长时热老化对Z3CN20-09M钢耐腐蚀性的影响  

Effect of Long-Term Thermal Ageing on Corrosion Resistance of Z3CN20-09M Steels

作　　者：曹楠 王正品[1] 王毓[1] 刘志学[1] 要玉宏[1] CAO Nan;WANG Zhengpin;WANG Yu;LIU Zhixue;YAO Yuhong(School of Materials and Chemical Engineering,Xi’an Technological University,Xi’an 710021,China)

机构地区：[1]西安工业大学材料与化工学院,西安710021

出　　处：《西安工业大学学报》2018年第6期614-619,共6页Journal of Xi’an Technological University

基　　金：国家自然科学基金(51371132);陕西省教育厅重点实验室资助项目(15JS038);陕西省光电功能材料与器件重点实验室开放基金(2015SZSj-59-7)

摘　　要：为了研究核电站一回路管道用钢Z3CN20-09M在服役过程中的腐蚀行为,采用电化学工作站研究了Z3CN20-09M不锈钢在350℃、16.5 MPa含硼离子水蒸气和350℃空气介质中长时热老化后的电化学腐蚀性能.结果表明:随着热老化时间的延长,经两种介质热老化后Z3CN20-09M双相不锈钢腐蚀电位减小,腐蚀电流密度增加,Nyquist曲线半径逐渐减小,表明Z3CN20-09M钢经两种介质热老化后表面钝化膜稳定性变差,腐蚀速率加快,耐腐蚀性下降.在相同热老化时长下,经350℃、16.5 MPa水蒸气热老化Z3CN20-09M钢的腐蚀速率要比350℃空气介质热老化的大.The paper discusses the corrosion behavior of Z3CN20-09M steel used for the primary circuit pipeline in a nuclear power plant.The electrochemical corrosion properties of Z3CN20-09M steel in 0.1 M HCI solution were studied by the electrochemical workstation after its long thermal aging in 350 ℃ and 16.5 MPa boron ion water vapor and in a 350 ℃ air medium.The results showed that with the increase in thermal aging time,the corrosion potential and Nyquist curve radius of Z3CN20-09M steel decreased,and the corrosion current density increased,indicating that the stability of the passive film of thermally aged Z3CN20-09M steel became worse,the corrosion rate increased and the corrosion resistance decreased.The corrosion rate of Z3CN20-09M steel thermally aged in 350 ℃ and 16.5 MPa water vapor was greater than that in 350 ℃ air medium.

关 键 词：Z3CN2009M不锈钢 热老化 电化学 腐蚀性能 

分 类 号：TG142.71[一般工业技术—材料科学与工程]