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Neptunium - Electrolytic polishing

Material Name: Neptunium
Recipe No.: 9972
Primary Chemical Element in Material: Np
Sample Type: Bulk
Uses: Polishing
Etchant Name: None
Type (Macro/Micro): Micro
Etching Method: Electrolytic polishing
Etchant (Electrolyte) Composition: 8 parts H3PO4, 4 parts glycerin, 4 parts ethanol.
Procedure (Condition): Voltage dc: 10 V, temperature: room temperature, time: 3 min.
Note: Grind samples through 600-grit SiC, then 6 micron diamond on nylon. Solution not stisfactory for etching. Richter.
Reference: Vander Voort, Metallography Principles and Practice, McGraw-Hill, Inc., 1984, p. 585.