What question did this study set out to answer?

Investigate the hot corrosion behavior, oxide scale evolution, and degradation mechanisms of dissimilar welded joints between P91 and P22 steels in a high-temperature molten salt environment.

August 19, 2026Canadian Metallurgical Quarterly

Effects of chlorides and sulphates on molten salt hot corrosion of dissimilar welded joints of 70 MW circulating fluidised bed combustion power plant super-heaters tubes

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Authors

SPS. Senthur Prabu RKRoyal George Kurissuveettil RCRajendran Chinnasamy

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Overview

Experimental study reveals superior hot corrosion resistance in weld metal compared to P22 base steel under molten salt exposure, highlighting methods to improve power plant tube durability.

Key Points

Investigate the hot corrosion behavior, oxide scale evolution, and degradation mechanisms of dissimilar welded joints between P91 and P22 steels in a high-temperature molten salt environment.
Fabricated dissimilar joints between SA335 P91 and SA218 P22 steels using pulsed current gas tungsten arc welding (PCGTAW) with E70S-2 filler metal.
Exposed the welded samples to a molten salt mixture (K2SO4 + NaCl) at 700 ± 2°C across 50 thermal cycles.
Evaluated corrosion kinetics, phase evolution, and microstructural degradation using scanning electron microscopy, thermogravimetric analysis, X-ray diffraction, and energy-dispersive spectroscopy.
The weld metal exhibited superior hot-corrosion resistance due to the formation of a dense, protective Cr2O3-rich oxide scale.
The P22 base steel region experienced localized hot corrosion attack accompanied by significant oxide scale spallation during thermal cycling.

Cite This Study

Prabu et al. (2026) studied this question.

synapsesocial.com/papers/6a85643903308d306e2d7dec https://doi.org/10.1080/00084433.2026.2717668

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August 19, 2026Canadian Metallurgical Quarterly

Effects of chlorides and sulphates on molten salt hot corrosion of dissimilar welded joints of 70 MW circulating fluidised bed combustion power plant super-heaters tubes

View Full Paper

Ask AI

Bookmark

Authors

SPS. Senthur Prabu RKRoyal George Kurissuveettil RCRajendran Chinnasamy

Discussion

Member takes

Overview

Experimental study reveals superior hot corrosion resistance in weld metal compared to P22 base steel under molten salt exposure, highlighting methods to improve power plant tube durability.

Key Points

Investigate the hot corrosion behavior, oxide scale evolution, and degradation mechanisms of dissimilar welded joints between P91 and P22 steels in a high-temperature molten salt environment.
Fabricated dissimilar joints between SA335 P91 and SA218 P22 steels using pulsed current gas tungsten arc welding (PCGTAW) with E70S-2 filler metal.
Exposed the welded samples to a molten salt mixture (K2SO4 + NaCl) at 700 ± 2°C across 50 thermal cycles.
Evaluated corrosion kinetics, phase evolution, and microstructural degradation using scanning electron microscopy, thermogravimetric analysis, X-ray diffraction, and energy-dispersive spectroscopy.
The weld metal exhibited superior hot-corrosion resistance due to the formation of a dense, protective Cr2O3-rich oxide scale.
The P22 base steel region experienced localized hot corrosion attack accompanied by significant oxide scale spallation during thermal cycling.

Cite This Study

Prabu et al. (2026) studied this question.

synapsesocial.com/papers/6a85643903308d306e2d7dec https://doi.org/10.1080/00084433.2026.2717668

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