Eco-friendly inhibitor glycine-Zn2+ system controlling corrosion of carbon steel in well water

摘要

The environmental friendly inhibitor system glycine-Zn 2+ , has been investigated by weight loss method. A synergistic effect exists between glycine and Zn 2+ system. The formulation consisting of 250 ppm of glycine and 50 ppm of Zn 2+ offers good inhibition efficiency of 82%. Polarization study reveals that this formulation functions as an anodic inhibitor. The FTIR spectra study leads to the conclusion that the Fe 2+ -Gly complex formed on anodic sites of the metal surface controlled the anodic reaction and Zn(OH) 2 formed on the cathodic sites of the metal surface controlling the cathodic reaction. The surface morphology and the roughness of the metal surface have been analyzed with atomic force microscopy. A suitable mechanism of corrosion inhibition is proposed based on the results obtained from weight loss study and surface analysis technique. The eco-friendly inhibitor glycine-Zn 2+ system may find application in cooling water system.