抄録
Microscopic observation, measurement of hardness, CASS and EC tests, and measurement of corrosion potential were conducted to examine the effects of polishing, tension, bending, and welding of substrates for the specimens plated with bright nickel deposit.
The results obtained were as follows:
1) Corrosion resistance was lower with the increase in surface roughness of the substrate and the effect was greater with the decrease in thickness of plated layer.
2) The electrodeposited surface was rougher in the initial stage of deposition when the original substrate surface was rougher and the effect was greater with the increase in current density.
3) The tension of the substrate had little effects on electrodeposited layer and corrosion resistance.
4) On bending of the substrate, a few rough points were observed in the initial stage of deposition. Non-uniform distribution of hardness was revealed on account of the bending deformation in parts, by which corrosion resistance was lowered.
5) The defects in welding of the substrates had effects on corrosion pattern.
As mentioned above, the treatments of substrate in plating works had little effects on corrosion resistance. Whereas, combination of unsatisfactorily controlled factors such as defects in current density, purity of solution, and brighteners seemed to have greater effects on corrosion resistance.
