STUDY OF SOME PHYSICAL-PROPERTIES AND STRUCTURE OF NICKEL ELECTRODEPOSITS FROM SULFAMATE-MIXED ORGANIC-SOLVENTS

The nickel deposits obtained from a mixed solvent bath (25 vol.% ethyl ene glycol and 75 vol.% diethylene glycol) using nickel sulphamate as the electrolyte were found to be bright, adherent and smooth at a curr ent density of 1.0 A dm-2 and 30-degrees-C. The influence of the bath and annealing temperatures on microhardness and microstructure was inv estigated. The structural studies were conducted using scanning and tr ansmission electron microscopy and X-ray diffraction. Scanning electro n microscopy revealed a fine-grained structure without cracks. As-depo sited nickel showed a preferred orientation at different current densi ties. The results have been explained by taking into account the hydro gen content in the deposits.