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Niobium, Tantalum - Attack polishing

Material Name: Niobium, Tantalum
Recipe No.: 9740
Primary Chemical Element in Material: Nb, Ta
Sample Type: Bulk
Uses: Polishing
Etchant Name: None
Type (Macro/Micro): Micro
Etching Method: Attack polishing
Etchant (Electrolyte) Composition: 450 ml distilled water, 10 ml H2SO4, 5 ml HNO3, 15 ml HF.
Procedure (Condition): Use stainless steel wheel. Add etch, then alumina to cloth. As polishing progress, flush with water and finish with alumina only.
Note: Anderson
Reference: Vander Voort, Metallography Principles and Practice, McGraw-Hill, Inc., 1984, p. 546.