Iron Meteorites can be notorious for rusting.  It is a real problem for collectors and institutions alike. Because of the potential cost of the loss, many methods have been invented to halt or prevent rusting. Unfortunately few of them work.

However, there are some methods that work extraordinarily well. The problem inside of the meteorite community, is getting the word out on which method works.

Iron Conservation of Shipwreck Iron page 1

http://nautarch.tamu.edu/crl/conservationmanual/File10a.htm

http://nautarch.tamu.edu/crl/conservationmanual/File10b.htm