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Do not sue me if this does not work but you could try removing the rust with Flitz and repainting the pipes with Gunkote.
www.brownells.com

GUN-KOTE™ OVEN CURE, GUN FINISH
GUN-KOTE™ OVEN CURE, GUN FINISH https://www.brownells.com/tools-cleaning/paint-metal-prep/paint-finishing/gun-kote-oven-cure-gun-finish/