| In this paper, the preparation of 2-Mercaptobenzothiazole (MBT) films on iron surface was studied. By means of static weight-loss method, Polarization curve, Electrochemical impedance spectroscopy (EIS) and quantum chemical calculation, we studied the inhibition efficiency of organic corrosion film and analyzed the formation and inhibition mechanism of the organic corrosion film. These results provide experimental and theoretical bases for selecting the conditions of preparation and the types of inhibitors. The main content of the experiments and results included:1. The preparation process of MBT film on iron surface in acidic solution was determined by using orthogonal experimental method. By means of static weight-loss method, the effect of the inhibition efficiency of organic corrosion film, such as concentration, the complex of solution, temperature and time was investigated.2. By using polarization curves and electrochemical impedance spectroscopy, the inhibition performance was studied. The effect parameters of the inhibition efficiency on Organic corrosion film, such as concentration, the complex of solution, temperature, time and acidic systems were investigated. According to the test results, equivalent circuit was given for fitting and the relevant physical and chemical parameters were calculated.3. The atomic charge of inhibitor molecule was calculated by using quantum chemical method, the possible stable conformations and the adsorption modes on iron surface was discussed, the structure and energy changes of inhibitor molecule before and after adsorption were calculated and the inhibition mechanism of the organic corrosion film was also analyzed.
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