P110钢在元素硫沉积环境中的腐蚀过程探讨  

Corrosion Process of P110 Steel Pipe and Casing Steel in the Environment of Sulfur Deposition

作　　者：蔡晓文 戈磊[2] 黄富[3] 史志新[1] 

机构地区：[1]攀钢集团攀枝花钢铁研究院有限公司钒钛资源综合利用国家重点实验室,四川攀枝花617000 [2]中国石油大学(北京)材料科学与工程系,北京102249 [3]中国石油四川石化有限责任公司生产一部,四川成都611930

出　　处：《材料科学与工程学报》2014年第3期402-407,430,共7页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(50601029;50771104)

摘　　要：实验模拟了普光气田元素硫沉积环境,利用SEM、EDS等技术研究了腐蚀产物膜的截面元素分布及腐蚀产物膜的形貌和成分,分析了P110钢在该环境中的腐蚀过程。结果表明:P110钢首先发生氧化腐蚀,进而发生硫化腐蚀。由于含硫离子对P110钢腐蚀电位的影响,Cl-表现出较强的侵蚀性,它借助硫化物膜向腐蚀产物膜的内层扩散,并在基体界面发生点蚀。同时,S2-通过腐蚀产物膜向内扩散,在氧化物膜与硫化物膜之间形成新的硫化物膜。The downhole environment of PUGUANG gas filed was experimentally simulated,and the elements distribution and morphology of the cross-section of the corrosion scales were analyzed by SEM and EDS.The corrosion process of P110steel pipe was then analyzed.The results showed that the oxidation took place at first,and then the vulcanization reaction occurred.Cl-became more aggressive because of the effects of some sulfur ions,and Cl-diffused through oxides,which leaded to pitting on the matrix.At the same time,the formation of sulfides between oxides and sulfides depended on the diffusion of S2-through the corrosion scales.

关 键 词：元素硫 硫沉积 歧化反应 液相 点蚀 

分 类 号：TG172[金属学及工艺—金属表面处理]