Uses of hydrofluoric acid
2023-08-21
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Because of its ability to dissolve oxides, hydrofluoric acid plays an important role in the purification of aluminum and uranium. Hydrofluoric acid is also used to etch glass, which can be engraved with patterns, scales and text; it is used by the semiconductor industry to remove oxides from the surface of silicon, and in refineries as a catalyst for the alkylation of isobutane and n-butene, as well as in the “leaching” process of removing oxygen-containing impurities from 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, a type of refrigerant.
Both hydrofluoric acid and molten sodium hydroxide can be used for the removal of the glass coating layer on the surface of microfilaments, and the time for the removal of the glass coating layer with a thickness of 10 μm is about 150 s for hydrofluoric acid and about 10 s for molten sodium hydroxide at room temperature; the composition and structure of the glass is an important factor influencing the corrosion resistance of glass-coated pure copper microfilaments. The glass-coated pure copper microfilaments were prepared by the melt spinning method, and the removal of the glass coating layer on the surface of the microfilaments was experimentally investigated to evaluate the corrosion behavior of the microfilaments in hydrofluoric acid and molten sodium hydroxide, and to analyze the corrosion resistance of the glass-coated pure copper microfilaments in strong acid and alkali, and discuss the corrosion mechanism.
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Chuangzhi Valley, Guoli Town, Huantai County, Zibo City, Shandong Province