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Anodization Peeling

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 ?

Thanks,

Andy Yeo
- Singapore

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.

Tom Pullizzi
Falls Township, Pennsylvania

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