We are experiencing spotting in turned 6061-T6 bar stock. The bar stock is turned and either anodized or polished with a high cosmetic requirement. In the past, our only resolution has been to use increasingly difficult to obtain "control grain" products (Alcoa's 6061-T6511X or Kaiser's 6061-T6511C for example). We have had some relief by using a minumum amount of etching on the anodized pieces, but this proves only slightly better.
I was hoping someone could comment on:
1) the possible alternatives to these products and/or
2) the wishful possibility of using a standard off-the-shelf 6061 product and somehow treating it to acheive a clearer finish in both anodized and polished situations.
Thanks in advance for any assistance you can give.
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