Surface treatments, their function and suitability discussed in this paper include: chromate conversion coatings, black anodisation and gold plating. Two or three of these coatings can be applied as multicoatings on the same part at different functional areas. Chromate conversion coatings are chosen for corrosion protection and electrical continuity. Different types of chromate conversion coatings are available under different trade names for instance: Alodine 1000, Alodine 1200 or Iridite 14-2. The thickness of the coating is influenced by the concentration of chromate in the solution, by the pH as well as the immersion time. Black anodisation is employed where high emissivity and high absorption values as well as good resistance to abrasion is required. The black anodisation coating is an aluminium oxide layer with a porous structure containing a UV resistant mineral pigmentation. Black anodisation coatings show good scratch resistance compared to black paints. Gold plating is applied for high IR (Infrared) reflectivity or X-Ray absorption. The gold plating on aluminium involves several steps they include: degreasing, deoxidizing of aluminium, applying an adhesion layer, an undercoat of copper, a diffusion barrier of nickel and a final coating of gold. The coatings have been applied in different projects including ISO, CVV cone flange, XMM RGS and MIPAS, MERIS, STENTOR and METOP.
Surface treatments of aluminium for space applications
1997
6 Seiten, 8 Bilder, 4 Tabellen, 7 Quellen
Conference paper
English
Surface treatments of aluminium for space applications
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