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Bismuth - Electrolytic polishing

Material Name: Bismuth
Recipe No.: 9893
Primary Chemical Element in Material: Bi
Sample Type: Bulk
Uses: Polishing
Etchant Name: None
Type (Macro/Micro): Micro
Etching Method: Electrolytic polishing
Etchant (Electrolyte) Composition: 200 ml methanol, 50 ml H2SO4, 50 ml HCl, 20 ml ehylene glycol.
Procedure (Condition): Voltage dc: 6-10 V, time: 2-4 min or more.
Note: Use platinum for cathode and anode lead wires. Polish samples mechanically to a fine abrasive. Electropolish with agitated solution. If a frostu film appears, add HCl a few drops at a time to the solution. Never touch the surface with cotton. Coons.
Reference: Vander Voort, Metallography Principles and Practice, McGraw-Hill, Inc., 1984, p. 566.