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Vol. 82 (2016) No. 4 p. 367-371




This paper describes the influence of Na2SO4 electrolyzed oxidizing water (It abbreviates as EO water) on copper iron alloy for lead frame after heating processing. First, the etching characteristics of Na2SO4 EO water against the test pieces surface of the heating processing was clarified using chemicals for comparative immersion experiments. The comparative study showed that as for the etching efficiency, Na2SO4 EO water was superior and the influence to exert on the chemical composition in the test piece surface was small, compared with H2SO4 solution. Also, it puts on Na2SO4 EO water uniformly to the copper iron alloy surface after oxidation layer removal, too, by the etching. Next, by the observation using SEM image, the influence of Na2SO4 EO water on the surface shape of copper iron alloy for lead frame was clarified. The results indicated that when using Na2SO4 EO water, little occurrence of alien substance occurs and the surface becomes smooth than H2SO4 solution. Lastly, as for the test piece after heating processing, it did the surface oxidation layer removal experiment by the immersion. The results show that Na2SO4 EO water can remove the surface oxidation layer of the test pieces more efficiently compared with H2SO4 solution.

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