Corrosion Inhibitors for Use in Concrete

Effects of calcium nitirite and stannous chloride on corrosion protection of steel samples submerged in oxygenated lime water containing calcium chloride were examined electrochemically and visually. Electorochemical measurements included half-cell potential, AC impedance, polarization resistance, and Tafel plot. Under the test conditions, calcium nitirite appeared to be a promising corrosion inhibitor. The nitirite-chloride ion threshold level for corrosion was between 0.07 and 0.09. Stannous chloride, however, was found to be ineffective for corrosion protection in the range of dosage considered.