Corrosion Inhibition Mechanism and Performance of Immobilized Lysozyme

Lysozyme was immobilized on MCM-41 mesoporous molecular sieve by physical adsorption method, and then compounded with chemical inhibitors amino trimethylene phosphonic acid (ATMP) and sodium of polyaspartic acid (PASP) to act as the circulating cooling water inhibitor. Electrochemical methods were used to analyze the inhibition mechanism of the compound inhibitor, and the method of weight loss of was used to analyze the inhibition performance of the compound inhibitor which would be the index of the optimized compound condition. The results showed that the compound inhibitor was a mixed inhibitor, which could inhibit the cathodic reaction and the anodic reaction in the corrosion process at the same time. The optimal compound scheme was as follows, when the adding amount of immobilize lysozyme was 0.7 g/L, ATMP was 10 mg/L and PASP was 20 mg/L, the inhibition rate could be up to 88.55%, the corrosion rate of carbon steel in circulating cooling water would decrease to 0.0173 mm/a, and the action time could be up to 11-13 days.