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Due to its ability to dissolve oxides, hydrofluoric acid plays an important role in the purification of aluminium and uranium. Hydrofluoric acid is also used for etching glass, which can be engraved with patterns, scales and characters; it is used by the semiconductor industry to remove oxides on the surface of silicon, and 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 process of ‘acid dipping’ for the removal of 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, a refrigerant.
Both hydrofluoric acid and molten sodium hydroxide can be used for the removal of the glass coating layer on the surface of the 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 the glass-coated 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 behaviour of the microfilaments in hydrofluoric acid and molten sodium hydroxide, and to analyse the corrosion resistance of the glass-coated pure copper microfilaments in strong acids and alkalis, and to discuss the corrosion mechanism.
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