ALUMINIUM ALLOYS AND TO SHAPED BODIES AND METHODS OF MAKING THEM FROM SUCH ALLOYS

摘要

1484595 Aluminium alloy RIKEN LIGHT METAL INDUSTRY CO Ltd 4 Dec 1974 [29 March 1974] 52485/74 Heading C7A An aluminium alloy of composition:- (Mg 0À65-0À75%, Si 0À5-0À6%) or (Mg 0À47- 0À57, Si 0À75-0À85), balance aluminium and impurities including Fe, Cu, Mn, Zn, Cr, Ti. The alloy may be cast in billet form, homogenized for 3 hours at 550‹C, pre-heated for ten minutes at 450‹C, extruded, degreased using aqueous sodium hydroxide, rinsed in water, anodized, coated with an acrylic water soluble paint and held for 20 to 50 minutes at or below 200‹C to age harden the alloy and harden the paint film. The coated extruded shapes obtained may be used in the construction of sliding doors.