Abstract
The consumption of ammonia, which had been added to a copper pyrophosphate plating bath, was investigated, and the following conclusions were drawn.
The consumption of ammonia per unit time was greater with the increase of its content in the bath. The changes in the amount of ammonia with the lapse of time in the bath were expressed by an exponential function.
Its amount of consumption depended upon temperature and pH of the bath and conditions of agitation (flow rate of air), but little upon the current. The amount was greater with higher temperature, higher value of pH, and more violent agitation.
