工程科学学报，第40卷，第5期：587-593,2018年5月 Chinese Journal of Engineering,Vol.40,No.5:587-593,May 2018 DOI:10.13374/j.issn2095-9389.2018.05.009;http://journals.ustb.edu.cn 2507双相不锈钢在S0,污染模拟海水中的腐蚀行为 朱敏12)四，朱涛)，陈 明)，郭绍义”，袁永锋)，俞高红)，聂轮2) 1)浙江理工大学机械与自动控制学院，杭州3100182)浙江美力科技股份有限公司，新昌312500 ☒通信作者，E-mail:zmii2009@163.com 摘要采用开路电位、电化学阻抗谱(EIS)、Mot-Schottky曲线和浸泡腐蚀实验研究了2507双相不锈钢在含不同浓度(0， 0.001和0.01molL1)NaHS0,模拟海水中的腐蚀行为.研究表明：开路电位随NaHS0,浓度的增加而负移，腐蚀倾向增大； 电荷转移电阻R,随浓度的增加而减小，耐蚀性降低：2507不锈钢的腐蚀形态为局部腐蚀，点蚀程度随浓度升高有所加剧，腐蚀 速率随浓度的增加而增大；Mott-Schottky曲线和成膜后电化学阻抗谱测试表明，NaHS0,的加入增加了2507不锈钢表面钝化 膜的点缺陷浓度，降低了钝化膜的稳定性，电荷转移阻力减小，腐蚀更容易发生.这可能归因于NH$03的加入增加了模拟海 水的酸度，并随NaHSO,浓度的增加促进了不锈钢表面钝化膜的破坏. 关键词2507不锈钢：腐蚀行为：钝化膜：点蚀：NHS0, 分类号TG172.5 Corrosion behavior of 2507 duplex stainless steel in simulated SO2-Polluted seawater ZHU Min'2),ZHU Tao,CHEN Ming,GUO Shao-yi,YUAN Yong-feng,YU Gao-hong,NIE Lun2) 1)School of Mechanical Engineering and Automation,Zhejiang Sci-Tech University,Hangzhou 310018,China 2)Zhejiang Meili High Technology Co.,Ltd.,Xinchang 312500,China Corresponding author,E-mail:zmii2009@163.com ABSTRACT The corrosion behavior of 2507 duplex stainless steel in simulated seawater containing different concentrations of NaH- SO,solution was investigated using open circuit potential,electrochemical impedance spectroscopy (EIS),Mott-Schottky curves,and an immersion corrosion test.The results depict that the open circuit potential shifts negatively with an increase in the concentration of NaHSO,whereas the corrosion tendency of the steel increases.The charge transfer resistance (R,decreases with the increased con- centration of NaHSO,,which suggests that the corrosion resistance is reduced.The corroded stainless steel exhibits localized pitting corrosion.Further,the degree of corrosion as well as the corrosion rate increases with an increase in the concentration of NaHSO,.The results that are obtained using the Mott-Schottky curves and EIS test depict that the addition of NaHSO,increases the concentration of point defects on the passive surface film of 2507 stainless steel,reducing its stability and decreasing its charge transfer resistance,re- sulting in an increased probability of corrosion.This may be caused due to the fact that the addition of NaHSO,increases the acidity of the solution,which accelerates the damage that is caused to the passive film on the stainless steel. KEY WORDS 2507 stainless steel;corrosion behavior;passive film;pitting corrosion;sodium hydrogen sulfite 2507双相不锈钢是一种兼具铁素体α相和奥 1:1,具有极强的抗点腐蚀、缝隙腐蚀和应力腐蚀的 氏体γ相两种显微组织的不锈钢，两相比例约为 能力，具有屈服强度高、韧性好和疲劳强度高等优 收稿日期：2017-08-01 基金项目：国家自然科学基金资助项目(51501164)：浙江省自然科学基金资助项目(LY18010004)；中国博士后科学基金资助项目 (2017M621974)工程科学学报,第 40 卷,第 5 期:587鄄鄄593,2018 年 5 月 Chinese Journal of Engineering, Vol. 40, No. 5: 587鄄鄄593, May 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 05. 009; http: / / journals. ustb. edu. cn 2507 双相不锈钢在 SO2 污染模拟海水中的腐蚀行为 朱 敏1,2) 苣 , 朱 涛1) , 陈 明1) , 郭绍义1) , 袁永锋1) , 俞高红1) , 聂 轮2) 1) 浙江理工大学机械与自动控制学院, 杭州 310018 2) 浙江美力科技股份有限公司, 新昌 312500 苣 通信作者, E鄄mail:zmii2009@ 163. com 摘 要 采用开路电位、电化学阻抗谱(EIS)、Mott鄄鄄 Schottky 曲线和浸泡腐蚀实验研究了 2507 双相不锈钢在含不同浓度(0, 0郾 001 和 0郾 01 mol·L - 1 )NaHSO3 模拟海水中的腐蚀行为. 研究表明:开路电位随 NaHSO3 浓度的增加而负移,腐蚀倾向增大; 电荷转移电阻 Rt随浓度的增加而减小,耐蚀性降低;2507 不锈钢的腐蚀形态为局部腐蚀,点蚀程度随浓度升高有所加剧,腐蚀 速率随浓度的增加而增大;Mott鄄鄄 Schottky 曲线和成膜后电化学阻抗谱测试表明,NaHSO3 的加入增加了 2507 不锈钢表面钝化 膜的点缺陷浓度,降低了钝化膜的稳定性,电荷转移阻力减小,腐蚀更容易发生. 这可能归因于 NaHSO3 的加入增加了模拟海 水的酸度,并随 NaHSO3 浓度的增加促进了不锈钢表面钝化膜的破坏. 关键词 2507 不锈钢; 腐蚀行为; 钝化膜; 点蚀; NaHSO3 分类号 TG172郾 5 收稿日期: 2017鄄鄄08鄄鄄01 基金项目: 国家自然科学基金资助项目(51501164 ); 浙江省自然科学基金资助项目( LY18E010004 ); 中国博士后科学基金资助项目 (2017M621974) Corrosion behavior of 2507 duplex stainless steel in simulated SO2 鄄鄄Polluted seawater ZHU Min 1,2) 苣 , ZHU Tao 1) , CHEN Ming 1) , GUO Shao鄄yi 1) , YUAN Yong鄄feng 1) , YU Gao鄄hong 1) , NIE Lun 2) 1) School of Mechanical Engineering and Automation, Zhejiang Sci鄄Tech University, Hangzhou 310018, China 2) Zhejiang Meili High Technology Co. , Ltd. , Xinchang 312500, China 苣 Corresponding author, E鄄mail:zmii2009@ 163. com ABSTRACT The corrosion behavior of 2507 duplex stainless steel in simulated seawater containing different concentrations of NaH鄄 SO3 solution was investigated using open circuit potential, electrochemical impedance spectroscopy (EIS), Mott鄄鄄Schottky curves, and an immersion corrosion test. The results depict that the open circuit potential shifts negatively with an increase in the concentration of NaHSO3 , whereas the corrosion tendency of the steel increases. The charge transfer resistance (Rt) decreases with the increased con鄄 centration of NaHSO3 , which suggests that the corrosion resistance is reduced. The corroded stainless steel exhibits localized pitting corrosion. Further, the degree of corrosion as well as the corrosion rate increases with an increase in the concentration of NaHSO3 . The results that are obtained using the Mott鄄鄄 Schottky curves and EIS test depict that the addition of NaHSO3 increases the concentration of point defects on the passive surface film of 2507 stainless steel, reducing its stability and decreasing its charge transfer resistance, re鄄 sulting in an increased probability of corrosion. This may be caused due to the fact that the addition of NaHSO3 increases the acidity of the solution, which accelerates the damage that is caused to the passive film on the stainless steel. KEY WORDS 2507 stainless steel; corrosion behavior; passive film; pitting corrosion; sodium hydrogen sulfite 2507 双相不锈钢是一种兼具铁素体 琢 相和奥 氏体 酌 相两种显微组织的不锈钢,两相比例约为 1颐 1,具有极强的抗点腐蚀、缝隙腐蚀和应力腐蚀的 能力,具有屈服强度高、韧性好和疲劳强度高等优