Study on Corrosion Resistance of Micro-arc Oxidation Modified Magnesium Alloy in Three Kinds of Saturated Salt Solutions
AN Lingyun1, CHANG Chenggong2,3,*, KANG Disong1, WANG Zhao1, MENG Leichao1, PENG Jianhong1
1 Qinghai Provincial Key Laboratory of Nanomaterials and Technology, College of Physics and Electronic Information Engineering, Qinghai Minzu University, Xining 810007, China 2 Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, China 3 Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China
Abstract: Micro-arc oxidation (MAO) coatings were prepared on AZ31B magnesium alloy in the silicate system. The thickness of the coatings was measured by the TT260 digital eddy current thickness gauge, and the microscopic morphology, element and phase compositions as well as elemental chemical bonding state of the coatings were measured by SEM, EDS, XRD and XPS. Cyclic voltammetry curve, potentiodynamic polarization curve and electrochemical impedance spectroscopy were applied to evaluate the corrosion resistance of the coatings in saturated sodium sulfate, sodium chloride and sodium bicarbonate corrosive media. The results shown that the corrosion resistance and corrosive behavior of the coatings are different in diverse saturated salt solutions. In sodium sulfate corrosive media, SO42- ions can not react with the coating, and its ability of penetrating coating is also weaker ascribed to its larger radius. Therefore, the ring area enclosed by the cyclic voltammetry curve is the smallest, which is 2 and 4 orders of magnitude smaller than those of sodium chloride and sodium bicarbonate, respectively. The corrosion current density of the coating is 41.6% of that of saturated sodium chloride, and is 4 orders of magnitude lower compared to that of sodium bicarbonate. Meantime, its impedance modulus is also higher. Thus it presents the best corrosion resistance. In sodium chloride media, the corrosion resis-tance of the coating is poorer due to the high activity, small radius and strong penetrating power of Cl- ions, and the coating exhibits the stronger pitting corrosion characteristics. In sodium bicarbonate solution, the coating possesses the worst corrosion resistance owing to the reaction of HCO3- with the coating and porous characteristics of the coating. With the immersion time prolonging, the corrosion resistance of the coating in saturated sodium sulfate and sodium chloride corrosive media increases first and then decreases, while in saturated sodium bicarbonate, the corrosion resistance first reduces and then fluctuates.
作者简介: 安凌云,2009年6月、2019年6月分别于兰州理工大学获得工学学士学位和博士学位。现为青海民族大学副教授。主要从事轻金属表面改性与防护工作。2020年入选为青海省“昆仑英才·高端创新创业人才”拔尖人才。在Journal of Magnesium and Alloys、Surface & Coatings Technology、Transactions of Nonferrous Metals Society of China以及《中国有色金属学报》等期刊发表论文10余篇。
引用本文:
安凌云, 常成功, 康迪菘, 王钊, 孟雷超, 彭建洪. 镁合金微弧氧化膜在三种饱和盐溶液中的耐蚀性研究[J]. 材料导报, 2023, 37(7): 21070250-10.
AN Lingyun, CHANG Chenggong, KANG Disong, WANG Zhao, MENG Leichao, PENG Jianhong. Study on Corrosion Resistance of Micro-arc Oxidation Modified Magnesium Alloy in Three Kinds of Saturated Salt Solutions. Materials Reports, 2023, 37(7): 21070250-10.
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2023, Vol. 37 
