Question on rust/corrosion spots on lens mount

[Joe Wilensky]

My ESII was in KEH bargain condition, and works very nicely, but 
there were a few patches of corrosion/rust along the edge of the lens 
mount. I used one of those battery contact cleaner pens on the spots 
to smooth them out a bit. The spots look like this:

http://homepage.mac.com/wilensky/eBay/ES_mount_bottom.jpg
http://homepage.mac.com/wilensky/eBay/ES_mount_top.jpg
The areas don't extend onto the mount itself where the rear of the 
lens mount would come into contact with them, but it's close. My 
question is, is there anything I can do to these spots to 
oxidize/seal them or cover them over? Any particular product or 
method? I'd like to stop any further corrosion or discoloration of 
other areas. I don't plan on exposing the camera to salt water or 
nasty weather, but still ... any advice?

Joe