中国特种设备安全
中國特種設備安全
중국특충설비안전
CHINA SPECIAL EQUIPMENT SAFETY
2014年
4期
73-77
,共5页
焊缝%晶间腐蚀%应力腐蚀
銲縫%晶間腐蝕%應力腐蝕
한봉%정간부식%응력부식
Welding seam%Intergranular corrosion%Stress corrosion
某催化剂分子筛装置的奥氏体不锈钢焊缝腐蚀主要集中在交换罐，其材质为1Cr18Ni9Ti或0Cr18Ni9Ti，罐体焊缝腐蚀的部位主要集中在罐底部。在环纵焊缝邻近处液面以下,交换罐在运行期间多处发生微裂纹渗漏现象,渗漏多发生在焊接热影响区，母材中也有发生。本文通过交换罐内腐蚀介质的分析、焊接件的耐蚀性评价、失效分析等实验，分析出腐蚀原因主要是由酸性条件下Cl-引起的晶间腐蚀、应力腐蚀开裂，并从焊缝焊接技术的改进、焊缝的防腐表面处理及新罐的选材等几方面提出相关防腐建议。
某催化劑分子篩裝置的奧氏體不鏽鋼銲縫腐蝕主要集中在交換罐，其材質為1Cr18Ni9Ti或0Cr18Ni9Ti，罐體銲縫腐蝕的部位主要集中在罐底部。在環縱銲縫鄰近處液麵以下,交換罐在運行期間多處髮生微裂紋滲漏現象,滲漏多髮生在銲接熱影響區，母材中也有髮生。本文通過交換罐內腐蝕介質的分析、銲接件的耐蝕性評價、失效分析等實驗，分析齣腐蝕原因主要是由痠性條件下Cl-引起的晶間腐蝕、應力腐蝕開裂，併從銲縫銲接技術的改進、銲縫的防腐錶麵處理及新罐的選材等幾方麵提齣相關防腐建議。
모최화제분자사장치적오씨체불수강한봉부식주요집중재교환관，기재질위1Cr18Ni9Ti혹0Cr18Ni9Ti，관체한봉부식적부위주요집중재관저부。재배종한봉린근처액면이하,교환관재운행기간다처발생미렬문삼루현상,삼루다발생재한접열영향구，모재중야유발생。본문통과교환관내부식개질적분석、한접건적내식성평개、실효분석등실험，분석출부식원인주요시유산성조건하Cl-인기적정간부식、응력부식개렬，병종한봉한접기술적개진、한봉적방부표면처리급신관적선재등궤방면제출상관방부건의。
A zeolite catalyst unit faced the corrosion of austenitic stainless steel welds which concentrated in the ion-exchange vessel, the material applied are 1Cr18Ni9Ti or 0Cr18Ni9Ti, weld corrosion are mainly concentrated at the bottom of the vessels. At the central and longitudinal weld adjacent below the liquid level of ion-exchangers, multiple micro-cracks leakage were found in the vessels running, leakage occurred mainly in the welding heat-affected zone, and also in the base material. After experiments including the corrosion medium analysis of exchangers, evaluation of corrosion resistance of welded parts and failure analysis, it concluded that corrosion causes were that Cl- under acidic conditions results in inter-granular corrosion and stress corrosion cracking. Welding technology improvement, anti-corrosion surface treatment and material aspects for anticorrosion are recommended in the article.
