水含量对超临界CO_(2)输送管道腐蚀的影响  

Effect of Water Content on Corrosion Behavior of X65 Pipeline Steel in Supercritical CO_(2)Fluids

作　　者：胡丽华 衣华磊 杨维健 孙冲 孙建波 HU Lihua;YI Hualei;YANG Weijian;SUN Chong;SUN Jianbo(CNOOC Research Institute Co.,Ltd.,Beijing 100028,China;School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中海油研究总院有限责任公司,北京100028 [2]中国石油大学(华东)材料科学与工程学院,青岛266580

出　　处：《中国腐蚀与防护学报》2024年第3期576-584,共9页Journal of Chinese Society For Corrosion and Protection

基　　金：中海油“十四五”重大科研项目(KJGG-2022-12-CCUS-0103)。

摘　　要：通过模拟实验和表面分析技术等方法,对比研究有无杂质的超临界CO_(2)输送环境中水含量对X65管线钢腐蚀行为的影响,并探讨不同水含量环境中杂质对X65钢腐蚀的影响机理。结果表明:在超临界CO_(2)-H_(2)O环境中,即使水含量达到饱和溶解度0.4114%,X65钢也仅发生轻微腐蚀,腐蚀速率为0.0013 mm/a。在O_(2)、H_(2)S、SO_(2)和NO_(2)杂质共存的超临界CO_(2)-H_(2)O环境中,水含量由0.002%增加至0.4114%,X65钢腐蚀速率由0.0181 mm/a增加至0.2901 mm/a。杂质与杂质间交互作用显著促进腐蚀性液相形成,进而加剧X65钢的腐蚀。在低含水量环境中,X65钢腐蚀过程由杂质间反应产物控制;而在高含水量环境中,杂质和杂质间反应产物共同控制X65钢的腐蚀过程。CO_(2)induced pipeline corrosion is one of main concerns for the safe implementation and large-scale application of Carbon Capture,Utilization and Storage(CCUS)technology.Reasonably limiting the water content in supercritical CO_(2)transport environments containing multiple impurities is crucial for the corrosion control of the pipeline.Herein,the effect of water content on the corrosion behavior of X65 pipeline steel in supercritical CO_(2)transport environments with/without impurities of O_(2),H_(2)S,SO_(2) and NO_(2) was investigated by means of simulated corrosion test with high-temperature and high-pressured autoclave,and surface analysis technology.Concurrently,the influence mechanism of impurities on the corrosion of the steel in supercritical CO_(2)transport environments with different water contents was discussed.The results show that X65 steel only undergoes slight corrosion in supercritical CO_(2)-H_(2)O environment even if the water content reaches a saturated solubility of 0.4114%,and the corrosion rate is 0.0013 mm/a.However,when O_(2),H_(2)S,SO_(2) and NO_(2) coexist in supercritical CO_(2)-H_(2)O environment,the corrosion rate of X65 steel increases from 0.0181 mm/a to 0.2901 mm/a as the water content varies from 0.002%to 0.4114%.The impurities and their interactions significantly promote the formation of corrosive aqueous phase,therefore exacerbating the corrosion of X65 steel.The corrosion process of X65 steel in the environment with low water content is controlled by the products of impurity reactions,whereas the impurities and the products of impurity reactions jointly dominate the corrosion process of the steel in the environment with high water content.

关 键 词：X65 管线钢 超临界CO_(2) 水含量 杂质 腐蚀 

分 类 号：TG178[金属学及工艺—金属表面处理]