304不锈钢在模拟循环冷却水中应力腐蚀破裂的临界Cl^-浓度  

Critical Cl^- Concentration of Stress Corrossion Cracking for 304 Stainless Steel in Simulated Circular Cooling Water

作　　者：程海东[1] 许淳淳[1] 吕国诚[1] 曲秀华[1] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029

出　　处：《腐蚀与防护》2008年第11期674-677,共4页Corrosion & Protection

基　　金：中石化项目"三级炼油外排污水回用循环水成套技术开发"(306021)

摘　　要：采用慢应变速率法和恒应变原位电化学测试法研究了304不锈钢在60℃的模拟循环冷却水中,氯离子对其耐蚀性能的影响。结果表明:Cl^-浓度小于600 mg/L时,随着Cl^-浓度的增加,膜破裂电位迅速负移,点蚀敏感性增大,未发生应力腐蚀破裂;Cl^-浓度大于600 mg/L时,随着Cl^-浓度的增加,膜破裂电位较负且变化缓慢,应力腐蚀破裂敏感性增大。The effect of Cl^- on the corrosion resistance of 304 stainless steel in simulated circular cooling water at 60℃ was studied by means of in-situ electrochemical tests under constant strain condition and slow strain rate tests （SSRT）. When Cl^- concentration was below 600 mg/L, the pitting potentials evolved towards negative sharply and the pitting corrosion susceptibility increased with the increase of Cl^- concentration; While above 600 mg/L, the pitting potentials shifted towardsnegative slowly and the stress corrosion cracking （SCC） susceptibility increased with the increase of Cl^- concentration.

关 键 词：304不锈钢 模拟循环冷却水 膜破裂电位 应力腐蚀破裂 临界Cl^-浓度 

分 类 号：TG172.6[金属学及工艺—金属表面处理]