在模拟油田CO2腐蚀环境下，利用XRD、EDS、XPS和SEM研 究了含Cr的N80钢腐蚀产物膜的特征.结果表明，本试验条件下Cr在腐蚀产物膜中富积，形 成非晶态物质Cr(OH)3，使得腐蚀产物膜具有阳离子选择性，阳极反应受到抑制，腐蚀速 率降低.
While simulating the CO2 corrosion environment in oilfield,the XRD，EDS,XPS and SEM techniques were adopted to study the characte ristics of CO2 corrosion scales on N80 steel containing Cr.The results demonst rated that Cr could be enriched in corrosion scales forming amorphous compound C r(OH)3,which made the corrosion scale has the character of cation-selectivity. This cation-selective scale could block anions such as Cl-,CO2-3 and H CO -3 penetrating the corrosion scale and decrease the anionic concentration at the interface between matrix and corrosion scale.As a result,the anodic reactio ns could be suppressed and corrosion rate be reduced.
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