某乙二醇厂乙二醇装置蒸发系统的封头直边处内、外表面出现大量裂纹。采用光谱仪、金相显微镜、扫描电镜和x射线衍射仪对该封头材料的成分、显微组织、腐蚀状况、裂纹进行了的分析。结果表明，封头材质为0Cr18Ni9不锈钢；内、外表面出现裂纹的原因是Cl-在封头直边处的形变马氏体组织中富集发生点蚀，进而引发材料的应力腐蚀开裂；马氏体的选择性溶解促进了裂纹扩展。据此提出了合理的热处理和选材建议。
A lots of cracks appeared on the internal and external surface of the straight flange in a condensate collector head of ethylene glycol device evaporation system. The composition, microstructure, corrosion situation and cracks of the head were analyzed by spectrometer, metallurgical microscopy, SEM and XRD. The results show that the material of the head is 0Cr18Ni9 stainless steel, and the cracks on the internal and external surface were attributed to the pitting caused by enriched C1- existing in the deformation martensite of the straight flange of the head. Subsequently, the Cl- pitting induced stress corrosion cracking of the material. In addition, the selective dissolution of martensite promoted the crack growth. According to the analyses, several reasonable suggestions about heat treatment and material selection were put forward.
参考文献
| [1] | 唐建群,张礼敬,巩建鸣.304不锈钢蒸发器开裂原因分析[J].腐蚀与防护,2003(04):179-182. |
| [2] | 黄新泉,赵恒庆,徐国良,李庆梅,孔朝晖,吴晓江.乙二醇蒸发塔裂纹腐蚀机理与对策调研[J].全面腐蚀控制,2004(06):31-34. |
| [3] | 朱晓东,艾志斌,李蓉蓉.1Cr18Ni9Ti不锈钢封头失效分析[J].压力容器,2004(06):38-42,31. |
| [4] | 黄新泉,李庆梅,赵恒庆,徐国良,孔朝晖,吴晓江.乙二醇蒸发塔裂纹原因与对策调研[J].腐蚀与防护,2005(06):274-276. |
| [5] | 李庆梅,赵恒庆,孙国豪,杨欣勃.乙二醇蒸发塔的晶间腐蚀[J].石油化工腐蚀与防护,2006(01):24-26. |
| [6] | 陈伟志,初宏革,王晧,郑启文.乙二醇装置T530零效蒸发器损伤分析和控制措施[J].压力容器,2007(04):45-50. |
| [7] | 邱先梅.乙二醇后部再沸器封头开裂原因和处理办法[J].河北化工,2009(11):53-55. |
| [8] | 胡久韶,王东,王丽银,程四祥,周斌.乙二醇装置多效蒸发器的腐蚀与选材[J].石油化工设备技术,2010(03):51-53. |
| [9] | 张麦秋,焦建雄.奥氏体不锈钢冷旋压封头的磁性成因分析[J].石油化工腐蚀与防护,2003(05):26-28. |
| [10] | 徐瑞芬.奥氏体不锈钢中马氏体含量对其钝化膜稳定性的影响[J].材料保护,1998(09):7. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%