I think you're probably going to be looking at nickel alloys. The most commonly available one that might work for your service is C276.
If there is a fair amount of air exposure or other oxidizer, then C-22 will probably work better. I've seen C-22 come out of a 3 day 6% FeCl3 test with mirror...
Not hydrogen, just massive amounts of aluminum chloride at rates that will knock your socks off (and possibly start a fire).
Archer and Simpson, "Chemical Profile of Polychoroethanes and Polychloroalkenes," Ind. Eng. Chem., Prod. Res. Dev., Vol. 16, No. 2, 1977, pp 158-162, showed...
