Inhibition Performance of Water Soluble Imidazoline Amide in Small Molecule Organic Acid

Weight-loss method, electrochemical methods and scanning electron microscopy (SEM) were used to study the inhibition performance of water soluble imidazoline amide in small molecule organic acid, the optimum amount of water soluble imidazoline amide was investigated. The results showed that when the formic acid and acetic acid concentration in the mixed solution was 250 mg/L, under the condition of 50 ℃, 15 mg/L water soluble imidazoline amide was added, the inhibition rate was the highest, up to 97.1%. Polarization curve and electrochemical impedance spectroscopy (EIS) test results coincided with those of static weight-loss method. The scanning electronic microscopy results demonstrated that a film could form on the surface of the carbon steel specimen to protect it from corrosion.