Die-cast aluminium can not make the texture of the iPhone 6 by anodizing.
The process of making Ip6 aluminium alloy fuselage is briefly described as follows:
Aluminum extrusion – CNC blank – T treatment – Nano injection molding – grinding – sandblasting – anodic oxidation – CNC bright edge. The main reason why die-casting aluminium blank is cheap is that the processing time of CNC blank after aluminium extrusion is saved.
But there is a big defect in die-casting aluminium: it is easy to produce pore and impurity. In CNC process, the defect becomes obvious when it meets the position of air hole, and there will be “small pits” on the surface, commonly known as sand holes; after anodic oxidation, because of the influence of impurity silicon, the surface will produce black spots and black lines; because the density of die-casting aluminum is not as high as that of aluminium extrusion, after anodic oxidation, the surface grain pattern will be more obvious.
So the surface effect of die-casting aluminium produced by conventional process is very poor.
Can you do it? It can also be done.
Mould exhaust holes should be improved to minimize the amount of internal bubbles; polishing and polishing before sand blasting has little effect, but there are some effects; spraying coarse sand, such as glass sand, to cover the sand holes; selecting aluminium material without silicon to avoid black spots; deep anodic oxidation color, such as black, covering defects; making small appearance parts. In order to improve the yield.
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