INFLUENCE OF SURFACE CONDITIONS, INHIBITOR ON THE CHLORIDE THRESHOLD LEVEL FOR CORROSION OF STEEL IN A SIMULATED CONCRETE PORE SOLUTION

摘要

The aim of this study is to evaluate the influence of steel surface conditions and anorganic inhibitor on the chloride threshold level for corrosion of steel in a concretecontaminated by chlorides. The corrosion of steel with two different surface conditions, i.e. amill scale and polishing treatment, has been simulated in a saturated Ca(OH)2 solutioncontaining different chloride concentration. N,N'-dimethylaminoethanol (DMEA) has beenapplied as an amino-alcohol based inhibitor. The results concluded by electrochemicalimpedance spectra (EIS) indicate that, contrasted to the steel with a mill scale, the polishingsteel has an increasing chloride threshold value. However, the addition of the inhibitorexhibits little effect on the chloride threshold level for the steel corrosion in the saturatedCa(OH)2 solution, although it is effective to reduce the corrosion rate of the steel.