中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 30 No. 9 September 2020 |
（1. Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, State Key Laboratory of Power Transmission Equipment & System Safety and New Technology, College of Physics, Chongqing University, Chongqing 400044, China;
2. Material Corrosion and Protection Key Laboratory of Sichuan Province, Institute of Materials Science and Engineering, Sichuan University of Science and Engineering, Zigong 643000, China;
3. National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
4. College of Software, Chongqing College of Electronic Engineering, Chongqing 401331, China;
5. Chongqing Key Laboratory on Optoelectronic Functional Materials, College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China）
Abstract:The aspartic acid (ASP), an environment-friendly corrosion inhibitor, was explored to intercalate into the ZnAl-layered double hydroxide (ZnAl-LDH) and MgAl-LDH coatings on AZ31 magnesium alloys by a facile one-step hydrothermal method. The morphology, composition, structure and corrosion resistance of the prepared coatings were comparatively investigated. It is found that the uniform and dense layered nanosheet (NS) vertically grows on the substrate, and the MgAl-ASP-LDH films exhibit a three-dimensional (3D) rose-like sheet structure with high ratio of pore coverage. The MgAl-ASP-LDH coating exhibits better corrosion resistance and durability of longtime immersion than ZnAl-ASP-LDH coating. The corrosion current density of two coatings is two or three orders of magnitude lower than that of bare Mg alloy, indicating that ZnAl/MgAl-LDH films intercalated with organic ASP anions can significantly improve the corrosion resistance of Mg alloy.
Key words: hydrotalcite; magnesium alloy; aspartic acid; corrosion resistance; corrosion inhibitor
