Rust won't just stop on its own, like you posted it will continue to live and grow, but a coating of oil will usually make it at least go to sleep.
Soak the rust area in a light oil for a day or two, then "scrub" it with a bit of old panty hose (ASK FIRST...get a ruined pair from your wife or grilfriend....if they're your panty hose, i really don't want to know about it). That's about as gentle a treatment as i can think of....but be aware that rust has already taken away the blue, so once you take away the rust will be no blue under the rust spots.
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