Abstract
This study was made of the effects of saccharin sodium, p-toluene sulfonamide (hereinafter referred to as “PTS”), naphthalene 1.3.6-trisulfonic acid trisodium salt (hereinafter referred to as “NTS”) as stress-reducing agents on the bath composed of ferrous sulfamate, ammonium bifluoride, and sulfamic acid.The addition of saccharin sodium to the acid sulfamate bath had a striking stress-reducing effect. A rapid decrease of stress was observed up to 0.2g/l of concentration of saccharin sodium, and the rate of decrease was less rapid up to 0.3g/l of the concentration. Finally, the stress tended to reach a constant value. The surface of the deposit from the bath containing 0.2g/l of saccharin sodium was not different from that from the bath containing no saccharin sodium; but the deposit from the bath containing 0.5g/l of saccharin sodium had a blackish gray surface.The stress was reduced with the increase in concentration of PTS. However, it was increased with the increase in concentration of NTS from 10 to 20g/l, and then was reduced with the further increase of its concentration to 40g/l.
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