Pitting Mechanism of Passive 304 Stainless Steel Mono-crystal in Sulphuric Media Containing Chlorion

Zhang Puqiang; Wu Jixun; Zhang Wenqi; Wang Kuang

doi:10.13374/j.issn1001-053x.1991.06.032

Volume 13 Issue 6

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Zhang Puqiang, Wu Jixun, Zhang Wenqi, Wang Kuang. Pitting Mechanism of Passive 304 Stainless Steel Mono-crystal in Sulphuric Media Containing Chlorion[J]. Chinese Journal of Engineering, 1991, 13(6): 590-596. doi: 10.13374/j.issn1001-053x.1991.06.032

Citation:

Zhang Puqiang, Wu Jixun, Zhang Wenqi, Wang Kuang. Pitting Mechanism of Passive 304 Stainless Steel Mono-crystal in Sulphuric Media Containing Chlorion[J]. Chinese Journal of Engineering, 1991, 13(6): 590-596. doi: 10.13374/j.issn1001-053x.1991.06.032

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Pitting Mechanism of Passive 304 Stainless Steel Mono-crystal in Sulphuric Media Containing Chlorion

doi: 10.13374/j.issn1001-053x.1991.06.032

1. Department of Surface and Corrosion Engineering;
2. Shenzhen Dapeng Corros, and Prot, Tech, and Eng, Co., Shenzhen China

Received Date: 1990-10-12
Available Online: 2021-10-26

Abstract

Abstract

The pitting mechanism of passive 304 stainless steel monocrystal in pH1.0, 0.25mol/l Na₂SO₄ solutions containing chlorion has been investigated using a. c. impedance technique. The impedance characteristics in pit initiation and propagation stages have been analysed. It is proposed that an intermediate complex (MOHCI)comc will form in both the two stages. A pitting mechanism model and an equivalent circuit model in pit propagation stage have been propesen, it has no intrinsic difference with that for 304 ss polycrystal.
- a.c. imopedance,
- stainless steel monocrystal,
- chlorion,
- pitting