Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1999-05-24
2000-08-29
Willis, Prince
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
148251, 148265, 148275, 148692, C23C 2200
Patent
active
061102970
ABSTRACT:
The invention provides an aluminum alloy sheet that has excellent formability, high coat-baking hardenability, excellent corrosion resistance, and is particularly suitable for external automobile body plates. The aluminum alloy sheet comprises: 0.9 to 1.3 wt. % of Si, 0.4 to 0.6 wt. % of Mg, 0.05 to 0.15 wt. % of Mn, 0.01 to 0.1 wt. % of Ti, with the remainder comprising Al and inevitable impurities, while limiting Fe as an impurity to 0.2 wt. % or less and Cu as an impurity to 0.1 wt. % or less. The aluminum homogenizing an aluminum ingot with the above-described composition; cooling the homogenized ingot to a temperature of 450.degree. C. or below to begin hot-rolling; finishing hot-rolling in a temperature range from 250 to 350.degree. C.; applying intermediate annealing to the hot-rolled plate; conducting cold-rolling at a draft of 70% or more; applying a solid solution treatment followed by quenching the alloy sheet and holding it at 530.degree. C. or above for 60 sec. or less; forming a chromate film onto the quenched alloy sheet; forming a film of a lubricant containing a water-dispersible polyurethane resin and a natural wax onto the chromate film; then applying a heat treatment to the coated alloy sheet in a temperature range of from 200 to 240.degree. C. for 60 sec. or less.
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Hayashi Noboru
Itoh Hideo
Uchida Hidetoshi
Yasunaga Kunihiro
Yoshida Hiden
Honda Giken Kogyo Kabushiki Kaisha
Oltmans Andrew L.
Sumitomo Light Metal Industries Ltd.
Willis Prince
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