Hi all, did anyone have the experience on the following problem:
1) I did a anodization refurbishment (strip and re-anodize) on a AL part from a semiconductor plasmas etch equipment.
2) It look OK after refurbished. The part was in the storage for 4 weeks.
3) After 4 weeks, the surface of the part change color. It become a pad of stain and the anodize peel off from the surface.
Can anyone give advice on this ?
If wild guesses are okay, I guess the aluminum became porous during your process. Then sulfuric (or better yet, chromic) acid solution got inside the part during anodizing, leaching out under the new anodize after a time.
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