Abstract
The degree of uniformity of plating and throwing power by barrel plating was varied with the composition on bath and operating conditions. The effects of the above variables on the uniformity and throwing power were experimentally investigated under various conditions and the following results were obtained.
(i) The throwing power of nickel bath containing brightners was inferior to that of no brightners.
(ii) Throwing power, uniformity of plating, and conductivity were increased with the increase of the diameters of holes on the side plate of the barrel, while the rotation velocity of the barrel should be as high as possible, but it was not permitted to be too high.
(iii) In general, throwing power and the degree of uniformity were decreased with the increase of current density and loading amount.
(iv) When the addition of nickel chloride was replaced by sodium chloride in Watt's bath, conductivity and throwing power were improved. In this case, the throwing power with the addition of brighteners was higher than that of the original Watt's bath.
