INVESTIGATION OF STRUCTURE AND MECHANICAL PROPERTIES OF CO2 CORROSION SCALE FORMED UNDER VARIOUS FLOW RATES

J Chin Soc Corr Pro

2009, Vol. 29

Issue (6): 401-404 DOI:

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INVESTIGATION OF STRUCTURE AND MECHANICAL PROPERTIES OF CO₂ CORROSION SCALE FORMED UNDER VARIOUS FLOW RATES

YU Fang; GAO Kewei; LU Minxu

School of Materials Science and Engineering; University of Science and Technology Beijing; Beijing 100083

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Abstract

The structure and mechanical properties of CO₂ corrosion scale formed on X65 pipeline steel in simulated CO₂ corrosion environment in oil field under various flow rates were investigated. XRD and EDS analysis indicate that at static condition, the composition of the scale is (Fe,Ca,Mg)CO₃, while the scale changes to (Fe,Ca)CO₃ at dynamic conditions. The increment in flow rate increased the thickness of the scale remarkably, but had little influence on the hardness and Young's modulus of the scale. The fracture toughness of the scale exhibited the lowest value at the flow rate of 0.5 m/s, whereas the adhesion strength increased with increasing the flow rate.

Key words: X65 pipeline steel CO₂ corrosion corrosion scale flow mechanical properties

Received: 28 March 2008

ZTFLH:

TG172.9

Corresponding Authors: GAO Kewei E-mail: kwgao@mater.ustb.edu.cn

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Cite this article:

YU Fang GAO Kewei LU Minxu. INVESTIGATION OF STRUCTURE AND MECHANICAL PROPERTIES OF CO₂ CORROSION SCALE FORMED UNDER VARIOUS FLOW RATES. J Chin Soc Corr Pro, 2009, 29(6): 401-404.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2009/V29/I6/401

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