Abstract
Some properties of the brightener and electrodeposit in bright nickel plating are investigated.The result obtained is as follows:1) The behavior of brightener was observed by using inhibiting action, and it was found that, except thiourea, the brightener showed greater cathodic polarization than anodic polarization, so that it was adsorbed preferentially by cathode. It is, therefore, better to select brighteners from the group of elements which are adsorbed preferentially by cathode.2) Except the deposit from Co-Ni alloy bath, the higher the hardness of bright deposit is, the more cracks appear.3) The oriention of bright deposit is (111) and (200), but that from Co-Ni alloy bath is (111) only, and their microstructure is smaller than the wave length of visible light.
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