Anodized Aluminum

Anodizing (also spelled anodising, particularly in the UK and Australia) is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts.The process is called anodizing because the part to be treated forms the anode electrode of an electrical circuit. Anodizing increases corrosion resistance and wear resistance, and provides better adhesion for paint primers and glues than does bare metal. Anodic films can also be used for a number of cosmetic effects, either with thick porous coatings that can absorb dyes or with thin transparent coatings that add interference effects to reflected light.
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    … Plus more effective as activity trackers. The phones will be faster too, with advanced Wi-Fi and LTE antennas. They will be able to transmit calls over Wi-Fi and seamlessly transfer between Wi-Fi and your cellular signal without calls being dropped, according to Apple. T-Mobile will be the first carrier in the US to offer this feature, beginning…

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