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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    … and a copious quantity of pixels per inch: 401 ppi for the 6 Plus and 326 ppi for the 6. Under the hood both phones have an advanced A8 processor, which is smaller and faster than the iPhone 5s A7 processor. The phones also come with an M8 processor that registers the motion of the phone. The M8 can detect both distance and elevation, making the 6 and 6…

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