Mechanical and chemical pre -treatment
The following possibilities of surface pre-treatments (according to DIN 17611 standards) are available:Polishing
E4 brushed and grinded,
E5 grinded and polished,
E6 satinised (strongly pickled),
E7 electrochemically polished,
E8 mechanically polished + electrochemically polished,
The aluminium profiles gain a special look with the mechanical surface treatment, for instance with polishing and grinding. Smaller flaws on the surface are namely removed, a unified look is created and the surface is prepared for further treatment (decorative surface).
It is carried out automatically or manually. With the insignificant loss of material we achieve a smooth, bright surface without scratches and with high shine.
With the procedure of grinding and/or brushing we can remove bigger flaws on the surface and unify its look.
It occurs in three levels: pre-degreasing, degreasing and rinsing. The procedure removes different impurities from the aluminium surface, like oil and dirt.
Etching – satinizing and pickling
Pickling is a chemical process, which happens in alkaline solutions. By implementing etching-satinising process the surface gets tarnishing look, which varies according to type of aluminium alloy, state of surface, temperature and handling time. The stated procedures are also used as a pre-treatment of anodizing.
The aluminium gains with it a shiny surface which is however very sensitive and therefore must proceed to the further treatment of anodizing as soon as possible.
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