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US 5,312,539 AGranted
Electrolytic tin plating method
AssigneeLeaRonal, Inc.
InventorDonald Thomson
Life of this patent
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Abstract
A method for plating tin onto the surface of steel strip in an acidic electrolyte bath utilizing insoluble anodes is disclosed. Free acid in the bath is extracted from the bath and concentrated. Tin is dissolved in the concentrated extract and the extract is returned to the bath to replenish the tin in the bath.
Claims9
A method for electrolytically plating tin onto a cathodic metallic surface using an insoluble anode and an acidic electrolyte bath comprising lower alkane or alkanol sulfonic acid, comprising the steps of:
- a) immersing the metallic surface in the acidic electrolyte bath, the bath comprising a free acid and an acid combined with divalent in wherein the acid is a lower alkane or alkanol sulfonic acid;
- b) plating tin out of the bath onto the metallic surface;
- c) extracting at least a portion of the free acid from the bath to form a free acid extract;
- d) concentrating the free acid extract to form a concentrated free acid extract;
- e) dissolving tin in the concentrated free acid extract;
- and
- f) returning the concentrated free acid extract with the tin dissolved therein to the bath to replenish the bath with tin.
4 more elements
Dependencies are inferred from the claim text.