Norskhydro Asa

Alf Inge Romfo

Idar Kjetil Steen

Oddvin Reiso

Øystein Bauger

Geir Øyen

Snorre Rist

Tanja Pettersen

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.

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Grøa, Norway

Alf Inge Romfo