adopted to generate a fine-grained (FG) layer on coarse-grained (CG) pure Mg surface. It showed that the FG layer had superior corrosion resistance, as compared to the CG matrix, owing to the grain refinement; furthermore, it successfully survived after MAO treatment. Thus, an excellent FG-MAO coating was gained by combining SFT and MAO. The surface morphology and element composition of FG-MAO and CG-MAO samples did not show significant changes. However, the FG layer favorably facilitated the formation of an excellent MAO coating, which possessed a superior bonding property and greater thickness. Consequently, the modified FG-MAO sample possessed enhanced corrosion resistance, since a lower hydrogen evolution rate, a larger impedance modulus and a lower corrosion current were observed on the FG-MAO sample. View Full-Text
Keywords: pure Mg; corrosion; sliding friction treatment; fine grain; micro-arc oxidation pure Mg; corrosion; sliding friction treatment; fine grain; micro-arc oxidation
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Cao, H.; Huo, W.; Ma, S.; Zhang, Y.; Zhou, L. Microstructure and Corrosion Behavior of Composite Coating on Pure Mg Acquired by Sliding Friction Treatment and Micro-Arc Oxidation. Materials 2018, 11, 1232.

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