Abstract
Some relations beween hardness and stress was found to exist in nickel deposits as follows:
1) Of the nickel deposit from the bath without brightener the hardness (Hv 180-370) and stress (15-65×103psi) are proportional.
2) Of the deposit from Watt's bath added with the first class brightener the stress is changed to compressive stress and its hardness is increased. In this case, the bigger the compression stress (-2- -13×103psi) is, the greater is the hardness (Hv 200-500).
3) In general, of the deposit from the bath containing both the first and second class bightener, hardness (Hv 450-700) and stress (-10-50×103psi) is increased with an increase of the secomd class brightener.
4) In all the above three cases, the bigger the stress is, the greater is the hardness.
5) Agitation of the bath generally causes the hardness and stress to increase.
6) Of the deposit from the bath added with some kind of surface active agent the stress is decreased, but the hardness increased.
