Abstract
The three different methods weight loss, volume of hydrogen evolution and polarization measurements confirm that P-chlorobenzylidencyanothioacetamide can inhibit the corrosion of zinc in 1N HCl. All the results of the three methods are in good agreement that the inhibitor efficiency increases with increase of inhibitor concentration. The degree of surface coverage varies linearly with logarithm of inhibitor concentration fitting a Temkin isotherm. The inhibitor molecules are physically adsorbed on the zinc surface as indicated from the decrease in title inhibitor efficiency with the rise of temperature.