Effect of 4-phenyl4-phenylthiazole derivatives on preventing dezincification of α-brass in acid chloride solution

The influence of some 4-phenyl4-phenylthiazole derivatives on preventing dezincification of α-brass in acid chloride solution has been studied using galvanostatic polarization technique. In general at constant acid concentration, inhibiton efficiency increases with increasing concentration of inhibitors and decreases with rise in temperature. Polarization studies revealed that these compounds behave as cathodic inhibitors. The effect of temperature on corrosion of the alloy has been studied and the activation energies and some thermodynamic parameters are calculated and discussed. The adsorption of the inhibitors on α-brass surface is found to obey Timken s adsorption isotherm. Addition of I- ions to the acidic medium containing some 4-phenyl4-phenylthiazole derivatives increase the inhibition efficiency of the system