Eliminating detrimental effect of cold working on pitting corrosion resistance in high nitrogen austenitic stainless steels
By Wang, Qingchuan; Zhang, Bingchun; Ren, Yibin; Yang, Ke
Published in Corrosion Science
NULL
2017
Abstract
Abstract The detrimental effect of cold working on pitting corrosion resistance was surprisingly found totally eliminated in high nitrogen stainless steels (HNS) with higher nitrogen content (0.92 wt.%) by electrochemical tests in chloride solution. Inclusions morphology and microstructure of cold-worked {HNS} were investigated. Then the passive film on {HNS} was analyzed by secondary ion mass spectroscopy (SIMS). For the first time nitrogen enrichment as a form of short range ordered [CrN] was observed in the chromium oxide layer of passive film on HNS. A possible reaction involving nitrogen enrichment is proposed to elucidate this exceptional behavior of corrosion resistance for HNS.
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