Corrosion Behavior of Low-Alloy Steel in COT Upper Deck O₂-CO₂-SO₂-H₂S Moisture Environment

Abstract:

This paper focus on the development of low-alloy anti-corrosion steel for the upper deck of COT(cargo oil tank), and the corrosion behavior of Cr-containing low-alloy steels in O₂-CO₂-SO₂-H₂S moisture were studied using homemade COT corrosion simulation device. After the corrosion experiment, related corrosion data was measured, and macro morphology and structure of corrosion scale were observed by SEM(Scanning Electron Microscope). The phase and chemical composition of corrosion product film were analyzed by XRD(X-ray diffraction) and EDS(energy dispersive spectroscopy). The effect of misorientation distribution on anti-corrosion property of steel was investigated by EBSD(electron backscattered diffraction). Based on the results, corrosion scale of COT on the upper deck consist of α-FeOOH, γ-FeOOH, FeS₂, S and Fe_1-xS, and the type of corrosion is mainly general corrosion. Cr enrichment was found on the inner corrosion product film, the addition of Cr leads to the increasing of low-angle grain boundaries and sub-grain structure which is conducive to the improvement of corrosion resistance.

• Periodical: Advanced Materials Research (Volumes 652-654)
• Pages: 916-922
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.652-654.916
• Online since: January 2013
• Authors: Jin Ming Liang, Di Tang, Peng Cheng Zhang, Hui Bin Wu, Hong Yan Mao, Xiao Tong Liu
• Keywords: Corrosion Product Film, Cr, Misorientation Distribution, O₂-CO₂-SO₂-H₂S, Upper Deck of COT

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