N80油套管钢CO_2腐蚀产物膜特征  

CHARACTERS OF CO_2 CORROSION SCALES ON WELL TUBE STEELS N80

作　　者：陈长风[1] 路民旭[1] 赵国仙[1] 白真权[1] 严密林[1] 杨延清[2] 

机构地区：[1]中国石油天然气集团公司管材研究所,西安710065 [2]西北工业大学材料科学与工程学院,西安710072

出　　处：《金属学报》2002年第4期411-416,共6页Acta Metallurgica Sinica

基　　金：国家重点基础研究发展规划项目 G19990650;中国石油天然气集团公司石油管力学和环境行为重点实验室基金项目资助~~

摘　　要：在模拟的油田高温高压现场环境下研究了普通 Ｎ８０级油套管钢和含 ４％－５％Ｃｒ的 Ｎ８０油套管钢 ＣＯ２腐蚀产物膜结构和离子选择性特征．结果表明、普通 Ｎ８０油套管钢形成的 ＦｅＣＯ３腐蚀产物膜具有阴离子选择透过性、这种特征对基体保护性较差．丘容易诱发点蚀：含 ４％－５％Ｃｒ的 Ｎ８０油套管钢形成的 Ｃｒ（ＯＨ）３非晶态腐蚀产物膜具有阳离子选择透过性，它不仅可以显著降低腐蚀速率．而且可以抑制点蚀的发生。In the simulating oilfield downhole corrosive environment with high temperature-high pressure, the structure characteristics and ion selectivity of the CO2 corrosion scale on general N80 steel and 4%-5%Cr N80 steel were studied. The experimental results indicated that the FeCO3 corrosion scale formed on the general N80 steel surface has anion-passing-selectivity, which could not protect matrix effectively and would enhance the formation of pitting, and the amorphous compound Cr(OH)(3) film formed on the 4%-5%Cr containing N80 steel surface has cation-passing-selectivity, which could not only reduce the corrosion rate but also prevent the formation of pitting.

关 键 词：油套管钢 腐蚀产物膜 离子选择性 二氧化硫腐蚀 

分 类 号：TE988.2[石油与天然气工程—石油机械设备]