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Metals 2016, 6(12), 308; doi:10.3390/met6120308

Formation and Corrosion Resistance of Micro-Arc Oxidation Coating on Equal-Channel Angular Pressed AZ91D Mg Alloy

1
College of Mechanics and Materials, Hohai University, Nanjing 210098, China
2
Suqian Institute, Hohai University, Suqian 223800, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Vijayaraghavan Venkatesh, Raman Singh and Vinod Kumar
Received: 21 October 2016 / Revised: 1 December 2016 / Accepted: 2 December 2016 / Published: 7 December 2016
(This article belongs to the Special Issue Corrosion of Magnesium Alloys)
View Full-Text   |   Download PDF [4559 KB, uploaded 7 December 2016]   |  

Abstract

A commercial AZ91D Mg alloy, after bulk grain refinement by various passes of equal-channel angular pressing (ECAP), was selected for micro-arc oxidation (MAO) in silicate electrolyte, corrosion testing in 3.5 wt % NaCl solution and morphology analyses. The results showed that a large number of ECAP passes resulted in the homogeneous ultrafine-grained (UFG) Mg substrate with broken second-phases. The high-energy defects in the ECAPed samples lowered the anodizing potential of the MAO process, but the partial discharge was severe for those samples below eight passes. Increasing the ECAP pass, the compactness and thickness of the MAO coating first decreased and then increased. Due to the compact coating and the existence of Mg2SiO4, the coated alloy with 16 ECAP passes has a lower corrosion rate and a larger Rt value. Besides the well-known strengthening-toughening effect, grain refinement via multi-pass ECAP can improve surface protection of the MAO coating on the UFG Mg alloy. View Full-Text
Keywords: magnesium alloy; bulk grain refinement; ECAP; corrosion resistance; MAO magnesium alloy; bulk grain refinement; ECAP; corrosion resistance; MAO
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ma, A.; Lu, F.; Zhou, Q.; Jiang, J.; Song, D.; Chen, J.; Zheng, Y. Formation and Corrosion Resistance of Micro-Arc Oxidation Coating on Equal-Channel Angular Pressed AZ91D Mg Alloy. Metals 2016, 6, 308.

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