CORROSION BEHAVIOR OF 6.5%Cr STEEL IN HIGH TEMPERATURE AND HIGH PRESSURE CO2 ENVIRONMENT

doi:10.11900/0412.1961.2015.00559

Acta Metall Sin

2016, Vol. 52

Issue (6): 672-678 DOI: 10.11900/0412.1961.2015.00559

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CORROSION BEHAVIOR OF 6.5%Cr STEEL IN HIGH TEMPERATURE AND HIGH PRESSURE CO₂ENVIRONMENT

Lining XU(

),Bei WANG,Minxu LU

Corrosion and Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

Cite this article:

Lining XU,Bei WANG,Minxu LU. CORROSION BEHAVIOR OF 6.5%Cr STEEL IN HIGH TEMPERATURE AND HIGH PRESSURE CO₂ENVIRONMENT. Acta Metall Sin, 2016, 52(6): 672-678.

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Abstract

In the oil and gas industry, CO₂ in reservoirs generally causes severe corrosion of C steel in pipelines. Adding Cr to C steel can enhance CO₂ corrosion performance by a factor of at least 3, and even up to 10 times and more, whilst maintain a cost penalty less than 1.5 times that of C steels. Corrosion behavior of 6.5%Cr steel in high temperature and high pressure CO₂ environment is investigated in this work. The corrosion rate of 6.5%Cr steel at 80 ℃ and 0.8 MPa is measured by autoclave. The surface and cross-sectional morphology is studied by SEM, and the enrichment of Cr in the corrosion scale is investigated by EDS. The change of LPR and EIS results with corrosion time is studied by high temperature and high pressure electrochemical tests. According to the test results of ion concentration in the solution, the mechanism of corrosion scale growth is discussed. The results show that the corrosion rate of 6.5%Cr steel is 0.72 mm/a. The Cr enriches in the corrosion scale, and the Cr/Fe ratio is higher than 5∶1. Under different corrosion time, the concentration of Cr³⁺ in the solution is always low, which demonstrates that Cr seldom enters into solution.

Key words: 6.5%Cr steel CO2 corrosion high temperature and high pressure corrosion scale Cr enrichment

Received: 04 November 2015

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	Lining XU
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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00559 OR https://www.ams.org.cn/EN/Y2016/V52/I6/672

Fig.1 Microstructure of 6.5%Cr steel

Fig.2 Schematic of high temperature and high pressure (HTHP) autoclave used to perform weight loss test

Fig.3 Schematic of HTHP autoclave used to perform electrochemical test (WE, CE and RE—working, counter and reference electrode)

Fig.4 Macroscopic morphologies of 6.5%Cr steel exposed under 80 ℃ and 0.8 MPa CO₂ partial pressure for 240 h (a) before pickling (b) after pickling

Fig.5 Corrosion scales microscopic morphologies of 6.5%Cr steel exposed for 120 h (a) and 240 h (b), and EDS analysis of white particle (c)

Fig.6 Cross-sectional microscopic morphologies (a, b) and corresponding EDS analyses (c, d) of 6.5%Cr steel scale exposed for 120 h (a, c) and 240 h (b, d)

Fig.7 Cross-sectional SEM image of specimen exposed for 120 h (a), and EDS map scanning morphologies of Cr (b), Fe (c) and O (d)

Fig.8 Linear polarization resistance (R_p) result of 1/R_p varying with time (t)

Fig.9 Nyquist diagram of 6.5%Cr steel exposed at different times

Table 1 Ion concentration of the test solution near the 6.5%Cr steel surface after high temperature and high pressure CO₂ corrosion under different times

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