Study of ultrafine Ni80Cr20 alloy wire corrosion-head and through-die technology in cold drawing

The ultrafine Ni80Cr20 alloy wire was prepared by cold drawing technology. To improve the through-die efficiency in ultrafine Ni80Cr20 alloy wire preparation, we explored a new ultrafine wire corrosion-head and through-die method, by which an electrochemical workstation provided precise corrosion time and a super depth of field microscope magnified apertures of diamond dies. Afterwards, we did experiments on the corrosion-head and through-die process of the 25.60 m ultrafine Ni80Cr20 alloy wire. The research process was also carried out for the 25.60 m diameter ultrafine wire cold drawn to 21.14 m. The experiment results show that the electrolysis with voltage of 5 V, 0.2 mol/L HCl solution as electrolyte, a second corrosion time and aperture of die magnified 200 times, successfully prepared the 21.14 m ultra-fine wire. This method resolves the issue of corrosion-head time inaccuracy and manual through-die difficulty, greatly improves the efficiency and success rate of through-die.