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Macro etchant for Mg and Mg alloys

Material Name: Mg and Mg alloys
Recipe No.: 10891
Primary Chemical Element in Material: Mg
Sample Type: Bulk
Uses: General macrostructure
Etchant Name: None
Type (Macro/Micro): Macro
Etching Method: Chemical
Etchant (Electrolyte) Composition: 2% ammonium pershulphate, 10% tartaric acid in water.
Note: Grain flow in forgings. Can replace the tartaric acid with citric, acetic, oxalic, and nitric acids.
Reference: Website, American Welding Institute, 2014.