原油对碳钢腐蚀行为影响的研究  

Effect of Crude Oils on Corrosion Behavior of N80 Steel

作　　者：姬鄂豫[1] 李爱魁[1] 张银华[1] 郭兴蓬[1] 顾小曼[1] 赵丽华[1] 

机构地区：[1]华中科技大学化学系

出　　处：《材料保护》2004年第5期42-44,67,共3页Materials Protection

摘　　要：为了研究原油对石油体系腐蚀行为的影响 ,正确评价和预测其腐蚀行为。通过失重法和电化学方法 ,评价了 7种不同产地的原油在 1%NaCl的饱和CO2 体系中对碳钢腐蚀速率的影响 ,探讨了原油对碳钢腐蚀行为的影响机理。通过GC -MS联用 ,分析了试片表面吸附物质的主要成分和组分 ,探讨了原油的组分与碳钢腐蚀行为的相关性。试验表明 ,原油对碳钢的CO2 腐蚀行为有显著的影响 ,缓蚀作用的机理主要是几何覆盖效应。原油中具有缓蚀作用的化合物吸附在金属表面 ,有利于生成更致密的腐蚀产物膜 ,在抑制表面腐蚀反应的活性点的同时阻碍了腐蚀性物质与腐蚀产物的传输 ,从而显著降低了碳钢的腐蚀速率。Effects of seven crude oils on corrosion behaviors of carbon steel in CO_2 saturated 1 % NaCl solution were investigated by weight loss and electrochemical methods. The absorptive on N80 steel sample was analyzed to demonstrate the correlation between components of crude oils and corrosion of N80 steel by GC MS analysis. Results indicate that there has obviously effect of crude oil on CO_2 corrosion of N80 steel, inhibitions of crude oils are different, and the inhibition mechanism belongs geometric blocking effect. Chemicals in crude oil with inhibition effect is absorbed on the surface of metal and make it easy to occur compact corrosion product film, which simultaneously prevents the corrosion of active sites and transfers of corrosive medium and corrosion product, so as to decrease the corrosion of carbon steel.

关 键 词：CO2腐蚀 原油组分 失重法 极化曲线 GC—MS分析 

分 类 号：TG172.8[金属学及工艺—金属表面处理]