ACID SALT AF is a fluoride containing acid salt designed to replace hydrofluoric acid solutions in a variety of applications. Excellent acid activator for stainless steels, nickel alloys, nickel plate, titanium and magnesium.

As an etchant and smut-removing additive for aluminum, Acid Salt AF is ideal.


  • Granular acid salt, no hazard in handling when compared to hydrofluoric acid solutions.
  • Readily soluble, miscible with all mineral acids and acid salts.
  • Versatile.
  • Activates difficult-to-plate alloys and metals, e.g., stainless steel.
  • Free-flowing, good rinsing.
  • Performs well in hard water.
  • Contains no phosphates, chelaters, chromates, or chlorides.
  1. Acid Salt AF mixtures with oxidizing acids, e.g., nitric acid.
    Tanks: polyethylene or rigid PVC.
    Ventilation: required.
    Heaters: Karbate or equivalent.
  2. Acid Salt AF mixtures with non-oxidizing acids, e.g., Sulphuric or Hydrochloric.
    Tanks: PVC or rubber-lined steel.
    Ventilation: recommended.
    Heaters: Karbate or equivalent.

Analysis of Acid Salt AF/Nitric Acid Solutions:

  1. Pipette 1 ml aliquot of the solution into a polyethylene beaker.
  2. Add 3 to 5 drops of methyl orange indicator and titrate to a yellow end-point with 0.1N sodium hydroxide. This is reading "A".
  3. Pipette another sample into a large (500-600 ml) polyethylene beaker. Add 200 mls of water and 2 drops of alizarin indicator.
  4. Add 1N sodium hydroxide until colour turns red.
  5. Add 0.5% HCl until solution just turns yellow.
  6. Add 2 mls of buffer solution (Chloracetic acid 94.48 g/litre plus sodium hydroxide 2 g/litre) then titrate with 0.1N thorium nitrate to a red end-point. This is reading "B".
Calculations: Acid Salt AF grams/litre = B x 2.85
Nitric acid % by volume (36° Bé) = [(A x 10) - B] x 0.765
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