Use of ammonium bifluoride

The downstream applications of ammonium hydrogen fluoride (NH ₄ HF ₂) are concentrated in metal surface treatment, glass etching, electronics/semiconductors, new energy, petrochemicals, rare earth smelting, etc. Among them, aluminum processing accounts for the highest proportion (about 46%), followed by glass (about 17%) and semiconductors (about 6%).
1、 Metal surface treatment（
Aluminum/aluminum alloy: acid pickling to remove oxide film, generate fluoride film, improve corrosion resistance and spray adhesion (aluminum profiles, car wheels, photovoltaic frames).
Magnesium alloy: cleaning and passivation, used for lightweight components of new energy vehicles.
Stainless steel/carbon steel: acid pickling for rust removal, passivation for corrosion prevention, and suppression of hydrogen embrittlement (boilers, heat exchangers, military components).
Electroplating/electrolytic polishing: plating solution additives, adjust acidity, improve coating uniformity and adhesion (chrome plating, zinc plating, aluminum anodizing).
2、 Glass and Ceramic Industry
Glass etching/frosted: compounded with hydrofluoric acid, used for carved glass, architectural frosted glass, optical lens scale, and photovoltaic glass anti reflection layer.
Glass polishing/cleaning: Polishing optical glass and precision components to remove glass coatings/silicate residues on metal surfaces.
Ceramic/quartz processing: fluxing agents reduce sintering temperature and increase density; Acid washed quartz sand is used to remove iron and aluminum impurities, and high-purity ceramic raw materials are purified.
3、 Electronics and Semiconductors
Silicon wafer/wafer cleaning: removing surface oxide layers, polycrystalline silicon residues, and metal impurities, a key process in semiconductor chip manufacturing.
PCB circuit board: Etching copper foil, creating fine circuit patterns; Cleaning electronic components to remove soldering flux/oxides.
Optical components/fibers: precise cleaning and etching of fiber connectors, prisms, and lenses.
4、 In the field of new energy
Photovoltaic glass: Etching to prepare micro level anti reflection layer, improving light absorption efficiency by 5% -10%, used for photovoltaic module cover plates.
Lithium battery materials: Purification of lithium iron phosphate precursor, removal of metal impurities, ensuring battery energy density and cycle life.
Hydrogen energy/energy storage: surface treatment and cleaning of some electrode materials.
5、 Petroleum and Chemical Industry
Oilfield acidification: combined with hydrochloric acid to treat limestone/sandstone formations, dissolve blockages, improve oil well permeability and recovery rate.
Boiler/heat exchanger cleaning: remove silicate and sulfate scaling, restore thermal efficiency (power plants, chemical plants, refineries).
Chemical synthesis: preparation of cryolite (electrolytic aluminum flux), sodium/potassium fluoride, and fluorosilicate; Organic synthesis alkylation/isomerization catalyst components.
6、 Rare Earth and Metallurgy
Rare earth smelting: leaching and separating rare earth elements, extracting rare metals such as cobalt and beryllium from tailings, with a recovery rate of over 90%.
Preparation of beryllium/titanium metal: solvent for converting beryllium oxide into beryllium metal; Titanium alloy acid pickling and passivation.
7、 Other niche uses
Textile: Rust remover removes rust from fabrics;
Fermentation: disinfectants and preservatives;
Wood: preservatives;
Analytical chemistry: masking trivalent iron ions, quantitative analysis reagents.