Passivation Behavior of 2507 Super Duplex Stainless Steel in Hot Concentrated Seawater:Influence of Temperature and Seawater Concentration

• 作者: Kang Zhao Xiao-Qi Li Li-Wei Wang Qi-Rong Yang Lian-Jun Cheng Zhong-Yu Cui
• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2022,（2）
• 页码范围: 326-340
• 页数: 15页
• 语种: 英文

摘要

The electrochemical behavior and passivation properties of 2507 super duplex stainless steel (SDSS) in the hot concentrated seawater with different concentrations at different temperatures are characterized by electrochemical methods and X-ray photoelectron spectroscopy.The passive film formed on 2507 SDSS belongs to n-type semiconductor and mainly composed of hydroxides and oxides of Fe and Cr under all circumstances.The protectiveness of the passive film decreases with the increase in temperature mainly because of the increase in defect density in the passive film.The corrosion resistance of 2507 decreases with the increase in seawater concentration,and the critical pitting temperature also decreases.