Yanxia Liu,Xiuquan Yao,Chunlin Liu,Xiaofang Luo,Chao Guo,Wei Du
Electrochemical and SEM methods were used to study domperidone (DPD) as an organic corrosion inhibitor for X60 carbon steel in 1 M hydrochloric acid solution. The corrosion inhibition rate decreases with increasing corrosion inhibitor concentration. The inhibition efficiency was the highest when 400 mg/L DPD inhibitor was added, showing a type of mixed inhibitor. The adsorption of DPD inhibitor on the steel surface conforms to the Langmuir isotherm as a combination of physical and chemical adsorption. In addition, the adsorption conformation of the inhibitor molecules on the steel surface was analyzed by MD calculations and the adsorption energy was calculated.
Yang Zhou,Lei Guo,Zhiheng Zhao,Sisi Zheng,Yue Xu,Bin Xiang,Savaş Kaya
The inhibition performance of domperidone on the corrosion of copper in different concentration of HCl solution has been investigated by electrochemical, weight loss, and surface analysis, and theoretical calculation methods. Results indicate that domperidone was found to be an effective inhibitor with the inhibition efficiency as high as 98.5% when the HCl concentration was 0.01 M, and the corrosion rate of copper increased with the increment of HCl concentration from 0.001 to 1 M. The potentiodynamic polarization results revealed that domperidone can be seen as a mixed type inhibitor when the HCl concentration was high (1 and 0.1 M), while it acted as a cathodic inhibitor for copper at low HCl concentrations (0.01 and 0.001 M). The potentiodynamic polarization results revealed that domperidone can be seen as mixed-type or cathodic inhibitor as the HCl concentration changes. Scanning electron microscopy studies indicated the formation of protective films of inhibitor molecule on copper surface. Besides, density functional theory-based quantum chemical calculations and molecular dynamics simulations showed the electronic structure of domperidone and its optimized adsorption configuration on copper surface, which could account for the experimental findings.