Abstract:

Based on the half-cell potential and anodic polarization curves obtained via the fast steel corrosion test, the influences of different chloride salts and chlorin-containing materials on the steel corrosion are investigated, and the solidification of doped chloride ions by different materials is analyzed. The results indicate that  the influ- ence of CaCl₂ on steel corrosion is more serious than that of NaCl as steel corrosion may occur at lower total chloride and free-chloride contents when it is doped with CaCl₂;  buildups may lead to steel corrosion at a content of more than 20% ;  bottom ash does not induce steel corrosion due to its low chloride content;  the addition of cement, slag and fly ash with high effective aluminate content effectively solidifies chloride ions and reduces the steel corrosion; and  anodic polarization curves describe the steel corrosion better than half-cell potential when cement is mixed with admixtures and other compositions.

Key words: internal doping, chloride ion, steel corrosion, solidification