Metallurgy

Non-corrodible and acid resistant chromium- and chromium-nickel steel is cleaned predominantly in pickling baths containing hydrofluoric acid. Pickling pastes often consist of ammonium- or sodium bifluoride as HF-containing components. Residues of foundry sands have to be removed from cast pieces which requires a quick and thorough treatment. Most effective here is aqueous hydrofluoric acid in various concentrations.  List of applications Aluminium - Metallurgy The inorganic fluoride, cryolite synth. powder is also a useful additive for fluxing agents, protective and grain refining salts.     Back