摘要
采用失重法和电化学测试方法,研究了Q345R容器用钢在模拟核桃壳过滤器不同环境中的腐蚀行为。结果表明:在CO_2+溶解氧及CO_2/H_2S+溶解氧环境中,Q345R钢的腐蚀速率随温度升高,先增大,后减小;在H_2S+溶解氧的环境中,Q345R钢的腐蚀速率随温度升高逐渐增大。在CO_2/H_2S+溶解氧环境中,Q345R钢的电化学腐蚀倾向相对较小,电化学腐蚀动力学阻力最大,抗腐蚀性能相对最好;在CO_2+溶解氧及H_2S+溶解氧环境中,Q345R钢的电化学腐蚀倾向相近,电化学腐蚀动力学阻力相差不大,抗腐蚀性能相对较差。由此可见,Q345R钢的耐蚀性能对服役环境敏感。
Inner components made of steels was frequently suffered from corrosion failure for walnut shell filters in a domestic oilfield. Therefore, corrosion behavior of Q345R steel in artificial highly mineralized waters, which aims to simulate waters encountered in walnut shell filters, was studied by means of weight loss measurement and electrochemical testing methods. Results show that the corrosion rate of Q345R steel increases first and then decreases with the increase of temperature in the dissolved oxygen containing water with CO2 and CO2/H2S respectively. However, the corrosion rate of Q345R steel gradually increases with increasing temperature in dissolved oxygen containing water with H2S. In the dissolved oxygen containing water with CO2/H2S, Q345R steel presents relatively small electrochemical corrosion tendency, the largest electrochemical corrosion dynamics resistance and the best corrosion resistance.On the contrary, in the dissolved oxygen containing water with CO2 or H2S respectively, the Q345R steel presents more or less the same level for electrochemical corrosion tendency and electrochemical corrosion dynamics resistance, but relatively poor corrosion resistance. This implies that the corrosion resistance of the Q345R steel is sensitive to the service environment.
作者
赵国仙
王园园
路永新
ZHAO Guoxian, WANG Yuanyuan, LU Yongxin(School of Materials Science and Engineering, Xi＇an Shiyou University, Xi＇an 710065, China)
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2018年第5期467-474,共8页
Corrosion Science and Protection Technology
基金
国家自然科学基金(51271146)
西安石油大学<材料科学与工程>省级优势学科项目~~
关键词
Q345R钢
核桃壳过滤器
模拟环境
腐蚀行为
极化曲线
电化学阻抗谱
Q345R steel
walnut shell filter
simulation environment
corrosion behavior
polarizationcurves
electro-chemical impedance spectroscopy
