Abstract
The corrosion inhibitor that is added to chloride deicing salt, whose anti-corrosion and low pollution is great significance. LDHs, calcined at high temperature were used as adsorbents to remove various anionic contaminants and it could reduce the solution's freezing point after adsorbing anions. Therefore, this paper reports the use of calcined LDHs as corrosion inhibitors in deicing salts. We analyzed that the removal ability of chloride ion MgAlFeOx was stronger than that of MgAlOx, reaching 85.50%, and the freezing point was lower than that of MgAlOx, the value was -12.0 °C. At the same time, we also found that CaCl2-MgAlOx and CaCl2-MgAlFeOx significantly reduce the corrosion of carbon steel and concrete compared with chloride salts, and CaCl2-MgAlFeOx has the lowest corrosion degree. Hence, we determined that MgAlFeOx was corrosion inhibitor in chloride deicing salt. The metal molar ratio, synthesis temperature and calcination temperature for preparation of MgAl/MgAlFe-LDHs were determined by XRD and TG-DSC analysis that are 9/2/1, 120 ºC and 500 ºC, respectively. The characteristics of MgAlFeOx after Fe3+ addition were studied in detail by Zeta, XRD, XPS, BET and SEM. The mechanism of corrosion inhibitor’s anticorrosion was determined, which was achieved by adsorption and neutralization.