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topic 60934

How to Increase DFT Paint Thickness in Cathodic Electrodeposition (CED) system?

Current question and answers:

March 27, 2021

Q. Dear sir;
I am working CED line for past 8 years. I faced a lot of problems and I found solutions for them all, but now we are facing a new problem for past 2 years, and it's increasing gradually:

Low DFT --
Components are coated with less dft (lower side) remaining sides are uncoated with zero dft (upper side) of same components.

Please someone give a solution for this problem.

Thanks all.

BALA mani
- CHENNAI TAMILNADU
^- Reply to this post -^

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Previous closely related Q&A's starting in:

affil. link
Electrocoating: a Guidebook for Finishers
by Electrocoat Association
from Abe Books
or

2007

Q. Thickness problem: Is there any relation between thickness of CED coating & and anolyte conductivity?

Avinash Vidhate
Director - Nashik, Maharashtra, India
^- Reply to this post -^


2007

A. There is no relationship between CED film thickness and anolyte conductivity as long as your CED bath conductivity and anolyte conductivity is within the spec.

Anions (CH3COO-) are generated during CED process and it is moving to Anolyte system through semi permeable membrane at the anodes thereby the conductivity of anolyte increases and replenished with DI (maintained with in the spec between 400 - 400 microsiemens). If anolyte system is not removing the Anions then it will be remain in CED bath then the conductivity of bath slowly increases making a difference in film formation.

Please check paint supplier for Bath conductivity and Anolyte conductivity spec.

P.M.Saravanan
P.M.Saravanan
   paint shop manager
Chennai, Tamilnadu, India




How to increase Electrophoretic DFT (linseed oil base)

Closely related thread:
  How to reduce CED paint thickness?

February 25, 2018

Q. How to increase the thickness of electrophoretic paint (linseed oil base) about 35 to 45 microns?

Ammar ahmad
- Rawalpindi Pakistan
^- Reply to this post -^



January 31, 2019

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

Q. I am Working In CED Paint shop. We are applying 230 V and
pH - 5.82
Conductivity - 1452
NVM - 16.82

But DFT is coming in 5- 10 Micron. Please Tell me How to increase DFT on CED components?

Satish Kumar
CED Paint Shop - Faridabad Haryana
^- Reply to this post -^

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