CO_2压力对金属腐蚀产物膜形貌结构的影响  

EFFECT OF CO_2 PARTIAL PRESSURE ON THE MORPHOLOGY OF CORROSION METALLIC PRODUCT SCALES

作　　者：林冠发[1] 白真权[1,2] 赵国仙[1,2] 赵新伟[1,2] 郑茂盛[1] 路民旭[3] 

机构地区：[1]西安交通大学材料科学与工程学院 [2]中国石油天然气集团公司管材研究所西安710065 [3]北京科技大学材料科学与工程学院

出　　处：《中国腐蚀与防护学报》2004年第5期284-288,共5页Journal of Chinese Society For Corrosion and Protection

基　　金：国家 973项目 (G19990 65 0 0 4);国家自然科学重点项目( 5 0 2 3 10 2 0 );中国石油天然气集团公司管材研究所腐蚀与防护重点实验室开放基金和西安交通大学博士学位论文基金

摘　　要：在高温高压静态釜中对 3种油套钢N80、P110和J5 5的CO2 腐蚀进行了模拟腐蚀试验 .通过扫描电子显微镜 (SEM)对比分析了腐蚀产物膜的厚度和表面平均晶粒大小随CO2 压力的变化规律 .结果显示 ,在试验条件下 ,3种材料所得到的腐蚀产物膜的纵向形貌为双层结构 ,其膜厚随着CO2 分压变化情况比较相近 ,在CO2 分压为6 89MPa时 ,膜厚均达到最大 ,在超临界压力以上急剧减小 ;膜表面平均晶粒大小随CO2 压力的变化都出现了两个峰值和一个低谷 ,并且在超临界压力以上随着压力增加均急剧减小 ,而峰值或低谷所对应的CO2 压力和晶粒大小 ,3种材料存在明显的差异 .Simulated autoclave is employed to study the corrosion process of three kinds of oil well steels in CO 2 environment with varying CO 2 partial pressure.The effect of the CO 2 partial pressure on the average scale thickness and crystal grain size of the scales is studied by using scanning electron microscope(SEM).The results show that,the cross-section of the corrosive product scales of the three kinds of steels are doublelayers in the structures,the variation of average scale thickness for the three kinds of steels with CO 2 partial pressure is in the similar manner,of which the maximum average scale thickness appears at the CO 2 partial pressure about 6.89MPa and then decreased rapidly.The variations of the average crystal grain size with CO 2 partial pressure for the three steels exhibit two peaks and a valley in between; however the CO 2 partial pressures corresponding to the peaks and valley and crystal grain sizes for different materials vary,and crystal grain sizes of the three steels with CO 2 partial pressure decreased quickly beyond the peaks.

关 键 词：腐蚀产物膜 CO2腐蚀 CO2压力 膜厚 晶粒 SEM 

分 类 号：TG172.82[金属学及工艺—金属表面处理]