Abstract: The corrosion inhibition behavior of 2, 5-dimerhydryl-1,3, 4-thiazole (DMTD) on pure copper in 0.5 M sulfuric acid was studied by weight loss method, polarization curve and electrochemical impedance spectroscopy. The effect of corrosion inhibition was studied by weight loss method, and the adsorption model was discussed based on the experimental data. The electrochemical method was adopted to study the properties and mechanism of corrosion inhibitor. The weight loss results show that DMTD can significantly slow down the corrosion of pure copper in sulfuric acid solution at all four experimental temperatures, and the organic molecular adsorption meets the Langmuir isotherm. Electrochemical analysis showed that DMTD inhibited anode and cathode corrosion reaction of pure copper. With the increase of DMTD concentration, the corrosion inhibition performance of the adsorption film enhanced. The corrosion inhibition effect of DMTD was confirmed by surface morphology observation. 2, 5-dimercapto-1,3, 4-thiazole (DMTD) can effectively inhibit the corrosion of pure copper in 0.5 M sulfuric acid.

Key words: pure copper, sulfuric acid, DMTD, adsorption, corrosion inhibition