METHOD FOR PRODUCING TIN-ALUMINUM ALLOY COATED STEEL SHEET

摘要

Sn-Al alloy is plated on the surface of steel sheet by selectively simultaneous vaporation method of Sn and Al, vaporation method of Sn-Al alloy or ion-plating method of Sn-Al alloy in a vacuum chamber. In case of vaporation method of Sn-Al alloy, a temperature of the plating substrate is in a range of normal temp. to 200 deg.C, and its bias voltage is in a range of - 500 to -1000 V. The upper part of the plated layer consists mainly of Sn element with a lower content of Al element, but the lower interfacial part between the plated layer and the steel sheet consists mainly of Al element with a lower content of Sn element. The Sn-Al plated steel sheet has excellent weld ability and corrosion resistance.