20碳钢在三元复合驱溶液中的腐蚀行为

CORROSION BEHAVIOUR OF MILD STEEL IN TRIAXIAL COMPOSITE FLOODING SOLUTION

采用电化学测试技术与XPS技术,研究了20碳钢在三元复合驱溶液中的电化学行为及钝化膜的组成与结构。结果表明,20碳钢在三元复合驱溶液中发生钝化,形成的钝化膜组成为:Fe_3O_4、FeOOH、Fe_2O_3和Fe(OH)_2,其厚度约为7nm,铁元素价态沿钝化膜深度变化,由表面+3价到近基体内表面+3价与+2价并存。

Mild steel (0.24wt% C) can be passivated in triaxial composite flooding solution containing 1.2% NaCl+ 0.6% petroleum sulfonate + 0.12% polyacrylamide(wt%). The composition and structure of passive film formed on the steel were investigated by XPS. The results showed that the passive film was composed of Fe3O4, FeOOH, Fe2O3 and Fe(OH)2, and its thickness was about 7nm. The valence of elemental iron varied at different depth of the passive film. At the outer surface of the passive film, the valence of iron was +3, and at the interface near the matrix, +3 and +2 iron were detected.