(NH4)2SO4管线开裂失效的原因  

The Cracking Failure Reason of Ammonium Sulfate Pipeline

作　　者：陈维 CHEN Wei(Shanghai Secco Petrochemical Co.,Ltd.,Shanghai Chemical Industry Zone,Shanghai 201507,China)

机构地区：[1]上海市化学工业区上海赛科石油化工有限责任公司,上海201507

出　　处：《腐蚀与防护》2020年第11期75-78,共4页Corrosion & Protection

摘　　要：通过PT、化学成分分析、形貌观察等方法,分析了(NH4)2SO4管线的开裂原因。结果表明,在海洋大气与工业大气复合的环境中,当保温层发生破损时,外壁温度为80~95℃、因外界引入含Cl^-物质,未涂覆涂层的316L管线外壁极易发生不规则的"树枝状"外部氯离子致应力腐蚀开裂(ESCC)。Through PT,chemical composition analysis,morphology observation and other methods,the reasons for the cracking of an(NH4)2SO4 pipeline were analyzed.The results show that in a composite environment of marine atmosphere and industrial atmosphere,when the insulation layer was damaged,the temperature of the outer wall of the pipeline was 80~95℃,the outer wall of uncoated 316 Lpipeline was prone to irregular"dendritic"ESCC(external chloride stress corrosion cracking)due to the introduction of Cl-containing substances.

关 键 词：316L不锈钢 (NH4)2SO4 ESCC 失效分析 扫描电镜 

分 类 号：TG172.[金属学及工艺—金属表面处理]