Prolonging lifetime of stack

[Birdland Sugarbush]

My stovepipe seems to last 2 years max. Is there anything I can do to prolong the life?

I’m using black stovepipe. It’s kept indoors, but it still has rust spots on it and I find that after 2 seasons I need to replace it.

[mdm1]

I went to stainless this year. Should last a lot longer I hope.