Corrosion Behavior of X70 Mild Steel during Transportation of Gaseous- and Supercritical-CO2 Fluids

doi:10.11902/1005.4537.2015.120

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (3): 225-230 DOI: 10.11902/1005.4537.2015.120

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Corrosion Behavior of X70 Mild Steel during Transportation of Gaseous- and Supercritical-CO₂ Fluids

Xiu JIANG(

),Xiaoliang SONG,Dingrong QU,Xiaohui LIU

SINOPEC Research Institute of Safety Engineering, Qingdao 266071, China

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Abstract

The corrosion behavior of X70 mild steel was investigated in the case of water deposited in CO₂ pipeline by means of weight loss method and scanning electron microscopy (SEM). Results showed that general corrosion rate of X70 steel decreased with the increase of CO₂ pressure from 4 to 12 MPa at 35 ℃. FeCO₃ film and severe general corrosion was observed at 4 MPa, while thin and discontinuous corrosion product and serious pitting corrosion attack were found under other CO₂ pressure conditions. It is of great corrosion risk to transport CO₂ in gaseous or supercritical status for X70 mild steel if free water is formed in the pipeline.

Key words: gaseous supercritical CO2 corrosion X70 steel

Received: 21 July 2015

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Xiu JIANG,Xiaoliang SONG,Dingrong QU,Xiaohui LIU. Corrosion Behavior of X70 Mild Steel during Transportation of Gaseous- and Supercritical-CO₂ Fluids. Journal of Chinese Society for Corrosion and protection, 2016, 36(3): 225-230.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.120 OR https://www.jcscp.org/EN/Y2016/V36/I3/225

Fig.1 Surface images of the corrosion products (a, c) and metal substrate after film removal (b, d) for X70 steel corroded at 35 ℃ under CO₂ pressures of 4 MPa (a, b) and 6 MPa (c, d)

Fig.2 Variations of general corrosion rate of X70 steel with supercritical CO₂ pressure at 35 ℃

Fig.3 SEM images of corrosion products formed on X70 steel at 35 ℃ under CO₂ pressures of 8 MPa (a, b), 9 MPa (c, d), 10 MPa (e, f) and 12 MPa (g, h)

Fig.4 SEM images and EDX analysis results for X70 steel at 35 ℃under CO₂ pressures of8 MPa (a) and 9 MPa (b)

Fig.5 Surface morphologies of X70 steel after removal of the corrosion products formed at 35 ℃ under CO₂ pressures of 8 MPa (a), 9 MPa (b), 10 MPa (c) and 12 MPa (d)

Fig.6 Variations of general corrosion rate of X70 steel at CO₂ pressure of 4~12 MPa and 35 ℃

Fig.7 Variations of pH value of NaCl solution as a functionof CO₂ pressure at 35 ℃

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