A discussion on evaluation criteria for crevice corrosion of various stainless steels. (20th February 2021)

• Record Type: Journal Article
• Authors: Wu, Xuan; Liu, Yuanyuan; Sun, Yangting; Dai, Nianwei; Li, Jin; Jiang, Yiming
• Is Part Of: Journal of materials science & technology. Volume 64(2021)
• Page Start: 29
• Page End: 37
• Publication Date: 2021-02-20
• Subjects: Stainless steel -- Crevice corrosion -- Crevice repassivation potential -- Critical chloride concentration; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2020.04.017
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: In this study, crevice corrosion performances of a newly developed LDSS 2002 and three commercial stainless steels (AISI 304, AISI 316L and DSS 2205) were investigated and discussed. Crevice repassivation potential ( E R, CREV ), which was measured by the potentiodynamic-galvanostatic-potentiodynamic (PD-GS-PD) test, was applicable to crevice corrosion evaluation of 304 and 316L stainless steels. However, much lower E R, CREV values were obtained for DSS 2205 and LDSS 2002. These abnormal E R, CREV values for duplex stainless steels may be related to the selective attack of the less corrosion-resistant phase, the lower corrosion potential in the crevice-like solution, and more crevice corrosion sites in the PD-GS-PD test. A critical chloride concentration of crevice corrosion (CCCCREV ) measurement was introduced for crevice corrosion evaluation of various stainless steels. The derived CCCCREV was proved to be a valid criterion for crevice corrosion evaluation of both the austenitic and duplex stainless steels. An order of crevice corrosion resistance of AISI 304 ≈ LDSS 2002 < AISI 316L < DSS 2205 was suggested, which agreed well with the orders of pitting resistance equivalent number and critical crevice index of the less corrosion-resistant phase in each material.