气压机入口管线法兰焊缝腐蚀失效分析  

Corrosion failure analysis on the welding line of gas compressor inlet pipeline flange

作　　者：付亮 Fu Liang(College of Intelligent Manufacturing,Jilin Vocational College of Industry and Technology,Jilin 132013,China)

机构地区：[1]吉林工业职业技术学院智能制造学院,吉林吉林132013

出　　处：《电镀与精饰》2023年第6期67-72,共6页Plating & Finishing

基　　金：2021年度吉林省职业教育与成人教育教学改革研究课题:产教融合背景下吉林省高职院校双师型师资队伍建设研究(2021ZCY108)。

摘　　要：对失效部位试样的化学成分、金相组织和显微硬度进行研究,通过扫描电镜、能谱分析和X射线衍射分析失效工件的腐蚀产物形貌和腐蚀产物组成,选用S^(2-)溶液和S^(2-)、Cl^(-)混合溶液对试样进行电化学腐蚀对比实验。结果表明:气压机管线法兰焊缝腐蚀原因是法兰材质不符合标准,法兰与短接管的焊缝属于异种金属不等壁厚焊接,导致焊缝耐腐蚀性下降,在潮湿环境中与硫化物、氯化物等腐蚀介质发生综合作用,焊缝发生快速腐蚀,导致气压机管线法兰焊缝腐蚀、失效。The chemical composition,metallographic structure and microhardness of the failure parts samples were studied and the morphology and composition of corrosion products were analyzed by scanning electron microscope,energy spectrum analysis and X-ray diffraction test.The electrochemical behavior of the samples in different electrolyte was used to carry out the electrochemical corrosion comparison test,and the electrolyte was S^(2-)solution and S^(2-),Cl^(-)mixed solution,respectively.The results show that the reason for the corrosion of the flange weld is that the material of the flange does not meet the standard,and the weld of the flange and short pipe is dissimilar materials and unequal wall welding,which leads to the decrease of the corrosion resistance of the weld.Under the humid environment,the comprehensive interaction of weld with sulfide,chloride and other corrosive media,the corrosion of weld occurs rapidly,which resulting in the corrosion and failure of pneumatic pipeline flange.

关 键 词：管线法兰 腐蚀失效 电化学腐蚀 

分 类 号：TG172.2[金属学及工艺—金属表面处理]