Abstract
The anodic behavior of zinc, cadmium, and Cd‐Zn binary alloys has been studied in 1M sulfamic acid‐formamide solution. The anodic polarization curves for the single metals and alloys containing 90, 81.9, and 40% Cd are typical of electropolishing systems. In all cases a‐c impedance measurements indicate the formation of solid anodic films at the onset of polishing. Under steady‐state conditions of dissolution (300 coulombs) of the alloys the ratios of metal dissolved anodically are similar to those in the original alloys. All current efficiencies were 100 ± 2.5%. All of the alloys are deeply etched under appropriate conditions and considerable phase contrast is found during polishing conditions. Here there is a small amount of preferential dissolution of Cd‐rich phases which give rise to phase contrast while film formation suppresses crystallographic etching. The effects of anode shape and method of polarization on polarization data in sulfamic acid‐formamide solutions are also discussed.
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