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Ted Mooney, P.E. RET
Pine Beach, NJ

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Metallography acids

What are the % grades of the following acids (HF, HCI and HNO3) used in etching steels and aluminums?

Mison Chang
Self - Montgomery, Alabama
2005

If I understand your question correctly, you want to know the concentration of these acids prior to mixing them into various etchants. You should be using laboratory grade reagents, which means the concentration of HF is nominally 48% by mass, HCl is 37%, and HNO3 is 70%.

Toby Padfield
Automotive module supplier - Michigan
2005

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