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Chrome-free coating for pretreatment of car bodies?

I am a ChE student at Oregon State University and am doing research on pre-painting coating processes for car bodies. The process is a phosphate conversion coating but my question is regarding the post-treatment: Is there an alternative to using chromic acid in an immersion chrome/water rinse stage? Any advice is greatly appreciated.

Ilanya Strauss
- Corvallis, OR
1999

It sounds as though you have a particular process in mind which uses a chrome rinse after phosphate coating, but I haven't heard of it.

Do you have a specification number you can give to us on-line?

Best wishes,

Tom Pullizzi
Falls Township, Pennsylvania

Hi, Ilanya. If the body is to be electrocoated, and most are, I think it is pretty common to just use DI water as the rinse after phosphate and before e-coat.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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