Ca^2＋、Mg^2＋对N80钢腐蚀速率的影响  

Influence of Ca^(2+) and Mg^(2+) on Corrosion Rate of N80

作　　者：朱世东[1,2] 白真权[2] 刘会[1] 林冠发[2] 

机构地区：[1]西安石油大学材料科学与工程学院,西安710065 [2]中国石油管材研究所石油管力学和环境行为重点试验室,西安710065

出　　处：《腐蚀与防护》2008年第12期724-726,共3页Corrosion & Protection

基　　金：中国石油天然气集团公司应用基础研究项目(06A40302)

摘　　要：利用动静态高温高压釜装置,以某油田为应用背景,采用扫描电镜(SEM)和X射线衍射(XRD)技术探讨环境介质因素Ca^(2+)、Mg^(2+)对油管钢N80腐蚀行为的影响规律,试验结果显示,N80钢在CO_2/H_2S且高矿化度的环境下的腐蚀属于极严重腐蚀,在其他条件保持相同的情况下,随着介质中的Ca^(2+)、Mg^(2+)离子浓度的增大,N80钢的平均腐蚀速率呈先降低后增大趋势;腐蚀产物膜厚不断增大,内应力增大,导致膜层脱落引发点蚀。Corrosion mechanism for NSO steel in the CO2 and H2S saturated solution with Ca^2＋ and Mg^2＋ in an autoclave was studied using the techniques of SEM and XRD. The results showed that the corrosion of N80 steel was severe in the solution with CO2/H2S and high degree of mineralization, and the corrosion rate decreased firstly and increased subsequently with the increase of Ca^2＋ and Mg^2＋. The corrosion product film peeled off and pitting corrosion occured with the increase of thickness and internal stress of corrosion product film.

关 键 词：N80钢 CO2/H2S介质 矿化 腐蚀速率 

分 类 号：TG172.2[金属学及工艺—金属表面处理]