Title:
VACUUM CHAMBER ELEMENTS MADE OF ALUMINIUM ALLOY
Document Type and Number:
WIPO Patent Application WO/2014/060660
Kind Code:
A8
Abstract:
The invention relates to a vacuum chamber element obtained by machining and surface-treating a sheet, with a thickness at least equal to 10 mm, of aluminium alloy having the composition, as % 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 aluminium. The invention also relates to a process for manufacturing a vacuum chamber element, in which, successively, a sheet of aluminium alloy of the 5XXX series or of the 6XXX series, the thickness of which is at least 10 mm, is supplied, said sheet of vacuum chamber element is machined and said element is degreased and/or stripped, anodizing is carried out at a temperature of between 10 and 30°C with a solution comprising 100 to 300 g/l of sulphuric acid, 10 to 30 g/l of oxalic acid and 5 to 30 g/l of at least one polyol, and the product thus anodized is optionally hydrated in deionized water at a temperature of at least 98°C, preferably for a period of at least approximately 1 h. The products according to the invention in particular have an improved property homogeneity and also an advantageous corrosion resistance.
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Inventors:
VAN KAPPEL JOOST MICHEL (CH)
GASQUERES CEDRIC (FR)
PIPPIG SCHMID KRISTIN (CH)
DAVO GUTIERREZ MARIA BELEN (FR)
GASQUERES CEDRIC (FR)
PIPPIG SCHMID KRISTIN (CH)
DAVO GUTIERREZ MARIA BELEN (FR)
Application Number:
PCT/FR2013/000271
Publication Date:
May 14, 2015
Filing Date:
October 15, 2013
Export Citation:
Assignee:
CONSTELLIUM FRANCE (FR)
CONSTELLIUM VALAIS SA AG LTD (CH)
CONSTELLIUM VALAIS SA AG LTD (CH)
International Classes:
C22C21/02; B01J3/00; C22C21/08; C22F1/05; C25D11/04; C25D11/08; C25D11/10; H01J37/32
Attorney, Agent or Firm:
BUTRUILLE Jean-Rémi (725 Rue Aristide Bergè, CS10027 Voreppe, FR)
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