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CED coating process questions
Intro / synopsis: CED (Cathodic electrodeposition), Electrocoating, Electropainting, and Electrophoretic Lacqueringare all terms for a coating process which is similar to electroplating in that the parts are immersed in a bath and electricity causes the deposition of the paint.
The principal advantages of electrodeposition are that the coating can be extremely thin and very uniform because the paint which is deposited is insulating, which drives the electricity to flow to any uncoated area. It is a process which generates very little waste and does not require evaporation of solvents. It can be a final finish or a prime coat.
This site includes numerous threads with full discussions of various aspects of the process. Please search the site with a well detailed question to zero in on the most helpful thread.
adv.
Q. Hi,
Paint ooze out observed on the parts after process is complete. What are the contributing factors for paint ooze out in CED process?
Quality - Tamilnadu, India
November 21, 2023
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for Shops, Specifiers, & Engineers (affil links)
"Electrocoats: Formulation and Technology" by Bruggemann & Rach (2020)
avail from eBay, AbeBooks, or Amazon
"Electrophoretic Deposition (EPD)" by Nathan Bass (2017)
avail from eBay, AbeBooks, or Amazon
"Electrocoating: a Guidebook for Finishers" by Electrocoat Association (2010)
avail from Amazon
"Electrodeposition" by Rodger Talbert (1996)
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"Electropainting: A survey of principles and practice" by Reginald Leslie Yeates (1980)
avail from AbeBooks, or Amazon
"Handbook of Electropainting Technology" by W. Machu (1978)
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Q. Sir please can you tell me the standard process for CED coating.
keshav nandamuri- Chennai-Tamilnadu, India
July 18, 2008
A. In simple steps: Pre treatment (iron phosphate, zinc phosphate or newer nano coatings), E-coat and Bake. Not a rule but generally online de-rusting is not present in the pre treatment line. Depending upon the component and the performance expected Passivation / Sealer dip may or may not be present. A typical line could look like - Degrease, Degrease, WR, WR, Activation / Surface conditioning, Phosphating, WR, DI WR, DI WR, E-coat, Permeate Rinse, Permeate Rinse, DI WR and then bake. I hope this answers your question.
Gurvin SinghMohali, Punjab, India
Q. Sir, can you tell me why "Activation" process is needed in CED coating?
Paresh Patil- India
October 17, 2012
Q. Hi All,
We currently subcontract our panels for cataphoresis. Recently we have had rejects from our customer with a "marbling/running effect" down to face of the parts. Our supplier is adamant that it is the material which is at fault, but we have checked the material and can find no issue with this whatsoever. Has anybody seen/heard this issue before and found the root cause?
Material is 1 mm thick stainless steel.
- Scotland
October 17, 2012
A. If the raw uncoated steel does not have the same grain pattern as you are seeing over the painted surface, then the paint job or phosphating pretreatment is not good enough.
Khozem Vahaanwala
Saify Ind
Bengaluru, Karnataka, India
December 28, 2012
Q. We are Job Coaters based in Pune, India. One of our customers wants CED coating on Brass components. What is the pretreatment recommended for this?
Sriram
- Pune, Maharashtra, India
November 21, 2014
Permeate ooze-out in CED coating
Q. Hello my dears ... I have working on CED system for car bodies. How to reduce the permeate ooze-out (cathodic electrodeposition) during electro deposition? Please help me.
Munusamy Perumaltamilnadu, kanchipuram, India
November 30, 2015
Q. I have a problem to applying CED Coating on brass metallic surface, generally giving recommended voltage and time to brass material and giving 200 °C temperature to oven. There is problem occurring on the edge of the material that applied coating is not staying at edge of material so that the edges will remain simply and not sucked the colour. Experts please give me right solution.
Bhargav patel- Rajkot Gujarat
December 20, 2021
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