plating, anodizing, & finishing Q&As since 1989
Grain refining etch on aluminum
I need an effective method of etching 6061 aluminum to produce a dull matte finish without exposing the pronounced large grain structure. I currently use a caustic etch. I have tried lowering the bath temperature and one proprietary grain refining additive without the desired results. I will subsequently black anodize the part.
- Dayton, Ohio
You can vary the caustic, carbonate, and simple and complex phosphates to vary the etch.
Then you can try acid etchants containing fluorides will produce a satin etch on some alloys.
Perhaps even a chemical polishing solution may change the look of the surface. One based on phosphoric acid, nitric, acetic, etc.
Falls Township, Pennsylvania
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