Aluminum Etchants

2% HF (Alpha Case)

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

AWS D1.2 Basic Etchant

• Listed in AWS welding code, two times faster than the Caustic etching solution. Contains no hydrofluoric acid.


Caustic Etching Solution

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


Keller's Reagent

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

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