油气集输用X70管线钢CO2腐蚀行为研究.pdfVIP

油气集输用 X70 管线钢 CO 腐蚀行为研究1 2 王立东 唐 荻 武会宾 （北京科技大学冶金工程研究院，北京 100083 ） 摘 要 利用高温高压反应釜模拟油田多相流腐蚀环境，对 X70 管线钢 CO 腐蚀行为进行了研究。采用失重法计 2 算腐蚀速率，利用 SEM、XRD 、EDS 等手段观察和分析了腐蚀产物膜的形貌、结构和成分。结果表明：随着腐 蚀环境温度的升高，X70 管线钢平均腐蚀速率和点蚀速率的变化趋势均呈现先增大后减小的趋势，在 60℃时平均 腐蚀速率达到最大值，而温度在 90℃时点蚀速率达到最大值；基体中的 Cr 容易生成 Cr2O3 在金属表面沉积，可 以有效阻碍阴离子穿透腐蚀产物膜到达金属表面，大大减少Cl-导致的点蚀。 关键词 管线钢 CO2 腐蚀 腐蚀产物膜 Study on CO Corrosion Behavior of X70 Pipeline 2 Steels Used for Gathering and Transportation Wang Lidong Tang Di Wu Huibin （Metallurgical Engineering Research Institute ,University of Science and Technology Beijing, Beijing, 100083） Abstract The oil-water-gas multiphase flow environment was simulated in a high temperature and high pressure autoclave to study the CO2 corrosion behavior of X70 pipeline steel. The corrosion rate of the steel was calculated by the mass-loss method, and the micrograph, microstructure and component of the corrosion scales were observed and analyzed by scanning electron microscopy, energy dispersive spectrometer and X-ray diffraction techniques. The results show that with the increase of environmental temperature the average and pitting corrosion rates of X70 steel first increased then decreased. Cr exists mainly as amorphous compound Cr2O3 in specific layer of the corrosion scales which can hinder anionic to penetrate corrosion products and reach metal matrix, that reduce the pitting corrosion which Cl- led to . Key words pipeline steel, CO corrosion, corrosion product scale