Coating removal of glass-coated FeCoSiB microwires by chemical method

Taking glass-coated FeCoSiB microwires as the research object, the influences of the concentration of hydrofluoric acid solution (HF) and reaction temperature on the removal speed of glass coatings were investigated, and the protection effects of inhibitors on FeCoSiB cores were analyzed. The results show that with the mass fraction of HF increased from 10% to 40% at 2512, the removal speed of glass coatings is increased from 0. 005 μm·s^-1 to 0. 076 μm· s^-1. When the temperature of 40% HF is raised from 10℃ to 45℃, the removed speed of glass coatings rises from 0. 033 μm· s^-1 to 0. 234 μm· s^-1. At the temperature of 20℃ to 25℃, the optimal time for removing borosilicate glass coatings of 7.59.0 μm in thickness in 40% FIF is about 150 s. Sodium thiocyanate and sodium thiocyanate plus urotropine both inhibit remarkably HF from eroding FeCoSiB cores, and the hydrogen absorption of the cores is effectively reduced by sodium thiocyanate plus urotropine, which is advantageous to maintain the mechanical properties of the cores.