The results show that hydrofluoric acid and molten sodium hydroxide can be used to remove the glass coating on the microfilament surface. The removal time of the glass coating with hydrofluoric acid of 10 μm at room temperature is about 150s, sodium oxide takes about 10 s; glass composition and structure of glass-coated copper micro-wire corrosion resistance is an important factor. The glass-coated pure copper microfilament was prepared by melt-spinning method. The removal of the glass coating on the microfilament surface was studied. The corrosion behavior of microfilament in hydrofluoric acid and molten sodium hydroxide was evaluated. The corrosion resistance of glass-coated pure copper microfilament in strong acid and strong alkali was also discussed.

Special applications of hydrofluoric acid:

Glass engraving: first coated with a layer of paraffin glass, and then engraved with something sharp, and then hydrofluoric acid in the lettering of paraffin wax on it again, wait a moment writing can be revealed. Principle: Hydrofluoric acid can corrode silicon dioxide (SiO2).

Chemical equation: SiO2 + 4HF = SiF4↑ + 2H2O

Due to hydrofluoric acid has the function of solubility and oxidation, it plays an important role in the purification of aluminum and uranium. Hydrofluoric acid is also used to etch glass, engraving patterns, marking scale and text; the semiconductor industry to use it to remove the silicon surface oxide, in the refinery it can be used as isobutane and n-butene alkylation reaction catalyst, remove the surface of stainless steel containing oxygen impurities in the "pickling" process will also use hydrofluoric acid. Hydrofluoric acid is also used in the synthesis of various fluorine-containing organic compounds, such as Teflon (Teflon) and Freon refrigerants.