Effect of ferrite morphology on pitting corrosion resistance of austenitic stainless steel weld metals

Kadoi, Kota; Kogure, Michihiko; Inoue, Hiroshige

doi:10.1016/j.corsci.2023.111356

Cited by 7 publications

(1 citation statement)

References 14 publications

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“…To ensure the adequacy of the hydrocracking process, the amount of hydrogen added to the process often exceeds the actual demand. It has been shown in the literature that excessive and prolonged hydrogen is one of the main causes of failure in heat exchanger materials in oil production, such as duplex stainless steels (Li et al, 2023a(Li et al, , 2023b and austenitic stainless steels (Kadoi et al, 2023). The high-temperature Incoloy 825 is also frequently used in the manufacture of hydrogenation heat exchangers because of its excellent corrosion resistance and mechanical properties (Liu et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrogen on the pitting corrosion behavior of Incoloy 825

Li,

Yao,

Guan

et al. 2024

ACMM

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Purpose In this paper, the authors aim to study the effect of hydrogen on the pitting corrosion behavior of Incoloy 825, a commonly used material for heat exchanger tubes in hydrogenated heat exchangers. Design/methodology/approach The pitting initiation and propagation behaviors were investigated by electrochemical and chemical immersion experiments and observed and analyzed by scanning electron microscope and energy dispersive spectrometer methods. Findings The results show that hydrogen significantly affects the electrochemical behavior of Incoloy 825; the self-corrosion potential decreased from −197 mV before hydrogen charging to −263 mV, −270 mV and −657 mV after hydrogen charging, and the corrosion current density increased from 0.049 µA/cm2 before hydrogen charging to 2.490 µA/cm2, 2.560 µA/cm2 and 2.780 µA/cm2 after hydrogen charging. The pitting susceptibility of the material increases. Originality/value Hydrogen is enriched on the precipitate, and the pitting corrosion also initiates at that location. The synergistic effect of hydrogen and precipitate destroys the passive film on the metal surface and promotes pitting initiation.

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