Grainy Structure in 7075 anodized parts
Well I am new to anodizing - have had some of my CNC machined components anodized commercially here in Australia. The last batch have come back (finishes of bright black,blue and gold)with a grainy structure throughout them and the anodizing is very blotchy and uneven. The gold is especially bad. The material we use is 7075 T651. The finish was also a lot duller or matt than on previous times.
Can anyone help us with reasons this may be happening - would it be the structure of the material or the anodizing procedure? We anodize clear small parts in our own workshop very effectively but the effect is still there but not as dominant. I can provide a picture if this helps determine the cause.
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