Introduction of Cu2+ to the inside of the crevice by chelation and its effect on crevice corrosion of Type 316L stainless steel

Aoyama, Takahito; Kato, Chiaki

doi:10.1016/j.corsci.2022.110850

Cited by 3 publications

(1 citation statement)

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“…Currently, there are two primary theories about CC [ 3 , 5 , 9 ]: the critical crevice solution theory (CCST) and the IR drop theory (IRRT). As per CCST, changes of chemical composition inside the crevice (such as a decrease in pH value and an increase in Cl − concentration) could break the passive film [ 10 , 11 , 12 , 13 ], which consequently accelerates the generation of CC. In addition, based on the IR drop theory (“I” represents the current flowing through the corrosion circuits, while “R” refers to the solution resistance in the crevice), the IR drop is the crucial factor inducing the occurrence of CC [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

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

Zhu,

Zhang,

Bai

et al. 2024

Materials

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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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