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1. FeS Corrosion Products Formation and Hydrogen Uptake in a Sour Environment for Quenched & Tempered Steel

Author

Elien Wallaert, Tom Depover, Iris De Graeve, and Kim Verbeken

Subjects
Quenched &amp, Tempered (Q&amp, T) steel, H2S, electron probe micro-analyzer (EPMA), X-ray diffraction (XRD), hydrogen absorption, Mining engineering. Metallurgy, TN1-997
Abstract

Surface corrosion product formation is one of the important factors affecting the corrosion rate and hydrogen uptake in a H2S environment. However, it is still unclear how the base material composition will affect the corrosion products that are generated, and consequently their impact on the corrosion rate. In this paper, corrosion product formation and the impact of the Mo content of the base material on the composition of the corrosion products and hydrogen absorption in a sour environment was investigated. The corrosion layer was composed of a double layered mackinawite (FeS1−x) structure, which was enriched with molybdenum and chromium. The layers were formed via two different mechanisms, i.e., the inner layer was created via a general oxide film formation corrosion mechanism, whereas the upper layer was formed by a precipitation mechanism. The presence of this double corrosion layer had a large influence on the amount of diffusible hydrogen in the materials. This amount decreased as a function of contact time with the H2S saturated solution, while the corrosion rate of the materials shows no significant reduction. Therefore, the corrosion products are assumed to act as a physical barrier against hydrogen uptake. Mo addition caused a decrease in the maximal amount of diffusible hydrogen.

Published
2018
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2. FeS corrosion products formation and hydrogen uptake in a sour environment for quenched & tempered steel

Author

Tom Depover, Kim Verbeken, Iris De Graeve, Elien Wallaert, Vrije Universiteit Brussel, Architectural Engineering, Electrochemical and Surface Engineering, In-Situ Electrochemistry combined with nano & micro surface Characterization, and Materials and Chemistry

Subjects
lcsh:TN1-997, Materials science, Hydrogen, 020209 energy, Oxide, chemistry.chemical_element, 02 engineering and technology, engineering.material, X-ray diffraction (XRD), Corrosion, T) steel, HS, Chromium, chemistry.chemical_compound, Materials Science(all), Mackinawite, 0202 electrical engineering, electronic engineering, information engineering, Tempered (Q&amp, General Materials Science, lcsh:Mining engineering. Metallurgy, Quenched & Tempered (Q&T) steel, Electron probe micro-analyzer (EPMA), H2S, Precipitation (chemistry), Metals and Alloys, Quenched &amp, electron probe micro-analyzer (EPMA), hydrogen absorption, 021001 nanoscience & nanotechnology, Hydrogen absorption, Chemical engineering, chemistry, Molybdenum, engineering, 0210 nano-technology, Layer (electronics)
Abstract

Surface corrosion product formation is one of the important factors affecting the corrosion rate and hydrogen uptake in a H2S environment. However, it is still unclear how the base material composition will affect the corrosion products that are generated, and consequently their impact on the corrosion rate. In this paper, corrosion product formation and the impact of the Mo content of the base material on the composition of the corrosion products and hydrogen absorption in a sour environment was investigated. The corrosion layer was composed of a double layered mackinawite (FeS1−x) structure, which was enriched with molybdenum and chromium. The layers were formed via two different mechanisms, i.e., the inner layer was created via a general oxide film formation corrosion mechanism, whereas the upper layer was formed by a precipitation mechanism. The presence of this double corrosion layer had a large influence on the amount of diffusible hydrogen in the materials. This amount decreased as a function of contact time with the H2S saturated solution, while the corrosion rate of the materials shows no significant reduction. Therefore, the corrosion products are assumed to act as a physical barrier against hydrogen uptake. Mo addition caused a decrease in the maximal amount of diffusible hydrogen.

Published
2018

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