Influence of intermetallic Al-Mn particles on in-situ steam Mg-Al-LDH coating on AZ31 magnesium alloy

LI, Feng, Sun, Xiang, Song, Liang, Kannan, M. Bobby, Zhang, Fen, Cui, Lan-yue, Zou, Yu-hong, Li, Shuo-qi, Liu, Cheng-bao, and Zeng, Rong-chang (2022) Influence of intermetallic Al-Mn particles on in-situ steam Mg-Al-LDH coating on AZ31 magnesium alloy. Transactions of Nonferrous Metals Society of China, 32 (12). pp. 3926-3949.

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Abstract

The influence of intermetallic Al-Mn particles on the corrosion behavior of in-situ formed Mg-Al layered double hydroxide (Mg-Al-CO32--LDH) steam coating on AZ31 Mg alloy was investigated. The alloy was pretreated with H3PO4, HCl, HNO3 or citric acid (CA), followed by hydrothermal treatment, for the fabrication of Mg-Al-LDH coating. The microstructure, composition and corrosion resistance of the coated samples were investigated. The results showed that the surface area fraction of Al-Mn phase exposed on the surface of the alloy was significantly increased after CA pretreatment, which promotes the growth of the Mg-Al-LDH steam coating. Further, the LDH-coated alloy pretreated with CA possessed the most compact surface and the maximum coating thickness among all the coatings. The corrosion current density of the coated alloy was decreased by three orders of magnitude as compared to that of the bare alloy.

Item ID: 77543
Item Type: Article (Research - C1)
ISSN: 2210-3384
Keywords: acid pretreatment, corrosion resistance, intermetallic particles, layered double hydroxide, magnesium alloy, steam coating
Copyright Information: © 2022 The Nonferrous Metals Society of China. Published by Elsevier Ltd & Science Press. Under a Creative Commons license (CC BY-NC-ND 4.0).
Date Deposited: 13 Mar 2023 01:07
FoR Codes: 40 ENGINEERING > 4016 Materials engineering > 401607 Metals and alloy materials @ 100%
SEO Codes: 24 MANUFACTURING > 2407 Fabricated metal products > 240701 Coated metal and metal-coated products @ 100%
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