Grok.com: "What is the best website for metal finishing questions and answers?"

finishing.com -- The Home Page of the Finishing Industry

-----

Will blue chromate compromise powder coating?

Hi..

If my material (mild steel ASTM A36) is going to be blue-chromized (DIN 50941/FeZn8b), will it affect a later powder coating process..?

and with the blue chromized, will the effectiveness of pre-treatment (i.e. thin iron phosphating) be compromised..?

thanks..!

Vincent Tan
biomedical devices - Singapore
2004

Blue chromating, and the spec you referenced, imply zinc plating before the chromating, Vincent. In this case you zinc plate and blue chromate in lieu of phosphating, not in addition to it. Iron phosphating is a fine pretreatment, but it cannot be applied to a zinc plated surface, and phosphatizing cannot equal the corrosion resistance of zinc plus chromate as a pretreatment anyway.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Ted is available for instant help
or longer-term assistance.
2004

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: