Aluminum Etchants

• Keller's Reagent

- ASTM formula 3, the most popular general purpose micro etchant for aluminum alloys, show microstructure and grains. Contains hydrofluoric acid.

• Caustic etching solution

- ASTM formula 177, a macro etchant for visual inspection of aluminum welds. Contains NO hydrofluoric acid.

• 2% HF

- ASTM formula 11, attacks FeAl3, other constituents outlined. Contains hydrofluoric acid as the name implies.

• Others

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