Abstract
The electrochemical behavior and surface characteristics of carbon steel are investigated to clarify the influence of Cl− on its corrosion resistance in simulated slag-based geopolymer pore (SSGP) solution in this study. Adsorption layer (about 40–60 nm) forms in Cl−-containing SSGP solution, thus maintaining the passivity of the reinforcement in SSGP solution with 3.5 wt % and 7 wt % Cl−. The passive film contains FeO/FeS internal film and FeOOH/Fe2O3 external film, exhibiting slightly reduced passive film resistance in Cl−-containing SSGP solution. Further, the critical Cl− content in SSGP solution is dramatically larger than that in simulated cement pore solution, which is associated with the existence of adsorption layer and subsequently competitive adsorption of silicates.
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