| 摘要 |
PROBLEM TO BE SOLVED: To provide a copper-coasted aluminum wire in which generation of fine crackings due to the stress put on a copper film are prevented at the time of drawing, the aluminum wire is hardly exposed at the time of coiling, and sufficient reliability is obtained at the time of soldering and which makes an assembly lighten, thin and shorten. SOLUTION: A mat copper plating layer (3a) is firstly formed by copper electroplating on the periphery of a zinc thin film (2) formed on the surface of an aluminum wire (1) by zincate conversion. Then a thiourea derivatives, etc., are added when the periphery is electroplated with copper to form a semi gloss copper plating layer (3b). Thus the copper-coated aluminum wire (10) is obtained.
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