不锈钢硝酸输送管道焊缝的腐蚀失效原因

发布时间：2018-03-03 02:36

本文选题：硝酸　切入点：焊缝　出处：《腐蚀与防护》2017年05期 　论文类型：期刊论文

【摘要】：通过化学成分分析、扫描电镜观察、能谱分析等方法,研究了硝酸管道焊缝腐蚀失效的原因。结果表明:304不锈钢硝酸管道在焊缝的腐蚀失效主要发生在焊缝热影响区,出现晶间腐蚀,沿热影响区出现刀口状腐蚀沟槽。三通母材的含碳量高于标准值,导致三通侧的管材在焊接过程中,其热影响区更容易发生敏化,晶粒粗大,导致耐蚀性下降。碳含量是影响304不锈钢焊接接头在硝酸中耐蚀性的关键因素,碳含量越高,焊接过程中热影响区的不锈钢越容易发生敏化,导致其耐蚀性显著降低。
[Abstract]:By means of chemical composition analysis, scanning electron microscope observation and energy dispersive analysis, the causes of corrosion failure of nitric acid pipe weld are studied. The results show that the corrosion failure of the stainless steel nitric acid pipe in the weld mainly occurs in the heat-affected zone of the weld. The carbon content of the base metal is higher than the standard value, which results in the heat affected zone is more sensitive and the grain size is coarse during the welding process of the tube. Carbon content is the key factor that affects corrosion resistance of 304 stainless steel welded joint in nitric acid. The higher the carbon content, the easier sensitization of stainless steel in heat affected zone during welding process, which results in a significant decrease in corrosion resistance of 304 stainless steel welded joint.
【作者单位】：北京化工大学;中国石油吉林石化公司检测中心;
【基金】：北京市与中央高校共建项目
【分类号】：TG457.11;TQ111.2

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