Deoxidizing alone with no metal removal will normally not remove embedded cast steel shot peen residue. Some etching is usually required. However, most anodizing processes include some form of etching (metal removal) as part of the anodize process. This etching may or may not be sufficient depending on the amount of removal. A quick way to verify would be to make an aluminum shot peen sample utilizing your typical peening/forming process. Perform the etching normally required by the anodize process, complete the anodize process and subject the panel to typical anodize salt spray testing. If you have any residual iron on the surface, you will fail the salt fog test in short order. If you fail, you can go back and add additional etching prior to anodize. If you pass, then the etch associated with the anodizing was sufficient.
