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Al-Cu alloy - Electrolytic thinning

Material Name: Al-Cu alloys
Recipe No.: 3335
Primary Chemical Element in Material: Al
Sample Type: Thin foil
Uses: Electrolytic thinning
Etchant Name: None
Type (Macro/Micro): Micro
Etching Method: Electrolytic thinning
Etchant (Electrolyte) Composition: 33% nitric acid, 67% methanol.
Procedure (Condition): Electrolytic thinning by window technique, PD: 5-9 V, CD: 0.05 A/cm2, temperature: - 30 C.
Note: Cool electrolyte to give correct CD withdraw specimen through layer of liquid N2. Wash in cold MeOH.
Reference: P.R.Swann, et al., J.Inst.Met., Vol.90, 1961, p. 133.