Corrosion and Metal Transport In Fused Sodium Hydroxide: Part 2—Corrosion of Nickel-Molybdenum-Iron Alloys Available to Purchase

Studies were made of the corrosion by fused sodium hydroxide of nickel-rich alloys whose constituents were nickel, molybdenum, and iron exposed at 815 C for 100 hours. The reaction mechanism was found to involve the selective removal of iron and molybdenum from solid solution with nickel and a resultant formation of subsurface porosity. In most cases this porosity was shown to occur in the form of elongated pits which frequently followed tortuous paths and intersected to form a maze of subsurface channels.

Alloys of nickel, molybdenum, and iron containing at least 70 percent nickel showed more resistance to corrosion by sodium hydroxide melts at 815 C than any other alloys which have been tested. 4.7