Specifications

Basic information

Hydrofluoric acid (Hydrofluoric Acid) is an aqueous solution of hydrogen fluoride gas, a clear, colorless, corrosive liquid with a strong pungent odor. Hydrofluoric acid is a weak acid that is extremely corrosive and strongly corrodes metals, glass and silicon-containing objects. Inhalation of vapors or contact with skin can cause incurable burns. The laboratory generally uses fluorite (the main component is calcium fluoride) and concentrated sulfuric acid to make, need to be sealed in a plastic bottle, and kept in a cool place.

Application areas

Due to the ability of hydrofluoric acid to dissolve oxides, it plays an important role in the purification of aluminum and uranium. Hydrofluoric acid is also used to etch glass, can be engraved patterns, marking scales and text; the semiconductor industry uses it to remove oxides on the surface of silicon, it can be used as a catalyst for the alkylation of isobutane and n-butene in refineries, and hydrofluoric acid is also used in the "pickling" process to remove oxygen-containing impurities on the surface of stainless steel. Hydrofluoric acid is also used in the synthesis of a variety of fluorine-containing organic compounds, such as Teflon (polytetrafluoroethylene) and Freon-like refrigerants.

Both hydrofluoric acid and molten sodium hydroxide can be used to remove the glass coating on the surface of microwires. At room temperature, the time for hydrofluoric acid to remove the glass coating with a thickness of 10 μm is about 150s, and the time for molten sodium hydroxide is about 10 s. The composition and structure of glass are important factors affecting the corrosion resistance of glass-coated pure copper microwires. The glass-coated pure copper microwires were prepared by melt spinning method, the removal of the glass coating on the surface of the microwires was experimentally studied, the corrosion behavior of the microwires in hydrofluoric acid and molten sodium hydroxide was evaluated, the corrosion resistance of the glass-coated pure copper microwires in strong acid and alkali was analyzed, and the corrosion mechanism was discussed.

Packaging, transportation and safety

Operation precautions: airtight operation, pay attention to ventilation. The operation is as mechanized and automated as possible. Operators must be specially trained and strictly abide by the operating procedures. It is recommended that the operator wear self-priming filter respirator (full face mask), rubber acid and alkali resistant clothing and rubber acid and alkali resistant gloves. Prevent vapor leakage into the workplace air. Avoid contact with alkalis, active metal powder, glass products. Handle and unload lightly to prevent damage to packaging and containers. Equipped with leakage emergency treatment equipment. Empty containers may leave harmful substances.
 
Precautions for storage: Store in a cool and ventilated warehouse. Keep away from fire and heat source. The temperature of the warehouse shall not exceed 30 ℃ and the relative humidity shall not exceed 85%. Keep container sealed. Should be stored separately with alkali, active metal powder, glass products, do not mix storage. The storage area should be equipped with leakage emergency treatment equipment and suitable containment materials. Monitoring method: Ion selective electrode method; Fluorine reagent-lanthanum salt colorimetric method