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MessagePosté le: Jeu 11 Jan - 10:20 (2018)    Sujet du message: angelo-ogbonna-jersey Répondre en citant

As <"">aluminium extrusion suppliers we’re familiar with anodising , AKA anodizing in the USA. So what’s it all about?

Anodising is a so-called electrolytic passivation process. It’s used to add extra thickness to the perfectly natural existing oxidised layer on the surface of the metal, and it’s called anodising because the metal being treated acts like an anode electrode, a crucial element in any electrical circuit.

Why anodise aluminium? The process improves the metal’s resistance to corrosion, enhances its resistance to wear and even makes it easier to paint primers and glues on, which also stick better as a result. You can use anodic films to create exciting cosmetic effects, either adding a thick, porous coating to absorb colourful dye or adding a light, transparent coating to better reflect and refract light. Anodising is handy for preventing galling on threaded components. It’s used to make dielectric films for electrolytic capacitors. And anodic films also help protect aluminium alloys.

Anodic films tend to be a lot stronger and stick faster than most kinds of paint and metal plating. On the downside, they’re also more brittle. As a result they’re less at risk from cracking and peeling through ageing, wear and tear, but more at risk from cracking through heat stress.

Anodising aluminium actually makes tiny microscopic changes to the surface of the metal, changing the crystal structure itself. Thick coatings are usually porous , which means it’s often wise to use a special sealing process which resists corrosion. And the effects are dramatic. Anodised aluminium is harder than regular aluminium with a low to medium resistance to wear. The resistance can even be enhanced by increasing the thickness or adding a variety of substances to seal the surface.

The commonest way of anodising aluminium is probably via sulphuric acid. It delivers a beautifully porous surface, perfect for dyeing. The base alloy dictates the final colour but in fact the choice of colours is endless. Lighter colours can be harder to achieve, especially on high-silicon casting grade aluminium and 2000 Series aluminiumcopper alloys. There are sometimes issues with the light fastness too, where organic dyes are used. Reds and blues are at the most risk of fading, with inorganic black and gold dyes amongst the most colourfast. But sealing helps reduce dye bleed and can sometimes prevent it completely.

So when was anodising first used on an industrial scale? Way back in 1923 it was brought into play to protect Duralumin seaplane parts, using a primitive chromic acid method called the Bengough-Stuart process. Later methods became more efficient and a sulphuric acid-based process was patented in 1927, which remains the most common electrolyte used for anodising aluminium.

Most recently, phosphoric acid processes have enjoyed major developments, but the technology is so new that it’s currently only used as a pre-treatment for adhesives and organic paints. But research continues into new and complex anodising science, especially for military applications. As respected <"">aluminium suppliers, UK based and always happy to help, you can trust us to give you the information you need , when you need it, supported by a team of people who know aluminium in all its forms inside out.
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MessagePosté le: Jeu 11 Jan - 10:20 (2018)    Sujet du message: Publicité

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