Dispersing Agent for Brightener on Stannous Sulfate Bath:Studies on Bright Tin Plating (Part 2)

概要

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Effect of the dispersing agent to bright acid stannous sulfate bath containing reaction products of aldehyde and amine, cresolsulfonic acid and formaldehyde was studied by Hull cell test and cathode polarization measurment.In the case of using the sodiume n-octyl sulfate in the bath, immediate effect was negligible, but after aging brightening actions were observed.On the other hand, when polyethylen glycol nonylphenyl ether or polyethylen glycol iso-octyl ether, which have suitable HLB, were used in the bath, a clean bright deposit over most of its length of Hull cell panel at 1A was obtained without aging.The ether type nonionic surface activating agents, easily procurable from the free market, are stable in the solution that can advantageously be used immediately without aging. This might be accounted for the fact that the activating agents of this type seem to form stable micells immediately with brightener and to act as good carrier of it.Cresolsulfonic acid and formaldehyde were effective to widen bright deposit area. The highest orientation of crystals of tin was observed by X-ray diffraction in the bright deposit from these bath, compared with those from other baths. These type activating agents could not be used with wood tar, because they broke up unnecessary components of the wood tar and dispersed it in the bath.
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