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The Role of Ammonium Chloride in the Powder Thermal Diffusion Alloying Process on a Magnesium Alloy

1,2,3,*, 1,2,3, 1,2,3, 1,2,3, 1,2,3 and 1,2,3
1
CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Science, Qingdao 266071, China
2
Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
3
Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(4), 252; https://doi.org/10.3390/coatings9040252
Received: 22 March 2019 / Revised: 10 April 2019 / Accepted: 13 April 2019 / Published: 15 April 2019
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Abstract

The powder thermal diffusion alloying method could be utilized to fabricate Al-rich intermetallic coatings on magnesium alloys in the air. While the role of ammonium chloride powder in the diffusion alloying source is still to be investigated. This research took the AZ91D magnesium alloy as the substrate. Diffusion sources with various powders were utilized as the diffusion source. Microstructure observation and phase identification were enrolled to investigate the role of the ammonium chloride powder in the diffusion alloying process. Results indicate that HCl gas could turn some solid Al powder into gaseous AlCl3 to enhance the transport of active Al atoms, moreover, it reacts with the dense MgO film and converts it to a loose one, which enables the AlCl3 gas to penetrate MgO and arrive the matrix to form a protective coating. Furthermore, the ammonium chloride content should be confined to 10 wt. % of the diffusion alloying source. Too much ammonium chloride powder would result in a worse intermetallic coating. View Full-Text
Keywords: magnesium alloy; ammonium chloride; diffusion; coating; powder magnesium alloy; ammonium chloride; diffusion; coating; powder
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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.; Jiang, Q.; Zheng, M.; Zhang, J.; Huang, Y.; Hou, B. The Role of Ammonium Chloride in the Powder Thermal Diffusion Alloying Process on a Magnesium Alloy. Coatings 2019, 9, 252.

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