Where is potassium hydrogen fluoride used
Potassium hydrogen fluoride can stably release hydrogen fluoride and has the functions of fluorine source, acidic chelating agent, and melting aid. It belongs to Class 8 corrosive hazardous chemicals and is widely used in fluorine chemical industry, metal surface treatment, glass processing, electronic manufacturing, and organic synthesis.
1、 Fluorine chemical basic raw materials (core bulk use)
1. Standard electrolyte for electrolytic preparation of fluorine gas (F ₂)
The electrolytic system composed of molten potassium hydrogen fluoride and anhydrous HF is an industrial scale route for producing elemental fluorine; Fluorine gas is further used for electronic fluorination, refrigerants, and fluorine-containing new materials.
2. Prepare anhydrous hydrogen fluoride and high-purity potassium fluoride; As a raw material for the synthesis of various metal fluorides.
2、 Metal surface treatment industry
1. Activation, matte treatment, phosphating/passivation additives for aluminum and aluminum alloys
Dissolve the dense oxide film on the surface of aluminum to enhance the adhesion of coating and anodizing pre-treatment; Prepare a matte pickling system to achieve a uniform matte surface.
2. Brazing/silver soldering flux
Silver based solder and aluminum brazing composite flux components, high-temperature removal of base metal oxide skin to prevent re oxidation and improve weld sealing.
3. Etching and cleaning of titanium, zirconium, and silicon
Etching titanium alloys and silicon materials; The titanium etching system requires the addition of oxidants to prevent metal hydrogen embrittlement.
4. Stainless steel pickling and descaling are often used in combination with nitric acid.
3、 Glass and Optical Industry
1. Glass etching agent and frosted processing
Corrosive silica, used for process glass carving, marking, and frosted glass; Compared to hydrofluoric acid, it is more convenient for powder storage and transportation, and the process is easier to control.
2. Optical glass manufacturing
Adjust the refractive index and transparency of glass; As a special optical glass melting aid.
4、 In the field of electronics and semiconductors (electronic grade high-purity products)
1. Silicon wafer cleaning and removal of impurities on the wafer surface;
2. Precursor raw materials for electronic fluoride salts and electrolyte additives;
Ordinary industrial grade cannot meet the requirements of semiconductors, and electronic grade low impurity potassium hydrogen fluoride must be used.