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Silver - Electrolytic polishing

Material Name: Silver
Recipe No.: 10000
Primary Chemical Element in Material: Ag
Sample Type: Bulk
Uses: Polishing
Etchant Name: None
Type (Macro/Micro): Micro
Etching Method: Electrolytic polishing
Etchant (Electrolyte) Composition: 35 g AgCN, 30-70 g KCN, 38-40 g K2CO3, 1000 ml distilled water.
Procedure (Condition): Current density: a: 1.1 A/dm2, voltage dc: 1.5 V, time: 20 min. b: 1.0 A/dm2, voltage dc: 2.5-3.0 V, temperature: 20 C, time: 10 min.
Note: Use silver for cathode and anode lead wires. Samples not preground. Find optimum conditions by trial. Slow stirring. Shuttleworth and coworkers.
Reference: Vander Voort, Metallography Principles and Practice, McGraw-Hill, Inc., 1984, p. 591.