The Effects of Triple Bond And Pyridine Containing Organic Additives On Corrosion Behavior Of Nickel Electroplating

摘要

Nickel electroplating help to avoid corrosion and to improve the appearance. The quality of electrodeposits depends on physical and chemical conditions of bath mainly relies on the presence of organic additives that responsible for the final properties of deposits including uniformity and brightness[1-5]. In this study nickel deposits on iron were produced by adding propargyl alcohol (PA), propynol etoksilat (PME) and dietilaminopropin (DEP) chemicals in basic Watts nickel bath (A) in different concentrations. Electrodeposits in the absence and presence of organic additives were characterized by electrochemical and surface measurements. Effects of PA, PME and DEP molecules on the electrochemical corrosion behaviour of nanocrystalline Ni coatings were characterized using potentiodynamic polarization and electrochemical impedance measurements in 0.1 N H_2SO_4 solutions. Results suggested that additive play an important role on deposition rate depending on their adsorption abilities. It was observed that PME was the molecule which the best adhered one on the substrate and gives the brightest coating. However it gives the thinner coating which result slight decrease in corrosion resistance of coating as compared to deposit obtained in the absence of PA. On the other hand the corrosion resistance of coating obtained in the presence of DEP stayed almost constant when it is compared with coating in absence of additive.