In the present investigation 3-methyl-4-amino-5-mercaptotriazole (Inh I) and 3-(2- hydroxyphenyl)-4amino-5-mercaptotriazole(Inh II) have been synthesized and studied as inhibitors for the corrosion of copper in 3.5 % NaCl solution . The inhibition efficiency of the compounds have been evaluated by weight loss and electrochemical polarization methods. The surface study was done by using SEM. The inhibitors appear to inhibit corrosion process through formation of protective film which was found to consist of Cu(I)-inhibitor complex, cuprous chloride, CuCl or CuCl2 - complex ion or both on the surface.