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topic 7668

What is ELECTROPHORETIC LACQUER?


(2001)

Q. We are somewhat confused by the definition of electrophoretic lacquer. Could you please explain in layman's terms how it is applied and any other tech details to help me decide if it is better than oven baked lacquer?

STEPHEN ROBERTS
- Devon, UK


Electrocoating: a Guidebook for Finishers




Handbook of Electropainting Technology

(2001)

A. Hi there,

Electrophoretic lacquer and oven baked lacquer you mentioned may not be necessarily two different things. Lacquer coating may be applied by any route from a simple dipping to the more sophisticated electrophoretic method (EPD: electrophoretic deposition) as indicated. It is understood that drying in air flow or with the further application of heating/baking (such as in a oven) is usually necessary to remove the lacquer solvents or moisture residue.

As a general coating technique, EPD relies on the migration and deposition of charged particles from a solution onto an opposite-polarity substrate (workpiece) under the application of an external power supply. The solution must be colloidal type, and depending on the solution pH, the loaded suspension particles (oxides or other ceramics) or macromolecules (such as acrylic resins) can acquire either positive or negative surface charges on surface, which make them mobile under E-field. EPD differs from processes such as electroplating in that it deposit fine particles as opposed to ions. One of the most established industrial applications of EPD is the formation of paint coat [primer] on car bodies. In terms of merits, EPD has high throwing power, thus coating is more adherent and better able to cover small holes or crevices than dip coating.

Hong-Wei Wang
- Manchester, UK


August 15, 2008

Q. Hello,

Kindly please need your feedback.

Is it possible to color the nickel plated parts after process called Electrophoretic Lacquer?
Thank you.

Regards,
xenicinth

Xenicinth Eng
Engineer - Malaysia


August 19, 2008

A. Hi, Xenicinth. If I understand your question correctly, yes. In fact, a lot of brass colored components such as lamp parts contain no brass, but are actually nickel plated and then electrophoretically lacquered with a lacquer that has a brass colored tint.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


August 22, 2008

A. Hi,Xenicinth
CED is basically cathodic electrodeposition lacquer which is clear. We may convert into colored clear or opaque by help of colors. That means we can do the color coating in any of the conductive metal substrate.

Chandresh Varsani
- Rajkot, Gujarat, India



ACRONYMS:

GPC or PGC = potassium gold cyanide

December 29, 2015

Q. Hello,
We are doing Gold plating on jewellery items by GPC. But the after some time the plated items are deplated. Is it possible to do EPD to increase life and adherence of items in terms of EPD process.

Yash Sonar
elecroplaters - Nandurbar, Maharashtra



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