P110SS钢在H_2S和CO_2环境中的腐蚀特征

Corrosion characterization of P110SS steel in the environment containing H_2S and CO_2

利用高温高压哈氏合金反应釜对P110SS油套管钢在不同H2S和CO2环境下的腐蚀行为进行了实验。研究了H2S和CO2分压对P110SS油套管钢腐蚀规律的影响,利用SEM、EDS、XRD等方法分析了腐蚀试样的微观形貌与结构特征,发现P110SS在较低温度条件下,H2S浓度非常低时,腐蚀特征与单纯CO2腐蚀规律相似,腐蚀速率比较高。在相同的H2S分压条件下,随CO2浓度增加,腐蚀速率依次增加。通过应力腐蚀开裂试验表明,P110SS在高温205℃条件下应力腐蚀开裂敏感较小。

Corrosion behavior of P110ss tubing and casing steel was tested through simulation of actual corrosion environment containing H2 S and CO2 in a autoclave. The effect of partial pressure of H2S and CO2 on the corrosion behavior of P110SS steel was investigated. Scanning eleetrou microscopy, X-ray diffraction and energy dispersive spectrometer technique were used to analyze the micro-morphology and microstmcture. The results indicate that the corrosion rate of P110SS steel is relatively high under conditions with very low H2 S partial pressure and at lower temperature （80℃）. The stress corrosion cracking test suggests that P110SS is not sensitive to stress corrosion cracking in the environment with high partial pressure of HE S and CO： at high temperature （205℃）.