Abstract
The result of measuring the amount of cracks caused by tension test of the specimens of copper plate nickeldeposited 10μ thick was as follow:
1) In general, the bigger the hardness of the nickeldeposit is the smaller is its elongation. But the elongation of bright nickeldeposits in Weisberg's bath is greater for high hardness than those in other bright nickel plating baths (containing the first class and second class brighteners).
2) Relation between stress and elongation of the nickel deposit depends upon the constituents of the bath. In the case of using non bright nickel baths and Weisberg's bath, tensile stress and elongation are comparatively high. Stress in the nickel deposit from the bath contaning first class brighteners only is compressive and its elongation is smaller than that of non bright nickeldeposits. As for the stress in the nickel deposit from the both containing the first and second class brighteners, the bigger the tensile stress, the smaller is the elongation.
3) When the baths is agitated by air, the stress and hardness of the deposited nickel are increased and the elogation decreased.
4) Addition of surface activating agents has no effect upon elogation.
5) Better brightness and leveling of the nickel deposit result in the smaller elongation.
