The Corrosion Behavior of AZ91D Magnesium Alloy in Simulated Haze Aqueous Solution

被引：26
|
作者：
Cui, Liying [1 ,2 ]
Liu, Zhiyong [1 ,2 ]
Hu, Peng [3 ]
Shao, Jiamin [1 ,2 ]
Li, Xiaogang [1 ,2 ,4 ]
Du, Cuiwei [1 ,2 ,4 ]
Jiang, Bin [5 ]
机构：
[1] Univ Sci & Technol Beijing, Corros & Protect Ctr, Beijing 100083, Peoples R China
[2] Univ Sci & Technol Beijing, Key Lab Corros & Protect MOE, Beijing 100083, Peoples R China
[3] Univ Sci & Technol Beijing, Minist Educ, Key Lab Environm Fracture, Beijing 100083, Peoples R China
[4] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
[5] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400030, Peoples R China
来源：
MATERIALS | 2018年 / 11卷 / 06期
基金：
中国国家自然科学基金;
关键词：
magnesium; EIS; SEM; pitting corrosion; ANODIC POLARIZATION CURVES; X70 PIPELINE STEEL; GALVANIC CORROSION; IMPEDANCE; SPECTROSCOPY; DISSOLUTION; COATINGS; CHLORIDE; MG;
D O I：
10.3390/ma11060970
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The corrosion process of AZ91D magnesium alloy in simulated haze aqueous solution has been studied by electrochemical measurements, immersion tests and morphology characterization. Results show that AZ91D was corroded heavily in simulated haze aqueous solution due to the loose and breakable product film on the surface providing little corrosion barrier. The effect of different ions was investigated. It was found that both consumed OH-, resulting in the absence of Mg(OH)(2) and serious corrosion. Meanwhile, SO42-and Cl- had influence on pitting corrosion. Magnesium aluminum oxide and MgAl2(SO4)(4)22H(2)O instead of Mg(OH)(2) were the dominate products, which is different from the former study. Corrosion rate changed with time, especially in the first 3 h. A two-stage corrosion mechanism is proposed after considering both the corrosion process and the influence of ions.
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页数：18
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