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topic 46897

CED problems: Dirt in coating; Electrophoretic coating too thin

adv.    coatec india banner

A discussion started in 2007 but continuing through 2019

Dirt in Coating

2007

Q. We are facing dirt/impurities problem on parts after CED coating.

Kalidas Suryawanshi
- Pune, India


"Electrocoating: a Guidebook for Finishers"
by Electrocoat Association
from Abe Books
or
Amazon

"Handbook of Electropainting Technology"
by W. Machu
from Abe Books
or
Amazon

2007

? Hello, cousin Kalidas. if you can give us some info, I think our readers can help! Send some pictures, and tell us what you can. If you lack sufficient data, the paint vendor, system vendor, or an e-coating consultant may be able to help. Good luck!

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


2007

A. Dirt can come due to improper cleaning in the pre treatment line. It can be due to dirt in the E-coat tank. It could be due to dirt in the rinse tanks after E-coat. It could be due to dirt being blown around in the oven with the forced circulation. It could be because of one or more than one of the reasons above. And the reasons above could also be due to improper housekeeping or ingress of dirt and dust in your E-coat shop.

Test each and eliminate. I assure you this does not require NASA technology.

Gurvin Singh
Coatec India
supporting advertiser
Mohali, Punjab, India
coatec india


January 14, 2018

A. Check for sludge material in phosphate bath ... if it is high, then desludge it immediately. This will solve your problem.

baljeet_babli_singh
Baljeet Singh
- Ludhiana, punjab, India



Ra value of CED coating

May 20, 2009

Q. PLEASE TELL ME HOW TO CHECK THE Ra VALUE OF CED COATING.
WHAT IS THE RANGE FOR OEM VEHICLES?
WHAT ARE/IS THE INSTRUMENT USED FOR CHECKING RA VALUE?

KAPIL VASHIST
ENGINEER - INDIA


June 2, 2009

A. Ra is checked by roughness gauge.
Better you ask your paint supplier for Ra Parameters.

Thanks
SURYA

SURYAPAL
- DELHI, INDIA


July 23, 2009

A. Hi,

Normally Ra value can be checked with use of Perthometer. try it.

Anand.

V.Anandaraj
- Chennai, India

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