Hot answers tagged rust-removal
From my point of view this metal part is a base plate which makes it possible to mount the fan onto the plastic parts. As RedGrittyBrick noted, it is (or better was) zinc-plated. It seems to me, that most of the zinc layer is oxidized and cannot provide galvanic protection anymore. So why did it loose the zinc layer so quickly? If it was behind a cover ...
You may very well be best advised to purchase a replacement fan assembly. It will come with a properly plated base plate. When you replace it then properly plug it in and reinstall the cover panel assembly. You should not operate the freezer without the cover in place so that the fan circulates the air inside the unit in the proper manner.
Only top voted, non community-wiki answers of a minimum length are eligible