CO_(2)环境下温度梯度对13Cr马氏体不锈钢腐蚀行为的影响  

Influence of Temperature Gradients on Corrosion Behavior of 13Cr Martensitic Stainless Steel in CO_(2)Environment

作　　者：赵国仙[1,2] 李佳豪 ZHAO Guoxian;LI Jiahao(College of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China;Xi'an Maurer Petroleum Engineering Laboratory Co.,Ltd.,Xi'an 710065,China)

机构地区：[1]西安石油大学材料科学与工程学院,西安710065 [2]西安摩尔石油工程实验室股份有限公司,西安710065

出　　处：《焊管》2025年第4期38-46,53,共10页Welded Pipe and Tube

摘　　要：针对油气田高温高压CO_(2)环境中13Cr马氏体不锈钢局部腐蚀的问题,在CO_(2)总压为15 MPa,70℃、100℃、130℃条件下开展模拟工况、电化学腐蚀试验,并通过分析腐蚀形貌、产物膜特性、电化学特性等方法研究其腐蚀行为。结果表明,13Cr马氏体不锈钢在70℃、100℃、130℃温度下为轻度腐蚀,点蚀为中度腐蚀,同时腐蚀速率随温度升高而上升;随着温度升高腐蚀产物膜增厚,Cr元素富集加剧,Cr(OH)_(3)减少、Cr_(2)O_(3)增加,氧化物保护膜功能逐渐减弱。动电位极化曲线、电化学阻抗谱及Mott-Schottky曲线分析表明,温度升高明显加速了腐蚀进程。To investigate the localized corrosion of 13Cr martensitic stainless steel in the high-temperature and high-pressure CO_(2)environments in the oil and gas fields,the simulated working conditions and the electrochemical corrosion tests were carried out under a total CO_(2)pressure of 15 MPa and at the temperatures of 70℃,100℃,and 130℃.The corrosion behaviors were studied by analyzing the corrosion morphology,the product film characteristics,the electrochemical properties,and other methods.The results showed that the slight corrosion occurred under the temperature of 70℃,100℃,130℃partly,pitting corrosion was of moderate degree and the corrosion rate increased along with the rise in temperature.As the temperature increased,the corrosion product film became thicker,thereby resulting in a more pronounced enrichment of chromium.Concurrently,the concentration of Cr(OH)_(3)diminished while that of Cr_(2)O_(3)increased.The effectiveness of the oxide protective film gradually declined.The test results of potentio dynamic polarization curves,electrochemical impedance spectroscopy,and Mott-Schottky curves showed that the increase in the temperature accelerated the corrosion process.

关 键 词：13Cr马氏体不锈钢 CO_(2) 温度 腐蚀行为 钝化膜 电化学 

分 类 号：TG174[金属学及工艺—金属表面处理]