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A Zinc-Rich Coating Fabricated on a Magnesium Alloy by Oxide Reduction

1,2,3,*, 1,2,3, 1,2,3 and 1,2,3
CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Science, Qingdao 266071, China
Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
Author to whom correspondence should be addressed.
Coatings 2019, 9(4), 278;
Received: 1 April 2019 / Revised: 19 April 2019 / Accepted: 24 April 2019 / Published: 25 April 2019
PDF [7263 KB, uploaded 25 April 2019]


The corrosion resistance of magnesium alloys could be enhanced by covering metallic coatings on the surface. The zinc-rich coating is one of these metallic coatings. To fabricate a zinc-rich coating on magnesium alloys, the substrate should be pretreated carefully, and a protective atmosphere is usually required. In this research, a zinc-rich coating was successfully fabricated on the AZ91D magnesium alloy in air by a diffusion alloying method, with zinc oxide as the zinc source. At the same time, the pretreatment of the magnesium alloy matrix was greatly simplified. The as-diffusion-alloyed zinc-rich intermetallic layer was investigated, utilizing SEM, EDS, and XRD, respectively. It is inferred that zinc oxide was reduced into Zn atoms by the active Mg atoms, and the Mg atoms were coming from the magnesium alloy matrix. Then the Zn atoms passed through the oxide film and formed an intermetallic layer on the magnesium alloy surface. Thus, taking advantage of the activity of Mg atoms, magnesium alloys could be surface alloyed with oxides. View Full-Text
Keywords: magnesium alloy; zinc oxide; diffusion; coating; surface treatment magnesium alloy; zinc oxide; diffusion; coating; surface treatment

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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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Lu, D.; Huang, Y.; Duan, J.; Hou, B. A Zinc-Rich Coating Fabricated on a Magnesium Alloy by Oxide Reduction. Coatings 2019, 9, 278.

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