Heat Treatment Chemicals Used as Catalysts or Add...

Heat Treatment Chemicals Used as Catalysts or Additives 1. Ammonium Chloride (Naushadar) Role: Flux in galvanizing and annealing Function: Removes oxide scale from metal surfaces during heat treatment Common Use: Pickling steel before hot-dip galvanizing 2. Sodium Nitrate (NaNO₃) & Potassium Nitrate (KNO₃) Role: Oxidizing salts in salt baths for nitriding and carburizing Function: Provide nitrogen/oxygen to harden steel surface layers Common Use: Salt bath nitriding to increase surface hardness 3. Sodium Carbonate (Na₂CO₃) (Soda Ash) Role: Flux and cleaning agent in heat treatment Function: Helps remove impurities and scales; used in carburizing powders 4. Boric Acid (H₃BO₃) Role: Protective coating in brazing and annealing Function: Prevents oxidation during heating by forming a glassy protective layer 5. Sodium Silicate Role: Binder in heat treatment powders/coatings Function: Holds carburizing compounds on the metal surface during heat treatment 6. Potassium Fluoride (KF) Role: Catalyst in surface treatment and brazing fluxes Function: Helps remove oxides from surfaces, improves wetting 7. Zinc Chloride (ZnCl₂) Role: Flux in annealing and galvanizing Function: Removes oxide layers and promotes clean metal surfaces 8. Sodium Thiosulfate (Na₂S₂O₃) Role: Used in quenching baths and pickling Function: Acts as an oxygen scavenger, preventing scale formation 9. Ammonium Sulfate ((NH₄)₂SO₄) Role: Used in some carburizing and nitriding powders Function: Supplies sulfur and nitrogen to modify surface properties