OT-TORNESCH

René Buck: So wird Aluminium eloxiert

René Buck, Aluminium verfügt über hervorragende Eigenschaften. Es ist weich und leicht, Legierungen weisen eine hohe Zugfestigkeit auf. Korrosionsbeständigkeit gehört jedoch nicht zu den Stärken. Diese lässt sich durch Eloxalverfahren erhöhen. Sie erzeugen abrieb- und verschleißfeste Oxidschichten, die Schutz vor Korrosion bieten. Ein positiver Nebeneffekt: Sie lassen Aluminium elegant und ansehnlich wirken.

Im Rahmen des Aluminium-Eloxierens werden Werkstücke an einer Gleichspannungsquelle angeschlossen, sie liegen zudem in einer elektrisch leitenden Flüssigkeit.

Schwefelsäure

Dabei handelt es sich um Schwefelsäure oder um ähnliche Formen. Die Kathoden bestehen hingegen aus korrosionsbeständigem Stahl, Blei oder aus Aluminium. Im aufgebauten Spannungsfeld wandern sauerstoffhaltige Anionen auf die Oberflächen. Dort reagieren sie mit dem Werkstoff, wobei sich Aluminiumoxid bildet.

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