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ASTM etchant No. 145 - Ni-Cr alloys - Electrolytic etching

Material Name: Ni-Cr alloys
Recipe No.: 11535
Primary Chemical Element in Material: Ni
Sample Type: Bulk
Uses: General microstructure
Etchant Name: ASTM etchant No. 145
Type (Macro/Micro): Micro
Etching Method: Electrolytic
Etchant (Electrolyte) Composition: 2 ml H2SO4 100 ml DI water.
Procedure (Condition): Electrolytic at 3-10 V for 5 to 15 s. Use platinum wires. H2SO4 may be increased to 20 ml for deeper attack.
Note: General structure
Reference: 1984 Annual book of ASTM Standards, Vol. 03.03, Metals Test Methods and Analytical Procedures, Metallography; Nondestructive Testing; ASTM, Philadelphia, PA ((1984), pp. 389-405.