Ask the Expert Question-and-Answer Archive

by Ron Joseph

March, 2009

Surface Preparation

Q. We are a producer of non-stick aluminum cookware. We use water based coatings suitable for food contact. We are seeking an alternative way to prepare the surface of the aluminum for the optimum adhesion of the coating. At the moments we use acid without electricity (ex. anodizing). Can you please suggest a way that will offer optimum paint adhesion and still be hygienic?

A. I suggest you investigate the chemical pretreatments provided by companies such as Henkel Surface Technologies, Chemetall and others. I don't know anything about your manufacturing capabilities, but you should be able to find a suitable pretreatment for your purposes. Also, I suggest you investigate the new non-chromate pretreatments that comprise zirconium-titanate or silane technologies. They are relatively new and might be cost effective for your application.

Regardless of the pretreatment you select, I suggest that you conduct experiments to insure that they will stand up to the high temperatures that are encountered during cooking.

If you seek more consulting advice, I will be happy to assist you further on a contractual basis. Please get back to me if you would like to pursue this further.

Regards,

Ron Joseph