Electrolytic Determination of Tin and Tin-Iron Alloy Coating Weights on Tin Plate

Abstract

Tin can be anodically removed from steel in a lN hydrochloric acid solution with full current efficiency. In contrast with electrolytic behavior in alkaline media, the action does not stop at the tin‐iron alloy surface but this intermetallic compound is stripped as well. The voltage changes, which develop between a reference electrode and the tin plate specimen (anode), are transmitted to a recording potentiometer which plots a time‐potential curve with two end points from which the free and alloyed tin are determined. Apparatus with a specially designed d‐c power source is described.