ABSTRACT The effect of thiosulphate/H2S on crevice corrosion behaviour of P110 carbon steel in the CO2-saturated 3.5 wt% NaCl solution was investigated. The results showed that crevice corrosion of P110 steel could not occur in the CO2-saturated solution, likely due to the inhibition of both anodic and cathodic reactions inside crevice. Further, the structure of corrosion product film along the crevice wall is influenced by the concentration of thiosulphate. Increasing the concentration of thiosulphate to 10−2 mol L−1 promotes the formation of fine flake-like mackinawite outside crevice. In addition, crevice corrosion of P110 steel in the CO2-saturated solution is promoted by increasing the concentration of thiosulphate. This is because the dense and fine mackinawite film on the steel surface has a better protectiveness and could enhance cathodic reaction rate outside crevice.

中文翻译：

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硫代硫酸盐/H2S对P110碳钢在CO2饱和溶液中缝隙腐蚀行为的影响

摘要 研究了硫代硫酸盐/H2S 对 P110 碳钢在 CO2 饱和的 3.5 wt% NaCl 溶液中缝隙腐蚀行为的影响。结果表明，P110 钢在 CO2 饱和溶液中不会发生缝隙腐蚀，这可能是由于缝隙内的阳极和阴极反应受到抑制。此外，沿缝隙壁腐蚀产物膜的结构受硫代硫酸盐浓度的影响。将硫代硫酸盐的浓度增加到 10-2 mol L-1 会促进缝隙外细小片状菱镁矿的形成。此外，增加硫代硫酸盐的浓度会促进 P110 钢在 CO2 饱和溶液中的缝隙腐蚀。