Aloha, fun & authoritative answers -- no cost, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

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

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: