Hot corrosion of two nickel-base superalloys under alkali sulfate deposition conditions

Pettersson, Rachel; Karlsson, Fredrik; Flyg, J.

doi:10.3184/096034009x462232

Cited by 5 publications

(2 citation statements)

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“…The sulfur from Na 2 SO 4 reacts with the elements in the specimens such as Ni, Cr, and Fe to form the NiS, FeS, and Cr 2 S 3 metal sulfides, as reported by following equations (9) to (12), which is confirmed by XRD. 16,18 The SEM microstructure of the weldment at the interface (Figure 7) shows that there are no cracks in the bare and weld metal region. The XRD result (Figure 6) reveals that Fe 2 O 3 is the main scale in the bare specimen, and moderate amounts of other phases NiO, NiCr 2 O 4 , and Cr 2 O 3 are present.…”

Section: Discussionmentioning

confidence: 99%

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Hot corrosion performance of bare and pulsed current welded Fe-based A-286 alloy in chlorine and sulphur environment

Dinek

Mohan

Jithesh

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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This present research work focuses on the hot corrosion performance of the base metal, weldment, and weld metal of A-286 alloy in sodium sulphate (Na2SO4)–5% sodium chloride (NaCl)–7.5% sodium metavanadate (NaVO3) (3SM) atmosphere at 700 °C. A pulsed current gas tungsten arc welding process is employed to make a similar joining of A-286 alloy using the filler material ERNiCrMo-3. The corrosion kinetics of the specimens has been determined using the thermo-gravimetric technique. The phase compositions of the reaction products are studied by X-ray diffraction, and the surface morphology of the scales is explored by scanning electron microscope analysis. The corroded samples are subjected to a cross-sectional study to ensure the corrosion attack and scales thickness using a SEM with elemental mapping technique. The result indicates that weldment showed better corrosion resistance than bare metal. A thick oxide scale could be found in the bare metal specimen than the weld metal. In the case of base metal, the formation of non-adherent and porous iron (III) oxide (Fe2O3) leads to rapid corrosion. The weight gain of weldment is about 1.96 and 1.13 times less than bare alloy and weld metal.

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