| 摘要 |
PROBLEM TO BE SOLVED: To obtain an Al alloy excellent in creep resistance at the time of energizing and free from the reduction of electric conductivity by subjecting an Al alloy contg. specified ratios of Si, Mg, Fe, Cu, and the balance Al with inevitable impurities to refining treatment. SOLUTION: An Al alloy contg., by weight, 0.3 to 0.8% Si, 0.35 to 1.0% Mg, 0.1 to 0.6% Fe, 0.12 to 0.5% Cu, and the balance Al with inevitable impurities is subjected to T6, T8 or T5 treatment to obtain an automotive electric conductor made of an Al alloy. Preferably, one or more kinds of 0.1 to 0.3% Mn and 0.1 to 0.3% Zr are added thereto to improve its creep resistance as well. In the case by rolling working, the Al alloy ingot is subjected to T8 treatment or T6 treatment. In the case of extrusion working, the Al alloy ingot is subjected to T8 treatment, T6 treatment or T5 treatment. On the surface of the obtd. Al alloy material, an Ni plating film of 3 to 10μm thickness is formed, and, an Sn plating film of 2 to 10μm thickness is formed thereon. Its corrosion resistance and electric characteristics are improved.
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