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.
出处
《腐蚀与防护》
CAS
北大核心
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)
