there's actually tools that you're supposed to use to get rust and burrs off of your edges called gummy stones i think. here's a link to some. but yeah if you get rust on your edges you definitely want to buy one of these because your edges are a huge part of your speed and edge hold.
One Ball Jay Gummy Stone fine : Snowboard Tool
Ski Snowboard Steel Edge Deburring Polishing Tools
here's a tutorial on tuning your board if you need it:
snowboard tuning tutorial