镁合金微弧氧化膜在三种饱和盐溶液中的耐蚀性研究

doi:10.11896/cldb.21070250

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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, SO₄^2- 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.

Key words： magnesium alloy micro-arc oxidation microstructure saturated Na₂SO₄ media saturated NaCl media saturated NaHCO₃ media corrosion resistance

Published: 10 April 2023 Online: 2023-04-07

CLC number:

TG174

Fund:Natural Science Foundation of Qinghai Province (2020-ZJ-966Q), High-level Talents Project of Qinghai Nationalities University (2021XJG13), and Top Talents of ‘Kunlun Talents · High-end Innovation and Entrepreneurship Talents’ of Qinghai Province.

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	Articles by authors
	AN Lingyun
	CHANG Chenggong
	KANG Disong
	WANG Zhao
	MENG Leichao
	PENG Jianhong

Cite this article:

AN Lingyun,CHANG Chenggong,KANG Disong, et al. Study on Corrosion Resistance of Micro-arc Oxidation Modified Magnesium Alloy in Three Kinds of Saturated Salt Solutions[J]. Materials Reports, 2023, 37(7): 21070250-10.

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http://www.mater-rep.com/EN/10.11896/cldb.21070250 OR http://www.mater-rep.com/EN/Y2023/V37/I7/21070250

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