Abstract
The effects of asymmetric sine-wave current plating on gold deposition have been studied using electrographic tests for porosity and accelerated environment tests. Comparison of the porosity of the deposit with that of a plate deposited under DC current indicated that an asymmetric sine-wave decreased porosity by more than 50%. A salt spray test showed that salt water resistance was improved. Frequencies of 1kHz or less were effective in decreasing porosity and improving resistance, the anodic current of the sine-wave increased the porosity and enlarged the crystal size of the deposits. The implications of these observations relating to the porosity-decreasing mechanism are discussed and compared to those of pulsed current plating.
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