Electrochemical Study on Blast Furnace Slag Mixed Cement-based Anticorrosive Paint

Abstract

In this study, the influence of chemical factors of anticorrosion paint blended with blast furnace slag mixed cement on rust prevention effect was evaluated electrochemically. The blast furnace slag mixed cement provides an alkali atmosphere in the rust preventive layer and protects steel from invasion of corrosive agents. The rust preventive effect is emphasized when used in combination with nitrite. As a condition for nitrite to exhibit rust prevention effect, strong alkali and nitrite / chloride concentration ratio of ［NO₂^－］/［Cl^－］≧1 are necessary. Sulfate ions required smaller amount of nitrite ions than chloride ions.