Browsing by Author "R.Sadeghi Sarabi"

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Characteristics of electrodeposited nickel from mixed organic solvents
(Elsevier Science Inc, 1998) R.Sadeghi Sarabi; V.B. Singh
The effect of current density and bath and annealing temperature on the hardness of nickel deposited from a nickel sulfamate-ethylene glycol-diethylene glycol mixed solvent solution is studied. It is shown that the hardness of nickel deposits decreases with increasing current density but show a declining trend with elevated annealing temperature. SEM micrographs show fine-grained deposits under optimum conditions, recrystallization of grains, and grain growth at high annealing temperatures. TEM studies indicate that the deposits are free from twinning and dislocations.
Study of some physical properties and structure of nickel electrodeposits from sulphamate-mixed organic solvents
(1994) V.B. Singh; R.Sadeghi Sarabi
The nickel deposits obtained from a mixed solvent bath (25 vol.% ethylene glycol and 75 vol.% diethylene glycol) using nickel sulphamate as the electrolyte were found to be bright, adherent and smooth at a current density of 1.0 A dm-2 and 30 °C. The influence of the bath and annealing temperatures on microhardness and microstructure was investigated. The structural studies were conducted using scanning and transmission electron microscopy and X-ray diffraction. Scanning electron microscopy revealed a fine-grained structure without cracks. As-deposited nickel showed a preferred orientation at different current densities. The results have been explained by taking into account the hydrogen content in the deposits. © 1994.