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Influence of Chromium on CO2/H2S Corrosion Behavior of X100 Grade Pipeline Steel

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Abstract:

Four kinds of X100 grade pipeline steels containing different chromium content were designed and corrosion behavior were studied in order to confirm the influence of Cr on the properties of high grade pipeline steel. The corrosion experiments demonstrated that Corrosion rates of Four steels in the experiment decrease with the increasing of Cr content, and the scales on the four steels have a two-layer structure under the corrosion of CO2 and H2S. The outer layer is mainly composed of FeS or FeS1-x and the inner layer consisted of FeCO3. Cr enriches in the inner layer and Cr content of the inner layer increases with the Cr content in matrix. The Cr enrichment enhanced the compactness of the scales further hindered the diffusion of ions from liquid to the surface of steel. The corrosion scale with Cr(OH)3 is anion-selective and reduce the amount of anion reaches metal surface, thus reducing corrosion rate.

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Periodical:

Advanced Materials Research (Volume 662)

Pages:

309-314

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.662.309

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Online since:

February 2013

Authors:

Jun Sheng Zhang, Hui Bin Wu, Li Dong Wang, Di Tang, Li Fu Liu

Keywords:

Co2/h2S Corrosion, Corrosion Product Scale, Cr Content, X100 Grade Pipeline Steel

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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