Norskhydro Asa

Øystein Bauger

Oddvin Reiso

Idar Kjetil Steen

Ulf Tundal

Jostein Røyset

Geir Øyen

Tanja Pettersen

Hans Bjerkaas

Tom Hauge

Snorre Kjørstad Fjeldbo

Alf Inge Romfo

Snorre Rist

Aluminium alloys suitable for etched and anodized components, in particular aluminum extrusion alloys of the types containing Magnesium and Silicon, which after being extruded to any wide variety of forms for different applications such as house buildings and other building applications is subjected to etching in a conventional alkaline etching bath and subsequent anodizing, wherein the relation between Cu and Zn is controlled to avoid preferential grain etching and the ratio of Cu/Zn is below 1.

Aluminium extrusion alloy suitable for etched and anodized components

Method and means for suppressing discoloration during thermal treatment of a product of a magnesium containing aluminium alloy, the alloy contains in wt. % Mg: 0.45-12.0, with a preferred range of 0.45-6.0 wt %. The product, being either an extrusion billet, a sheet ingot, a cast product, or a forged product is heated to a temperature T where it is prone to surface discoloration and oxidation, wherein during the thermal treatment it is exposed to a suppressing atmosphere comprising 0.5-5.0% COgas with a preference for 0.5-1.5% COgas.

Method for and equipment for suppressing discoloration of Al&#x2014;Mg products

Method for the manufacturing of an Al&#x2014;Mg&#x2014;Si(&#x2014;Cu) extrusion alloy, the alloy initially being cast to extrusion billet(s), containing in wt. %

Method for the manufacturing of Al&#x2014;Mg&#x2014;Si and Al&#x2014;Mg&#x2014;Si&#x2014;Cu extrusion alloys

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Trondheim, Norway

Øystein Bauger