Browse Publications Technical Papers 2020-28-0422
2020-09-25

Hot Corrosion Demeanour of Key-Hole Plasma Arc Welded Aerospace Grade Hastelloy X in Molten Salts Environment 2020-28-0422

The current work investigates the hot corrosion demeanour of Hastelloy X weldment produced with autogenous mode through key-hole plasma arc welding. The hot corrosion test has been performed for weldment in molten salt-1 (MS-1) (75 % Na2SO4 + 25 % V2O5) and molten salt-2 (MS-2) (75 % Na2SO4 + 20 % V2O5 + 5 % NaCl) circumstance for 25 hrs (25 cycles) at 900 °C. The MS-1 substrate of both base metal and weldment provided the lowest weight gain than the MS-2 substrate. The NaCl in the MS-2 causes the severe hot corrosion on the substrate whereas absence of NaCl in MS-1 reduces the hot corrosion effects. All the tested substrate follows the parabolic rate law and the highest parabolic constant is observed for plasma weldment in MS-2 condition. The tendency of hot corrosion resistance follows the order of, Base Metal <Plasma MS-1 <Base Metal MS-2 <Plasma MS-2. The occurrence of protective phases like chromium oxides (Cr2O3), spinel oxides (NiCr2O4 and NiFe2O4) Nickel oxide (NiO) on the substrate resist the further oxidation. But, the development of MoO3 and Fe2O3 phases are increased the cracking as well as spallation rate which promotes severe corrosion of the substrates. The plasma arc welded substrate in MS-1 condition is giving the better resistance than MS-2 at 900 °C.

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