Abstract
This paper describes the elucidation about the etching operation of electrolyzed oxidizing water (It abbreviates as EO water) on copper nickel alloy for lead frame. First, the etching characteristics of EO water against the surface of copper nickel alloy for lead frame was clarified using chemicals for comparative immersion experiments. The comparative study showed that as for the etching efficiency on copper iron alloy, Na_2SO_4 EO water was superior to H_2SO_4 solution, and NaCl EO water was superior to HCl solution. Next, EO water has the selective etching tendency to Cu element in copper nickel alloy for lead frame like chemicals. As for the relationship between immersion time and etching depth, Na_2SO_4 EO water is same as NaCl EO water, and become proportional connection.
