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I see posts that say to get the ammonia out of the barrel right away. This would be foreign to me because I used to work with ammonia in large plant refrigeration and all steel piping was used, so there must be some other reason to get it out of the barrel.
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I am puzzling about that too. Ammonia attacks copper and brass but should be safe on steel.
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Take a look at this report on ammonia vapors and note the numbers for galvanized steel.
http://age-web.age.uiuc.edu/bee/RESE...sion/nh3-1.htm
Any time you have an elecrolytic solution in contact with more than one metal, you run the risk of setting up a galvanic reaction where one metal is oxidized as another is reduced. Ferric based metals are extremely easy to oxidize, as referrenced in this table:
http://inspectapedia.com/BestPractices/Table2-11.jpg
For those of us who don't want ammonia solutions hanging around our rifle bore too long, it is the same reason you run dry patches and then an oiled patch down your bore at the end of a cleaning session, to get all the aqueous solution out, and protect the steel.
I hope this is helpful.
Jimro