不同硫化物浓度碱性溶液中16Mn钢及热影响区应力腐蚀行为_郝文魁.pdfVIP

网络出版时间：2013-08-26 14:29 网络出版地址：/kcms/detail/11.1946.TQ1429.001.html 不同硫化物浓度碱性溶液中16Mn 钢及热影响区应力腐蚀行为 郝文魁 刘智勇 杜翠薇 李晓刚 (北京科技大学腐蚀与防护中心, 北京 100083) 摘要：利用U 形弯试样浸泡试验和电化学技术研究了16Mn 钢及其模拟热影响区在不同硫化物浓度的碱性(pH=11.7)介质中 的应力腐蚀开裂( SCC) 行为与机理。结果表明：16Mn 钢原始组织、粗晶组织（空冷组织）和硬化组织（淬火组织）在碱性 硫化物环境中均能形成保护性腐蚀产物膜、导致电极过程近似呈钝化状态，钝化电流密度依次降低；淬火组织析氢电流密度 较高，腐蚀速度较低，长期服役后会造成靠近熔合线部分腐蚀深度大而暴露出残余拉应力区，引起SCC；HAZ 中硬化组织、 粗晶组织和原始组织在碱性硫化物环境下SCC 敏感性逐渐降低，硬化组织具有较明显的SCC 敏感性，粗晶组织和原始组织 SCC 敏感性小；硫化物浓度升高，16Mn 钢及其模拟热影响区SCC 敏感性增加；16Mn 钢焊缝区在碱性硫化物环境中SCC 裂纹扩展机制为阳极溶解机制。 关键词：16Mn钢；硫化物；碱性；应力腐蚀；腐蚀 中图分类号：TG 172.4 文献标志码：A 文章编号：0438-1157 （2006 ）00-0000-00 Stress corrosion cracking behavior of 16Mn steel and heat-affected zone in alkaline sulfide with different concentrations HAO Wenkui, LIU Zhiyong, DU Cuiwei, LI Xiaogang (Corrosion and Protection Center, University of Science and Technology Beijing, Beijing, 100083，China) Abstract ：This research aims to study the stress corrosion cracking (SCC) behavior and its mechanism of 16Mn steel and heat-affected zone in alkaline (pH=11.7) sulfide solution with different concentrations using electrochemical technology and U-bent specimen immersing test. Original structure, coarse grain structure (air cooling structure) and hardening structure (quenching structure) turned into the state of passivation in alkaline sulfide solution, and the current density of passivation decreased gradually. The current density of hydrogen evolution of hardening organization was higher and corrosion rate was slower. And the corrosion near the fusion line part was deeper and the residual tensile stress ar