The corrosion behavior of BTA corrosion inhibition on Cu in NaCl solution

• 1、School of Chemical Engineering, Northwest University, Xi’an 710069, China
• 2、Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Xi’an 710069, China
• 3、Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Xi’an 710069, China

Abstract：In order to understand the corrosion inhibition mechanism on the metal surface, the adsorption and corrosion inhibition of BTA on Cu surface in NaCl solution were analysed by using the polarization curve, Electrochemical Impedance Spectroscopy (EIS), Scanning Electron Microscope (SEM) and Energy Dispersive X-ray Analysis (EDAX). The experiment result reveals the formation of the polarization curve in different applied voltage from the point of view of electron transfer. And BTA can suppress the proceeds of the anodic reaction and the cathodic reaction at the same time, therefore, it is a mixed inhibitor. Furthermore, the inhibition effect increases gradually along with the increase of the inhibitor concentration. The inhibition mechanism changed from a semi-infinite diffusion behavior into a spherical diffusion behavior when the concentration increases to a certain value. The adsorption process is a spontaneous process, which obeys the Langmuir isotherm as well. During this process, there are physical adsorption and chemisorption at the same time. In general, the inhibition mechanism is the formation of a single protective film on the copper surface to prevent the corrosion of copper.

Keywords： corrosion electrochemistry absorption inhibition mechanism single layer protective film