The process is easily controlled by CVS analysis and Hull cell
tests, and can be applied to both panel and pattern plate.
In this work, a Hull cell was used with a 250 ml capacity.
To study the influence of the secondary current distribution at different levels of electrolyte stirring on Vickers micro-hardness, Hull cell was used.
It is possible to co-deposit nickel and tungsten metals with the diamond particles included using the Hull cell with magnetic stirring.
The presence of metallic and organic impurities can be detected with a ten minute Hull Cell plating check.
The Hull Cell is in effect a small plating bath of specific dimensions.
Some Hull Cells contain all of the electrolyte, the standard one holding 267ml, others have holes in the bottom of the cell so that it may be immersed in a larger quantity of electrolyte; many have a facility for air agitation along the cathode face.
The above figure is similar to the Hull Cell
Testing concept, whereby the cathode is set at an angle from the anode to simulate varying current densities.
Hull cell tests using a current of 5 A indicated that both the original faulty solution and the replacement were failing to give coverage at low current density.
Of course the guess at the source of the problem was correct, and most times a "quick fix" would hove been achieved, If this decision had been coupled with some simultaneous laboratory testing it would have been justified; the basic Hull Cell testing that would have revealed the faulty acid would only have taken 40 minutes.
In essence the Hull Cell is a miniature plating bath which can reproduce on a flat plate, 4in X 3in, a picture of the plated deposit you will obtain over a very wide range of current density.
Quite frequently it is possible to save a lot in brightener additions by first getting the optimum base constituent levels, and this is most easily achieved by using the Hull Cell.