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Grease causing bleed in black anodized part

I am currently experiencing problems with a aluminium part which is black anodized, we have recently changed the lubricant that we apply during assembly. The issue: there is a black residue coming off with the lubricant, seems to be the anodizing. So far: we have checked whether the anodizing has been sealed and it has. Question Would the lubricant cause the anodizing to bleed.

Justin Budden
- Portsmouth, UK
2003

One possibility- your lubricant may have detergent in it. Detergents are essentially alkaline, and if this is your case, the anodic coating is not bleeding. It is being dissolved.

Dado Macapagal
- Toronto
2003

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