Discussion on the Mechanism of Corrosion Resistance of High Temperature QPQ Treated Specimens in H2S Environment

Yuan Hui Li; Shi Ping Zhang; Yi Chao Ding; Zi Lian Jiang

doi:10.4028/www.scientific.net/AMM.66-68.665

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 66-68Discussion on the Mechanism of Corrosion...

Discussion on the Mechanism of Corrosion Resistance of High Temperature QPQ Treated Specimens in H₂S Environment

Abstract:

By constant stress tensile test, the corrosion mechanism of high temperature QPQ treated 25CrMnMo steel specimen in H₂S environment was analyzed and discussed. The γ′-Fe₄N in the ε compound layer turns into corrosion substance in the test and expands. At the surface of the ε compound layer, the corrosion layer is visible. The compound layer breaks off in little blocks for volume expansion of the corrosion substance and the exterior tensile stress. The coefficient of diffusion of hydrogen atom in the ε compound layer is very low, that decrease the probability of the hydrogen-induced corrosion of high temperature QPQ treated specimens in H₂S environment.

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Periodical:

Applied Mechanics and Materials (Volumes 66-68)

Pages:

665-668

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.66-68.665

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Online since:

July 2011

Authors:

Yuan Hui Li, Shi Ping Zhang, Yi Chao Ding, Zi Lian Jiang

Keywords:

Corrosion Resistance, H₂S Corrosion Resistance, High Temperature QPQ Technology, Salt Bath Nitriding

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References

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