CED problems: Dirt in coating; Electrophoretic coating too thin
A discussion started in 2007 but continuing through 2018
Dirt in Coating(2007)
Q. We are facing dirt/impurities problem on parts after CED coating.Kalidas Suryawanshi
- Pune, India
? Hello, cousin Kalidas. If you lack any data, your best answer might be to retain an e-coating consultant. But if you can give us some info, I think our readers can help! Good luck!
Ted Mooney, P.E.
Pine Beach, New Jersey
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.
Mohali, Punjab, 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.
- Ludhiana, punjab, India
Relation between thickness of CED coating and anolyte conductivity?(2007)
Q. Thickness problem: Is there any relation between thickness of CED coating & an anolyte conductivityAvinash Vidhate
Director - Nashik, Maharashtra, India
A. There is no relationship between CED film thickness and anolyte conductivity as long as your CED bath conductivity and anolyte conductivity is with in the spec.
Anions(CH3COO-) are generated during CED process and it is moving to Anolyte system through semi permeable membrane at the anodes there by the conductivity of anolyte increases and replenished with DI (maintained with in the spec between 400 - 400 microsiemens). If anolyte system not removing the Anions then it will be remain in CED bath then the conductivity of bath slowly increases make difference in film formation.
Please check paint supplier for Bath conductivity and Anolyte conductivity spec.
paint shop manager
Chennai, Tamilnadu, India
Ra value of CED coatingMay 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?
ENGINEER - INDIA
June 2, 2009
A. RA is checked by roughness gauge.
better you ask to your paint supplier for RA Parameters.
- DELHI, INDIA
July 23, 2009
Normally Ra value can be checked with use of Perthometer. try it.
- Chennai, India
How to increase Electrophoretic DFT (linseed oil base)
Closely related thread:
How to reduce CED paint thickness?
Q. How to increase the thickness of electrophoretic paint (linseed oil base) about 35 to 45 microns?Ammar ahmad
- Rawalpindi Pakistan
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