Screening and Properties of Copper Corrosion Inhibitor in Circulating Cooling Water

Abstract

The corrosion behavior of four copper corrosion inhibitors benzotriazole (BTA), 2-mercaptobenzoxazole (MBO), methylbenzotriazole (TTA), and 5-carboxybenzotriazole (5-CBTA) at a concentration of 0.20 mmol/L to 3.5 % NaCl solution was studied. According to electrochemical test, soak test and corrosion morphology characterization analysis, the best corrosion inhibitor at the same concentration are screened out. The results of the electrochemical fitting test, static corrosion test, and metallographic micrograph all have suggested that the corrosiveness of the brass plate surface is significantly reduced after the addition of the high-concentration corrosion inhibitor. It can be obtained by means of a weight-loss method that, when the concentration of corrosion inhibitor is 0.20 × 10^-3 mol/L, the minimum corrosion rate of BTA is 1.43 × 10^-5 g/cm²·d, metallographic micrographic characterization shows that BTA's inhibition effect is the best.