Crevice Corrosion Behavior of 201 Stainless Steel in NaCl Solutions with Different pH Values by In Situ Monitoring

被引:4
作者
Zhu, Zejie [1 ]
Zhang, Hang [1 ]
Bai, Yihan [1 ]
Liu, Pan [2 ]
Yuan, Haoran [1 ]
Wang, Jiangying [1 ]
Cao, Fahe [3 ]
机构
[1] China Jiliang Univ, Sch Mat & Chem, Hangzhou 310018, Peoples R China
[2] Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Frontier Res Initiat, Sendai 9808579, Japan
[3] Sun Yat Sen Univ, Sch Mat, Shenzhen 518107, Peoples R China
基金
中国国家自然科学基金;
关键词
crevice corrosion; SECM; stainless steel; pH; TEMPERATURE; INITIATION; GEOMETRY;
D O I
10.3390/ma17051158
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
Crevice corrosion (CC) behavior of 201 stainless steel (SS) in 1 M NaCl + x M HCl/y M NaOH solutions with various pH was investigated using SECM and optical microscopic observations. Results show that the CC was initiated by the decrease in pH value within the crevice. The pH value near the crevice mouth falls rapidly to 1.38 in the first 2 h in the strongly acidic solution, while the pH value was observed to rise firstly and then decrease in the neutral and alkaline solutions. It indicates there is no incubation phase in the CC evolution of 201-SS in a pH = 2.00 solution, while an incubation phase was observed in pH = 7.00 and 11.00 solutions. Additionally, there appeared to be a radial pH variation within the gap over time. The pH value is the lowest at the gap mouth, which is in line with the in situ optical observation result that the severely corroded region is at the mouth of the gap. The decrease in pH value inside results in the negative shift of open circuit potential (OCP) and the initiation of CC of 201-SS. The increased anodic dissolution rate in the acidic solution accelerates the breakdown of passive film inside, reducing the initiation time and stimulating the spread of CC.
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页数:14
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