The present investigation deals with the electrodeposition of tin from chloride electrolytes. Gelatin, b-naphthol, polyethylene glycol, peptone and histidine were used as additives in the plating bath to improve the surface morphology, grain size, smoothness and corrosion resistance of the tin deposits. XRD data obtained for electrodeposited tin show polycrystalline nature with single b-phase and tetragonal structure. A uniform and pore free surface was observed under SEM analysis. AFM results indicate the grain refining brought about by the additives. Corrosion rate measurements using the Tafel extrapolation method and electrochemical impedance spectroscopy reveal the increased corrosion resistance from baths containing additives.

This paper deals with zinc plating from an acetate electrolyte and the resultant deposit properties. The addition of thiamine hydrochloride and gelatin to the plating bath improves the corrosion resistance and surface morphology of the zinc deposits. The XRD pattern obtained for electrodeposited zinc show a polycrystalline nature with a hexagonal structure. A uniform and pore free surface was observed under SEM analysis.

Acid copper plating on mild steel metallic foil is very difficult due to the galvanic displacement reaction of copper on mild steel. This can be avoided by using a suitable complexing agent. The present investigation deals with the electrodeposition of copper from non-cyanide electrolytes using glycerol as complexing agent in an alkaline medium in the presence of gelatin, anisaldehyde, imidazole and peptone as additives. These additives influence the morphology of the deposited copper films by reducing the grain size, ensuring smoothness and brightness of the films. The additives also improve the throwing power of the depositing electrolytes. The X-ray diffraction pattern obtained for the electrodeposited copper film shows a polycrystalline and face centred cubic structure. The crystal size of the copper film was calculated using Debye Scherrer's formula. A uniform and pin hole free surface morphology was observed under SEM, which revealed the grain refining brought about by the additives.

Nickel-titanium carbide nanocomposite coating was electrodeposited on mild steel substrate using Watts nickel bath, and the extent of TiC incorporation into nickel matrix was studied with respect to various TiC particle concentrations 2-15 g L 21 , bath pH 2-5 at 30-60uC and current density 2-10 Adm 22 . The volume percentage of TiC particle incorporation into the nickel matrix was found, and surface morphology, crystal size, phase of the nanocomposite, corrosion behaviour and microhardness of the Ni-TiC composite deposits were studied. It was found that the incorporation of TiC particles into the nickel matrix increased with increasing concentration of TiC particle and modified the surface morphology and orientation of the Ni-TiC deposit. A content of 10?8 vol.-%TiC particle incorporated Ni-TiC nanocomposite deposit was obtained with 8 g L 21 TiC in the nickel bath at 8 Adm 22 , pH 4, 50uC and showed better corrosion resistance and higher hardness than nickel.

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