Roughly the rolling copper or the copper alloy foil and the rolling copper or it is rough the conversion method of the copper alloy foil of having the conversion processing aspect

摘要

In rolling copper or copper alloy foil, blue vitriol (Cu conversion: 1 - 50g/L), sulfuric acid: 1 - 150g/L, as an additive, the kind which is selected from the octyl sodium sulfate, the decyl sodium sulfate and the sodium dodecyl sulfate or making use of the plating bath which adds two kinds or more, temperature: 20 - 50C, current density: Roughly the rolling copper or the copper alloy foil which has the conversion which consists of the copper very fine particle which features that roughly it converts plates under the conditions 10 - 100A/dm2 processing aspect. It is rough, roughly it is something which offers the conversion which makes the crater decrease which is the rolling copper or copper alloy foil peculiar considerable fault which has the conversion processing aspect processing rolling copper or the copper alloy foil, in addition strength is high, there is a bond strength of resin layer, possesses resistance to acid and resistance tin plated liquid characteristic, furthermore peel strength is high, satisfactory etching characteristic and has, glossiness ideal, the rolling copper or the copper alloy foil and that offers conversion processing method to the flexible printed circuit board whose fine patterning of wiring is possible roughly.