Na2SO4電解酸化水を用いたリードフレーム用銅鉄合金の表面酸化皮膜の除去

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This paper describes the elucidation about the removal of surface oxidation layer of copper iron alloy for lead frame after heating processing using Na2SO4-electrolyzed oxidizing water (It abbreviates as Na2SO4 EO water). First, the etching characteristics of Na2SO4 EO water against the surface of copper iron alloy for lead frame was clarified using H2SO4 solution and NaCl EO water for comparative immersion experiments. The results showed that as for the etching efficiency on copper iron alloy, Na2SO4 EO water was superior to H2SO4 solution, while inferior to NaCl EO water. Also, Na2SO4 EO water more uniformly to the composition element of copper iron alloy by the etching compared with H2SO4 solution. As for the relationship between immersing time and etching speed, Na2SO4 EO water is same as NaCl EO water. Next, as for test pieces after heating processing, it did the surface oxidation layer removal experiment by the immersion. The results show that Na2SO4 EO water doesn't pollute the test pieces surface compared with NaCl EO water and it is possible to apply to the surface oxidation layer removal process.