Hardness and Structure of Electrodeposited Nickel from a Nickel Sulfamate-Formamide Bath
نویسنده
چکیده
The influence of various factors, such as current density, bath and annealing temperatures, on microhardness of electrodeposited nickel from a nickel sulfamateformamide bath was investigated. Bright, adherent, finegrained and almost defect-free nickel deposits with moderately high hardness were obtained at 50 "C and a current density of 0.6 Aldm2. The microhardness of the nickel deposits decreased with an increase in annealing temperature. The effect of annealing at various temperatures on structure of the deposits was also studied. Recrystallization of grains and grain growth in the deposits were clearly observed at high annealing temperatures. The structural and crystallographic features of the deposits were examined by SEM, TEM and X-ray diffraction studies. Hydrogen content of the deposits was also determined. The structure and hardness showed correlation with hydrogen content in the deposits.
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