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U-Al alloys - Chemical etching

Material Name: U-Al alloys
Recipe No.: 9236
Primary Chemical Element in Material: U
Sample Type: Bulk
Uses: General microstructure
Etchant Name: None
Type (Macro/Micro): Micro
Etching Method: Chemical
Etchant (Electrolyte) Composition: 100 (50) ml distilled water, 38 (25) ml nitric acid 65% or 1 (25) ml hydrochloric acid 40% (Concentration variable).
Procedure (Condition): Seconds to minutes.
Note: U-Al alloys: UAl2 (light blue), UAl3 (yellow), UAl4 (grey).
Reference: G. Petzow, Metallographic Etching, 2nd Edition, ASM International, USA, 1999.