摘要
Abstract
The pitting corrosion is the main reason for the failure of petroleum tubular goods.In this article,by the electrochemical test and chemical immersion method,it studied the pitting corrosion behavior of super 13Cr casing and tubing steel to provide the basis for research and development.The results showed that Cl-and temperature are the main influence factors for pitting corrosion of super 13Cr,with Cl-concentration and temperature increasing,the pitting corrosion sensitivity increases.The critical pitting temperature is respectively 40.5 ℃ and 37.5 ℃,by the electrochemical test and chemical immersion method,the difference is 3 ℃.When the temperature is below the CPT,13Cr steel is in equilibrium state of breaking inactivation and repassivation,few,small and shallow pitting dents form on material surface; when the temperature is above CPT,many,big and deep dents appear,so the pitting entirely happen.关键词
油井管/油套管/超级13Cr钢/点蚀/临界点蚀温度Key words
oil well pipe/ casing and tubing/ super 13Cr steel/ pitting corrosion/ critical pitting temperature分类
能源科技
