油气田环境用不锈钢容器的腐蚀倾向  

Corrosion tendency of stainless steel vessel in oil and gas field environment

作　　者：肖人勇 吴超 贾海民 童根 龚道永 吴娜荣 XIAO Renyong;WU Chao;JIA Haimin;TONG Gen;GONG Daoyong;WU Narong(Oil and Gas Engineering Research Institute of Tarim Oilfield Company,Korla 841000,Xinjiang,China;Machinery Industry Shanghai Lanya Petrochemical Equipment Testing Co.,Ltd.,Shanghai 201613,China)

机构地区：[1]塔里木油田公司油气工程研究院,新疆库尔勒841000 [2]机械工业上海蓝亚石化设备检测所有限公司,上海201613

出　　处：《金属功能材料》2024年第4期62-66,共5页Metallic Functional Materials

基　　金：中石油塔里木油田公司科技项目“超设计开发年限油气田压力容器服役性能评估方法研究”(201022063414)。

摘　　要：针对经整体焊后热处理的不锈钢覆层材料(304L、316L),采用电化学方法对其在油气田环境中的晶间腐蚀开裂倾向进行了研究。研究结果表明,在模拟环境中,材料的开路电位较自腐蚀电位正,无外加电位情况下即存在腐蚀可能性;经双环电化学动电位法测定标准溶液中的304L晶间腐蚀敏感值为0.03600,存在晶间腐蚀可能性,316L晶间腐蚀敏感值为0.00002,无敏感性;为确定材料在实际工况下的敏感性,采用相同方法进行在模拟环境中测定,发现两材料始终处于活化状态,无晶间腐蚀特征曲线出现。经光学显微镜验证,材料以点腐蚀损伤为主,无晶间腐蚀开裂敏感性。在容器定期检验、RBI检验中也无需考虑晶间腐蚀开裂性。Intergranular corrosion cracking tendency of stainless steel cladding materials(304L,316L) after monolithic post-welding heat treatment was studied by electrochemical method in oil and gas field environment.The results show that in the simulated environment,the open circuit potential of the material is more positive than the self-corrosion potential,and there is a possibility of corrosion in the absence of applied potential.The sensitivity value of 304L intergranular corrosion in standard solution measured by double-loop electrochemical potentiodynamic method is 0.036 0,there is possibility of intergranular corrosion,316L is 0.000 02,there is no sensitivity.In order to determine the sensitivity of the materials under actual working conditions,the same method was used to measure in the simulated environment,and it was found that the two materials were always in the activated state and no intergranular corrosion characteristic curve appeared.It was verified by optical microscope that the material was mainly damaged by point corrosion,and there was no sensitivity to intergranular corrosion cracking,and intergranular corrosion cracking did not need to be considered in the periodic inspection of containers and RBI inspection.

关 键 词：油气田 不锈钢 热处理 晶间腐蚀 电化学 

分 类 号：TE980[石油与天然气工程—石油机械设备]