Corrosion behavior of electrodeposited Cu-Ni alloys in presence of surfactants

Ni-Cd alloys have been electro-deposited from solution containing cationic CTAB, anionic SLS (sodium lauryl sulphate) and nonionicTX-100 (triton-X 100) to improve the surface quality of the specimens. Corrosion behavior of electrodeposited alloys in neutral solutions of boric acid (H3BO3) in 142000 ppm in presence of 2 ppm lithium hydroxide (LiOH) at 296K have been studied by, open circuit potential, linear polarization resistance, and potentiodynamic techniques. Anodic polarization curves show that the specimens exhibit quasi-passive region in all Ni-Cd samples in the potential region between about -200 mV and +200 mV (SCE) at which the current is approximately stable and dissolve trans-passivity above 200 mV (SCE). The results indicate that the samples prepared in presence of different concentrations of anionic surfactant SLS and nonionic surfactant TX-100 obviously inhibit the corrosion than those prepared in presence of different concentrations of cationic surfactant CTAB than those prepared from pure bath.