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
肖人勇 1吴超 1贾海民 1童根 1龚道永 1吴娜荣2
作者信息
- 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
- 折叠
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0.036 00,存在晶间腐蚀可能性,316L晶间腐蚀敏感值为0.000 02,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.
Abstract
Intergranular corrosion cracking tendency of stainless steel cladding materials(304L,316L)after mono-lithic post-welding heat treatment was studied by electrochemical method in oil and gas field environment.The re-sults 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 de-termine 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 intergranu-lar corrosion characteristic curve appeared.It was verified by optical microscope that the material was mainly dam-aged 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Key words
oil and gas fields/stainless steel/heat treatment/intergranular corrosion/electrochemistry引用本文复制引用
基金项目
中石油塔里木油田公司科技项目(201022063414)
出版年
2024
NETL
NSTL
万方数据