Corrosion Inhibition of Some Volatile Corrosion Inhibitors for Cast Iron

Screening efficient volatile corrosion inhibitors is an effective way to protect cast iron relics. Weight-loss methods was introduced to evaluate the most effective volatile corrosion inhibitor from methenamine, sodium benzoate, BTA and CHC. Electrochemical methods were used to study the electrochemical behavior of cast iron in NaCl solution with different volatile corrosion inhibitors. The results show that, as a mixed inhibitor, CHC had good volatility and short induction period. It had perfect corrosion inhibition, so it could be used as volatile corrosion inhibitor for cast iron.