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Nb and alloys - Chemical etching

Material Name: Nb and alloys
Recipe No.: 10842
Primary Chemical Element in Material: Nb
Sample Type: Bulk
Uses: General microstructure
Etchant Name: None
Type (Macro/Micro): Micro
Etching Method: Chemical
Etchant (Electrolyte) Composition: 30 ml H2SO4, 30 ml HF, 3-5 drops H2O2 (30%), 30 ml distilled water.
Procedure (Condition): Immerse sample 5-60 s.
Note: No data
Reference: Vander Voort, Metallography Principles and Practice, McGraw-Hill, Inc., 1984, p. 669.