H_2S/CO_2环境下两种镍基合金的腐蚀行为  

Corrosion Behavior of Ni-based Alloys in H_2S/CO_2 Environment

作　　者：赵雪会[1] 白真权[1] 尹成先[1] 林凯[1] 魏斌[1] 

机构地区：[1]中国石油天然气集团公司石油管材研究所,西安710065

出　　处：《腐蚀与防护》2010年第10期752-755,共4页Corrosion & Protection

基　　金：中石油技术开发项目(2008D-2404)

摘　　要：应用电化学极化法和溶液浸泡法对两种耐蚀合金(G3和Incoloy 825)在50℃氯化铁溶液中的点蚀敏感性进行了研究;采用高温高压釜研究了在含H2S/CO2气体介质中材料的高温腐蚀性能以及试验温度的影响。利用能谱分析仪(EDS)、扫描电镜(SEM)等分析了腐蚀后试样表面的微观形貌及组成。结果表明,Incoloy 825合金极化曲线中阳极曲线部分很平缓,无钝化区出现,极化度较低,G3阳极区有钝化区,点蚀电位相对较高;G3耐点蚀性能优于Incoloy825,其点蚀临界温度高于50℃;随着温度升高,两种材料的腐蚀程度加剧,其中Incoloy 825在高温下出现点蚀现象。The pitting corrosion behavior of two Ni-based corrosion resistant alloys,G3 and Incoloy 825,were investigated in FeCl3 solution by polarization curves and immersion testing.The high temperature corrosion behavior of the alloys in NaCl solution containing H2S/CO2 was studied using high temperature high pressure autoclave.The scanning electron microscopy（SEM） and energy disperse spectroscopy（EDS） were used to analyze the microstructure and composition of the samples.The results showed that the pitting-resistance of G3 was superior to that of Incoloy 825,and the critical pitting temperature of G3 was higher than 50 ℃.The corrosion behaviors of the two alloys were different,i.e.,G3 had anodic passivation area and higher pitting potential.With the increase of experimental temperature the corrosion degree of the two alloys increased and some pits appeared on the surface of Incoloy 825.

关 键 词：镍基合金 腐蚀 高温高压 点蚀电位 

分 类 号：TG172.3[金属学及工艺—金属表面处理]