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Random adhesion failure in Electrodeposition coating

Acronyms:
(hopefully helping readers more quickly understand the Q&A's)

PT = pretreatment (cleaning & phosphatizing)
ED = electrodeposition (electro-painting, electrocoating)
CED = cathodic electrodeposition (although the workpieces may be either cathodic or anodic in electrodeposition, these days almost all electrodeposition is CED)

Q. After ED process adhesion failure occurred randomly on parts? Best probable root cause knowing all PT and ED parameters within specified range.? Kindly share your best advice to know reason and eliminate the problem. PT, ED and oven parameters are okay and adhesion failure occurred randomly. Kindly share solution.

yogesh jadhav
- Ahemadabad Gujarat India
April 12, 2022

"Electrocoating: a Guidebook for Finishers"
by Electrocoat Association

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"Electrocoats: Formulation and Technology"
by Bruggemann & Rach

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April 2022

A. Hi yogesh. No finishing process can offer proper adhesion onto a surface with dirt or oil on it. So the first place to re-examine when random adhesion failures occur is the cleaning process. But you haven't yet told us the substrate, or offered any data or pictures -- and they will surely help.

Luck & Regards,

Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

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