工程科学学报，第41卷，第2期：246-253,2019年2月 Chinese Joural of Engineering,Vol.41,No.2:246-253,February 2019 DOI:10.13374/j.issn2095-9389.2019.02.012;http://journals.ustb.edu.cn Mn对2205双相不锈钢耐点蚀性能的影响 郑建超”，潘超)，张建涛”，付少鹏2)，林平2)，胡晓军) 1)北京科技大学钢铁冶金新技术国家重点实验室，北京1000832)瑞浦科技集团有限公司，丽水323903 ☒通信作者，E-mail:huxiaojun(@usth.edu.cn 摘要研究锰元素对2205双相不锈钢耐点蚀性能的影响，锰质量分数的变化范围为0.93%~1.26%.分别采用化学腐蚀 法、动电位极化法研究双相不锈钢2205的耐腐蚀性能，采用夹杂物自动分析技术研究锰对钢中夹杂物种类及数量的影响.通 过扫描电镜、能谱及夹杂物原位分析法观察化学腐蚀及电化学腐蚀前后钢中夹杂物及其周围钢基体的变化情况.采用电感耦 合等离子体发光光谱测定腐蚀产物的成分.研究结果表明，不同类型的夹杂物对耐腐蚀性能的影响不同，(M,Si)氧化物以 及(Mn、Si,Cr)氧硫化物在腐蚀液中更易溶解进而促进腐蚀，而(Cr、Mn、AI)氧化物却很稳定.锰的加入会促进钢中(Cr,Mn、 A)夹杂的析出，此类夹杂物不仅自身很容易被含C1离子的溶液腐蚀，而且作为点蚀的起始点，促进了点蚀坑的形成，加快了 基体腐蚀，最终导致不锈钢耐点蚀性能的下降. 关键词双相不锈钢；点蚀；夹杂物；化学腐蚀；基体 分类号TG142.72 Effect of manganese addition on resistance to pitting corrosion of duplex stainless steel S32205 ZHENG Jian-chao,PAN Chao,ZHANG Jian-tao,FU Shao-peng?),LIN Ping,HU Xiao-jun 1)State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083.China 2)Ruipu Technology Co.Ltd.,Lishui 323903,China Corresponding author,E-mail:huxiaojun@ustb.edu.cn ABSTRACT Duplex stainless steel (DSS)has been applied to marine industries,chemical plants,and nuclear facilities because of its high mechanical strength,good weldability,good resistance to pitting corrosion in various aggressive environments,and relatively low cost than similar-performance materials.However,with the decline of iron and steel industries,the competition among stainless steel products is becoming fierce.To reduce the costs of stainless steel,enterprises have attempted to replace high-priced alloy ele- ments with low-priced alloy elements.Thus,the project of substituting manganese for nickel has attracted considerable attention.In this study,effect of manganese addition in the range of 0.93%-1.26%on the resistance to pitting corrosion of duplex stainless steel in chloride medium was investigated.Chemical corrosion and potentiodynamic anodic polarization tests were conducted to assess the resist- ance to pitting corrosion.Categories and number of inclusions were analyzed using inclusion automatic analysis technology.Changes of inclusions before or after chemical and electrochemical corrosion were observed using in situ observation,scanning electron microscope and energy dispersive spectrometer analysis.Inductively coupled plasma test was conducted to analyze compositions of corrosion prod- ucts.The results indicate that different inclusions have different effects on pitting corrosion.Types of(Mn,Si)oxides and complex in- clusions of (Mn,Si,and Cr)oxysulfides are dissolved,which accelerates the corrosion process.However,the types of (Cr,Mn,and Al)oxides are stable in similar environment.The addition of manganese leads to the deterioration of the resistance of dplex stainless steel to pitting corrosion because manganese accelerates the formation of(Mn,Si)oxides that act as initial locations of pitting corrosion in chlorine ion corrosion environment.Dissolved inclusions help to expose fresh matrix to etchant solution,accelerating the corrosion of 收稿日期：2018-09-13工程科学学报,第 41 卷,第 2 期:246鄄鄄253,2019 年 2 月 Chinese Journal of Engineering, Vol. 41, No. 2: 246鄄鄄253, February 2019 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2019. 02. 012; http: / / journals. ustb. edu. cn Mn 对 2205 双相不锈钢耐点蚀性能的影响 郑建超1) , 潘 超1) , 张建涛1) , 付少鹏2) , 林 平2) , 胡晓军1) 苣 1) 北京科技大学钢铁冶金新技术国家重点实验室, 北京 100083 2) 瑞浦科技集团有限公司, 丽水 323903 苣通信作者, E鄄mail: huxiaojun@ ustb. edu. cn 摘 要 研究锰元素对 2205 双相不锈钢耐点蚀性能的影响,锰质量分数的变化范围为 0郾 93% ~ 1郾 26% . 分别采用化学腐蚀 法、动电位极化法研究双相不锈钢 2205 的耐腐蚀性能,采用夹杂物自动分析技术研究锰对钢中夹杂物种类及数量的影响,通 过扫描电镜、能谱及夹杂物原位分析法观察化学腐蚀及电化学腐蚀前后钢中夹杂物及其周围钢基体的变化情况. 采用电感耦 合等离子体发光光谱测定腐蚀产物的成分. 研究结果表明,不同类型的夹杂物对耐腐蚀性能的影响不同,(Mn、Si)氧化物以 及(Mn、Si、Cr)氧硫化物在腐蚀液中更易溶解进而促进腐蚀,而(Cr、Mn、Al)氧化物却很稳定. 锰的加入会促进钢中(Cr、Mn、 Al)夹杂的析出,此类夹杂物不仅自身很容易被含 Cl 离子的溶液腐蚀,而且作为点蚀的起始点,促进了点蚀坑的形成,加快了 基体腐蚀,最终导致不锈钢耐点蚀性能的下降. 关键词 双相不锈钢; 点蚀; 夹杂物; 化学腐蚀; 基体 分类号 TG142郾 72 收稿日期: 2018鄄鄄09鄄鄄13 Effect of manganese addition on resistance to pitting corrosion of duplex stainless steel S32205 ZHENG Jian鄄chao 1) , PAN Chao 1) , ZHANG Jian鄄tao 1) , FU Shao鄄peng 2) , LIN Ping 2) , HU Xiao鄄jun 1) 苣 1) State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China 2) Ruipu Technology Co. Ltd. , Lishui 323903, China 苣Corresponding author, E鄄mail: huxiaojun@ ustb. edu. cn ABSTRACT Duplex stainless steel (DSS) has been applied to marine industries, chemical plants, and nuclear facilities because of its high mechanical strength, good weldability, good resistance to pitting corrosion in various aggressive environments, and relatively low cost than similar鄄performance materials. However, with the decline of iron and steel industries, the competition among stainless steel products is becoming fierce. To reduce the costs of stainless steel, enterprises have attempted to replace high鄄priced alloy ele鄄 ments with low鄄priced alloy elements. Thus, the project of substituting manganese for nickel has attracted considerable attention. In this study, effect of manganese addition in the range of 0郾 93% 鄄鄄1郾 26% on the resistance to pitting corrosion of duplex stainless steel in chloride medium was investigated. Chemical corrosion and potentiodynamic anodic polarization tests were conducted to assess the resist鄄 ance to pitting corrosion. Categories and number of inclusions were analyzed using inclusion automatic analysis technology. Changes of inclusions before or after chemical and electrochemical corrosion were observed using in situ observation, scanning electron microscope and energy dispersive spectrometer analysis. Inductively coupled plasma test was conducted to analyze compositions of corrosion prod鄄 ucts. The results indicate that different inclusions have different effects on pitting corrosion. Types of (Mn, Si) oxides and complex in鄄 clusions of (Mn, Si, and Cr) oxysulfides are dissolved, which accelerates the corrosion process. However, the types of (Cr, Mn, and Al) oxides are stable in similar environment. The addition of manganese leads to the deterioration of the resistance of dplex stainless steel to pitting corrosion because manganese accelerates the formation of (Mn, Si) oxides that act as initial locations of pitting corrosion in chlorine ion corrosion environment. Dissolved inclusions help to expose fresh matrix to etchant solution, accelerating the corrosion of