Corrosion Behavior of X65 Carbon Steel in CO2Containing Liquids with Constant pH and Ferrous Ion Concentration

doi:10.11902/1005.4537.2017.195

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (6): 573-578 DOI: 10.11902/1005.4537.2017.195

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Corrosion Behavior of X65 Carbon Steel in CO₂Containing Liquids with Constant pH and Ferrous Ion Concentration

Xiankang ZHONG(

),Junying HU

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Oil and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China

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Abstract

The corrosion test of carbon steel in a closed vessel with desired liquids will usually result in obviously changes in pH and ferrous ion concentration. However, in oil and gas field the pH and ferrous ion concentration at any specific location in side a pipeline does not change significantly with time. In this work, ion exchange resin was used to adjust the pH and ferrous ion concentration of the CO₂containing liquids during the corrosion process of X65 steel in a small loop, where the initial pH was 5.80 and initial ferrous ion concentration was 20 mg/L. In this case, the test loop full of CO₂containing liquids with constant pH and constant ferrous ion concentration was developed. Then, the corrosion of X65 steel in such an environment was investigated by open circuit potential, linear polarization resistance and surface analysis techniques. As a comparison, the corrosion of X65 carbon steel in liquid with inconstant pH and ferrous ion concentration (no adjustment for the pH and ferrous ion concentration during the corrosion) was also studied. The results showed that under the inconstant condition, the corrosion rate of X65 sharply decreased after 120 h. The corrosion rate was about 0.5 mm/a after 220 h. The corrosion product composed of very compact ferrous carbonate. However, under the condition of constant pH and ferrous ion concentration, the corrosion rate of X65 did not start to slowly decrease until 160 h; while the corrosion rate was still as high as 4.5 mm/a after 220 h. Many cracks in the corrosion products layer and obvious gaps between the substrate and corrosion product layer could also be found. Therefore, it is essential to maintain a relatively constant pH and ferrous ion concentration in a closed vessel of CO₂containing liquid when one tries to reproduce the CO₂corrosion behavior of carbon steel as that emerged in oil and gas field.

Key words: corrosion carbon steel ion exchange pH value ferrous ion

Received: 20 November 2017

ZTFLH:

TG174.1

Fund: 国家自然科学基金(51601159);Applied and Fundamental Research of Sichuan Province(2017JY0171)

Corresponding Authors: Xiankang ZHONG E-mail: zhongxk@swpu.edu.cn

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Xiankang ZHONG,Junying HU. Corrosion Behavior of X65 Carbon Steel in CO₂Containing Liquids with Constant pH and Ferrous Ion Concentration. Journal of Chinese Society for Corrosion and protection, 2018, 38(6): 573-578.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2017.195 OR https://www.jcscp.org/EN/Y2018/V38/I6/573

Fig.1 Schematic setup for pH and ferrous ion concen-tration control system: (1) stainless steel tubing, (2) column for ion exchange, (3) pump, (4) pH controller, (5) gas inlet, (6) pH probe, (7) flask, (8) counter electrode, (9) X65 steel sample, (10) refer-ence electrode, (11) gas outlet, (12) column for ion exchange, (13) pump, (14) timer

Fig.2 pH values as a function of time during the corrosion of X65 in 1%NaCl solution with and without hydro-gen form resin at 80 ℃ (the initial sulution: 20 mg/L Fe²⁺, pH=5.80 and

P C O 2

=0.537×10⁵Pa)

Fig.3 Fe²⁺concentration as a function of time during the corrosion of X65 in 1%NaCl solution with and with-out sodium form resin at 80 ℃ (the initial solution: 20 mg/L Fe²⁺, pH=5.80,

P C O 2

=0.537×10⁵Pa)

Fig.4 SEM section images of the corrosion products formed on X65 steel in 1%NaCl solution at 80 ℃for 220 h under two different conditions of constant (a) and non-constant (b) pH and ferrous ion concentration (the initial solution: 20 mg/L Fe²⁺, pH=5.80,

P C O 2

=0.537×10⁵Pa)

Fig.5 Corrosion potential as a function of corrosion time for X65 steel in 1%NaCl solution with constant and non-constant pH and ferrous ion concentration at 80 ℃ (the initial solution： 20 mg/L Fe²⁺, pH=5.80,

P C O 2

=0.537×10⁵Pa)

Fig.6 Corrosion ratevstime curves of X65 steel during the corrosion in 1%NaCl solution with constant and non-constant pH and ferrous ion concentration at 80 ℃ (the initial solution: 20 mg/L Fe²⁺, pH=5.80,

P C O 2

=0.537×10⁵Pa)

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