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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing since 1989
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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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