CO_(2)-H_(2)S-Cl^(-)共存的地层水环境中Cr含量对钢的腐蚀产物膜特性的影响  

Influence of Cr Content on Characteristics of Corrosion Product Film Formed on Several Steels in Artifitial Stratum Waters Containing CO_(2)-H_(2)S-Cl^(-)

作　　者：王小红[1] 李子硕 唐御峰 谭浩 蒋焰罡 WANG Xiaohong;LI Zishuo;TANG Yufeng;TAN Hao;JIANG Yangang(School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学新能源与材料学院,成都610500

出　　处：《中国腐蚀与防护学报》2022年第6期1043-1050,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：四川省科技厅应用基础项目(2021YJ0346);西南石油大学重点开放实验项目(2020KSZ05011)。

摘　　要：采用带有电磁驱动轴的高温高压釜,通过失重法评价了L80、L80Cr13、22Cr、25Cr钢在含CO_(2)、H_(2)S、Cl^(-)的地层水中的腐蚀速率,采用SEM、EDS及XRD对其表面腐蚀产物膜进行了分析,利用AFM分析腐蚀后材料表面的粗糙度,使用CLSM分析腐蚀后材料表面的点蚀情况。结果表明,在CO_(2)分压为0.12 MPa、H_(2)S分压为0.003 MPa,Cl^(-)浓度为150.8 g/L,温度为80℃的地层水中,试样转速为100 r/min的条件下,4种钢材均匀腐蚀速率由大到小排序为L80Cr13>L80>22Cr>25Cr。L80Cr13钢表面的腐蚀产物膜主要是由Cr_(2)O_(3)与Cr(OH)_(3)组成,该腐蚀产物膜在Cl^(-)的作用下局部地方破损;L80Cr13钢发生了明显的点蚀,最大点蚀深度为11.037μm。L80钢表面的腐蚀产物膜主要是由FeS以及疏松的FeCO_(3)组成,该产物膜对L80钢具有一定的保护作用,但L80钢仍旧有轻微的点蚀,最大点蚀深度为1.855μm。22Cr、25Cr钢表面仅有一层钝化膜,且该钝化膜对基体具有良好的保护作用,基体几乎没有发生点蚀。The corrosion rate of L80,L80Cr13,22Cr and 25Cr in CO_(2)-H_(2)S-Cl^(-)-containing artificial stratum waters in a high temperature and high pressure autoclave equipped with electromagnetic drive shaft was evaluated by means of mass loss method.The surface morphology and element distributions of corrosion product films were analyzed by SEM,EDS and XRD.The roughness and the pitting morphology of the material surface after corrosion was characterized by means of AFM and CLSM respectively.The results suggested that the corrosion rates of L80Cr13,L80,22Cr and 25Cr decreased sequentially in the artificial stratum water with 0.12 MPa CO_(2)0.003 MPa H_(2)S,150.8 g/L Cl^(-)at 80℃for samples with rotating speed of 100 r/min.The corrosion product film on the surface of L80Cr13 was mainly composed of Cr_(2)O_(3) and Cr(OH)_(3),which was locally damaged under the action of Cl^(-),thereby,severe pitting corrosion emerged;the corrosion product film on the surface of L80 was mainly composed of FeS and FeCO_(3),which has certain protective effect for the steel,thus the steel suffered from slight pitting corrosion.There is a passivation film formed only on the surface of steels 22Cr and 25Cr,while little pitting was detected.

关 键 词：铬含量 不锈钢 CO_(2)-H_(2)S-Cl^(-) 腐蚀产物膜 

分 类 号：TG174[金属学及工艺—金属表面处理]