组织配分对双相不锈钢微区极化行为及点蚀抗性的影响  

Effect of Microstructure Partition on Micro-polarization Behavior and Pitting Resistance of Duplex Stainless Steel

作　　者：汪毅聪 胡骞[1] 黄峰[1] 刘静[1] WANG Yicong;HU Qian;HUANG Feng;LIU Jing(State Key Laboratory of Refractories and Metallurgy,Hubei Engineering Technology Research Center of Materials and Service Safety,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学,省部共建耐火材料与冶金国家重点实验室,湖北省海洋工程材料及服役安全工程技术研究中心,武汉430081

出　　处：《中国腐蚀与防护学报》2021年第5期667-672,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51871171)。

摘　　要：通过固溶处理制备了具有不同基体组成相比例的2205双相不锈钢试样,利用宏观电化学测试和微区极化测试,结合腐蚀形貌分析研究了组织配分对2205双相不锈钢微区极化行为及点蚀抗性的影响,探讨了α和γ单相微区电化学活性对2205双相不锈钢点蚀抗性的影响机制。结果表明:固溶处理改变了合金元素在α和γ两相中的分配以及两相的占比,对两相的微区电化学活性及两相间的电偶效应产生影响。当α相占比为60.8%时,两相具有最高的自腐蚀电位、最低的自腐蚀电流密度和最弱的微电偶效应,此时2205双相不锈钢具有最高的点蚀抗性。2205 Duplex stainless steels(DSS)with different volume ratio of ferrite to austenite were prepared by solution treatment.Then their micro-polarization behavior and pitting resistance were studied by means of electrochemical measurement,micro-polarization measurement and corrosion morphology analysis.The effect of electrochemical activity of singleαandγphase on pitting resistance of 2205 DSS was also examined.Results show that the alloying element content and phase fraction of two phases changed after solution treatment,which influenced the micro-electrochemical activity of two phases and galvanic effect between two phases.When the phase fraction ofαis 60.8%,the steel of two phases showed the highest corrosion potential,the lowest corrosion current density and the weakest galvanic effect.The 2205 DSS,in this case,possesses the best pitting resistance.

关 键 词：双相不锈钢 点蚀 组织配分 微区极化 

分 类 号：TG174[金属学及工艺—金属表面处理]