Coatings for Food Processing


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Q. What do you recommend for the refinishing of food processing equipment? The base material is cast iron. I have attached a couple of photos of the parts. N.H.


A. Based on the photos you e-mailed to me I believe your parts have a hot-dip tin coating. The simplest solution is to thoroughly clean the parts and then tin hot dip. You may have to remachine some of the interior surfaces to restore required tolerances.

You could also strip the hot dip tin layer and replate using an electrolytic tin plate. This is much more difficult since stripping of the tin requires a more complex stripping process than that used for tin electrodeposits. The hot dip tin forms an alloy interlayer between the iron and tin. Bottom line: Stick with the hot dip tin process!