文献类型：期刊文献

中文题名：氯离子对316L不锈钢在连多硫酸中应力腐蚀的影响

英文题名：EFFECT OF CHLORIDE ION ON STRESS CORROSION CRACKING OF TYPE 316 AUSTENITIC STAINLESS STEEL IN POLYTHIONIC ACID SOLUTION

作者：黄志荣[1];马刘宝[1];王宝功[1]

机构：[1]华东理工大学机械工程学院,上海200237

年份：2005

卷号：26

期号：4

起止页码：147

中文期刊名：腐蚀与防护

外文期刊名：Corrosion & Protection

收录：CSTPCD;;Scopus;北大核心:【北大核心2004】；

语种：中文

中文关键词：应力腐蚀破裂;奥氏体不锈钢;连多硫酸

外文关键词：Stress corrosion cracking; Austenitic stainless steel; Polythionic acid

摘要：用恒变形U形弯曲试样应力腐蚀试验研究了长期服役在650～720℃下的316L奥氏体不锈钢室温下在0.38mol/L连多硫酸溶液及0.38mol/L连多硫酸+0.5mg/LNaCl溶液中的应力腐蚀破裂(SCC)行为。采用金相显微镜(OM)、扫描电子显微镜(SEM)对裂纹形态、断口形貌进行观察和分析。结果表明,该钢在0.38mol/L连多硫酸溶液中没有发生应力腐蚀破裂现象,而在0.38mol/L连多硫酸+0.5mg/LNaCl溶液中发生了应力腐蚀破裂,裂纹扩展为混合型,氯离子对钢表面钝化膜的破坏是诱发应力腐蚀破裂的主要原因之一。
Stress corrosion cracking (SCC) behaviors of 316L austenitic stainless steel which had served at 650～720℃ for long time were studied by using U-bend samples in 0.38mol/L polythionic acid and 0.38mol/L polythionic +0.5mg/L sodium chloride solution at ambient temperature, respectively. Cracks and fracture morphology were observed and analyzed using optical microscope (OM) and scanning electron microscope (SEM). The results showed that the 316L steel did not exhibit SCC in 0.38mol/l polythionic acid but showed cracking in 0 38mol/L polythionic + 0.5mg/L sodium chloride solution. The crack propagation pathes were both transgranular and intergranular. The destruction of passivation film formed on the surface due to chloride ions should be one of the main causes of stress corrosion crack initiation.