| 摘要 |
PURPOSE:To make an electrolytic current go down and improve a removal rate, by letting a copper-based electrode wire pass through the inside of oxygen low temperature plasma, forming an oxide film on its surface, and oxidizing the surface without entailing any drop in the strength. CONSTITUTION:A Cu-30% Zn alloyed wire 9 extended to 0.2mm in diameter as an electrode wire is pickled prior to treatment and washed clean and dried up. On the other hand, it is deaerated by a vacuum pump 11, feeding it with 100% oxygen by a gas cylinder 6, and a gas flow rate is set to a range of 500cc/min., taking in a microwave of 24.5GHz and output 500W from an microwave generator 1. And, when the wire 9 is passed through the inside of a reaction pipe 3, temperature of the wire 9 is 180 deg. in the measured result by an infrared radiation thermometer, and its surface color is changed to black, thus formation of an oxide film is confirmed. In consequence, the surface of the electrode wire is smooth, and its tensile strength remains unchanged prior to treatment so that a removal rate can be improved as much as 33% over.
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