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标题：Influence of delta ferrite on corrosion susceptibility of AISI 304 austenitic stainless steel
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作者：Lawrence O. Osoba ; Raheem A. Elemuren ; Ikenna C. Ekpe 等
期刊名称：Cogent Engineering
电子版ISSN：2331-1916
出版年度：2016
卷号：3
期号：1
页码：1150546
DOI：10.1080/23311916.2016.1150546
语种：English
出版社：Taylor and Francis Ltd
摘要：Abstract In the current study, the influence of delta (δ) ferrite on the corrosion susceptibility of AISI 304 austenitic stainless steel was evaluated in 1Molar concentration of sulphuric acid (H₂SO₄) and 1Molar concentration of sodium chloride (NaCl). The study was performed at ambient temperature using electrochemical technique—Tafel plots to evaluate the corrosive tendencies of the austenitic stainless steel sample. The as-received (stainless steel) specimen and 60% cold-worked (stainless steel) specimens were isothermally annealed at 1,100°C for 2 h and 1 h, respectively, and quenched in water. The results obtained show that the heat-treated specimen and the 60% cold-worked plus heat-treated specimen exhibited higher corrosion susceptibility than the as-received specimen, which invariably contained the highest fraction of δ ferrite particles. The finding shows that the presence of δ ferrite, in which chromium (Cr), the main corrosion inhibitor segregates, does not degrade and or reduces the resistance to aqueous corrosion of the austenitic stainless steel material.
关键词：austenitic stainless steel ; delta ferrite ; corrosion rates ; Tafel ; polarization resistance