Why is anodized aluminium sheet coil used in cell phone shells

Anodized aluminium sheet coil is used in cell phone shells because of its light weight, good hardness and excellent resistance to scratches and corrosion. Suitable alloys are 5xxx, 6xxx and 7xxx series.

The process of anodizing aims to strengthen hardness and wear resistance of aluminium sheets, during which a layer of oxide film forms on aluminum products (anode) due to the action of applied current under the corresponding electrolyte and specific process conditions. It is the most successful process at present in enlarging the application scope and extending the service life of anodized aluminium.

Aluminium sheets are ideal candidates for anodizing process, not only the process helps to enhance hardness and touch feeling of the plates, but it can color them with various colors of metal gloss. Aluminum is lively in nature, and new characteristics can be shaped by adjusting the proportion of the mixed metal, such as lighter and thinner magnesium aluminum alloy and higher strength titanium aluminum alloy. iPhone 6s and iPhone 6s plus use Apple’s customized 7 series aluminum-zinc-magnesium alloy, which mainly contains zinc. It belongs to the aerospace series. It is a heat-treatable alloy. It belongs to super hard aluminum alloy. The hardness is 60% higher than ordinary aluminum, and the density is up to One third of stainless steel, while still maintaining light weight. Apple said that the customized 7-series aluminum-zinc-magnesium alloy is processed, polished and sandblasted with tiny zirconia beads to achieve a consistent silk satin texture, while the additional anodizing process helps prevent scratches and corrosion.

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