The Voice of the Finishing Industry since 1936

  • PF Youtube
  • PF Facebook
  • PF Twitter
  • PF LinkedIn
12/1/2008 | 1 MINUTE READ

Clear E-coat vs. Anodizing

Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon

I can not find a specification for clear E-coating on aluminum castings. Can you help?

 Q. I am working on a project, and the customer is insisting on anodizing (10 µm thickness) an aluminum casting made from A413 cast aluminum. I don’t believe the surface finish will come out very good. I have told them that we can clear E-coat the part and get the same protection. The problem is that I can not find a specification for clear E-coating on aluminum castings to show them.
Can you help? G.T.

 

A. For starters, I am going to assume your project does not have enough volume to justify its own E-coat line.
I suspect your customer is suggesting anodizing because they know it is a widely accepted and standard process for aluminum substrates. Also, a lot of good things have been done in recent years with anodizing processes. And, perhaps they feel it would be more likely that they can find a reasonably located source for anodizing.

E-coat lines with the capability to apply clear paint are very rare. When they do exist, they are usually captive within a manufacturing plant, and the pretreatment process is designed for the substrate to be coated for the products that plant makes. In addition, when applying a clear coating, pretreatment system selection is critical in order to maintain the visual integrity of the surface. So, there might not be a coater that can or would be capable or willing to do this within reasonable geographic range for logistical purposes.

However, if you still want to look for something like a specification, you might contact some of the suppliers of E-coat paints and ask them if they have a data sheet for one of their clear E-coat materials that might be appropriate for what you are trying to do. You can get information about E-coat paint suppliers on the Web site for The Electrocoat Association, www.electrocoat.org.

Related Topics

RELATED CONTENT

  • Cyanide-Free Electroplating of Cu-Sn Alloys

    This paper is a peer-reviewed and edited version of a presentation delivered at NASF SUR/FIN 2012 in Las Vegas, Nev., on June 13, 2012.

  • 2020 Vision: The Future of Coatings

    The year 2020 will be here before you know it, signaling the beginning of a new decade and bringing changes to the world as we know it.

  • Measuring the Surface Area of Fasteners

    How do you measure the surface area of a threaded fastener? How much coating would you put on it? How thick of a coating? What about non-threaded fasteners? The U.S. Department of Agriculture’s Forest Service, of all people, may have come up with the solution for those pondering how to coat sometimes-difficult small pieces using computer imaging and software to compute the area.


Resources