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Abstract

The invention relates to a vacuum chamber element obtained by machining and surface treatment of a plate of thickness at least equal to 10 mm of aluminum alloy, composed as follows (as a percentage by weight), Si: 0.4-0.7; Mg: 0.4-0.7; Ti 0.01-<0.15, Fe<0.25; Cu<0.04; Mn<0.4; Cr 0.01-<0.1; Zn<0.04; other elements <0.05 each and <0.15 in total, the rest aluminum. The invention also relates to a manufacturing method for a vacuum chamber element wherein successively a plate with a thickness of at least 10 mm of aluminum alloy of series 5XXX or series 6XXX is provided, said plate is machined to a vacuum chamber element, said element is degreased and/or pickled, it is anodized at a temperature of between 10 and 30° C. with a solution comprising 100 to 300 g/l of sulfuric acid and 10 to 30 g/l of oxalic acid and 5 to 30 g/l of at least one polyol, optionally the anodized product is hydrated in deionized water at a temperature of at least 98° C. preferably for a period of at least about 1 h. Products according to the invention have an improved property homogeneity and an advantageous resistance to corrosion.

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First Claim