I use triple wall: SS inner, alum mid, galv. steel outer. Don't see any problems with corrosion on that.
On the fire, if you can cut the oxygen to it. On my free standing sealed stove, all I have to do is close the damper and the fire will suffocate. Have never had a fire in over 33 years.
I burn a couple of cords a year with a vertical pipe. I don't clean it till fall getting ready for another season. Sometimes I don't need to clean it. All the creosote has dried up, cracked and has fallen into the stove. Inner pipe is 8" and I have an 8" wire chimney cleaning brush that works very well when needed.
Burning a good, non sappy wood that has been properly cured helps. I like to burn oak at least 3 months after cutting, prefer 6 or sometimes buy one year to burn the next if green.