The inhibition efficiency of various concentrations of phenylazo-2-naphthol on thecorrosion of copper in 1N aqua regia (HCl+HNO3) was investigated by weight loss method at room temperature. The corrosion rate of copper and surface coverage of the inhibitor on the metal surface was also calculated from the weight loss data. The open circuit potential values of the system substantiate the corrosion behavior data. Langmuir adsorption isotherm concept was experimented to the adsorption behavior of inhibitor.
Copper, Inhibitor, Aqua regia, Open Ciruit Potential, Adsorption