Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Spectral Analysis of $CO_2$ Corrosion Product Scales on 13Cr Tubing Steel

  • Lin, Guan-fa (The Key Laboratory for Mechanical and Environmental Behavior of Tubular Goods, CNPC) ;
  • Xu, Xun-yuan (PetroChina Tarim Oilfield Compamy) ;
  • Bai, Zhen-quan (The Key Laboratory for Mechanical and Environmental Behavior of Tubular Goods, CNPC) ;
  • Feng, Yao-rong (The Key Laboratory for Mechanical and Environmental Behavior of Tubular Goods, CNPC)
  • Published : 2008.08.01
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Abstract

$CO_2$ corrosion product scales formed on 13 Cr tubing steel in autoclave and in the simulated corrosion environment of oil field are investigated in the paper. The surface and cross-section profiles of the scales were observed by scanning electron microscopy (SEM), the chemical compositions of the scales were analyzed using energy dispersion analyzer of X-ray (EDAX), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) to confirm the corrosion mechanism of the 13 Cr steel in the simulated $CO_2$ corrosion environment. The results show that the corrosion scales are formed by the way of fashion corrosion, consist mainly of four elements, i.e. Fe, Cr, C and O, and with a double-layer structure, in which the surface layer is constituted of bulky and incompact crystals of $FeCO_3$, and the inner layer is composed of compact fine $FeCO_3$ crystals and amorphous $Cr(OH)_3$. Because of the characteristics of compactness and ionic permeating selectivity of the inner layer of the corrosion product scales, 13 Cr steel is more resistant in $CO_2$ corrosion environment.

Keywords

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