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Materials 2018, 11(8), 1462; https://doi.org/10.3390/ma11081462

Corrosion Behaviors of Q345R Steel at the Initial Stage in an Oxygen-Containing Aqueous Environment: Experiment and Modeling

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
2
Research Institute of Natural Gas Technology, Southwest Oil and Gas Field Company of PetroChina, Chengdu 610213, China
3
School of Mechanical Engineering, Southwest Petroleum University, Chengdu 610500, China
*
Authors to whom correspondence should be addressed.
Received: 31 May 2018 / Revised: 3 August 2018 / Accepted: 10 August 2018 / Published: 17 August 2018
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Abstract

The ingress of oxygen into pressure vessels used in oil & gas production and transportation could easily result in serious corrosion. In this work, the corrosion behaviors of Q345R steel at the initial stage in 1 wt.% NaCl solution were investigated using electrochemical techniques. The effects of oxygen concentration, temperature and pH on corrosion behaviors were discussed. Simultaneously, a numerical model based on the mixed potential theory was proposed. The results show that the proposed model accords well with the experimental data in the pH range from 9.0 to 5.0. In this pH range, the oxygen reduction reaction, H+ reduction, water reduction, and iron oxidation can be quantitatively analyzed using this model. However, this model shows a disagreement with the experimental data at lower pH. This can be attributed to the fact that actual area of reaction on the electrode is much smaller than the preset area due to the block effect resulted from hydrogen bubbles adsorbed on the electrode surface. View Full-Text
Keywords: oxygen corrosion; low alloy steel; modeling; mixed potential theory oxygen corrosion; low alloy steel; modeling; mixed potential theory
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Chen, L.; Hu, J.; Zhong, X.; Zhang, Q.; Zheng, Y.; Zhang, Z.; Zeng, D. Corrosion Behaviors of Q345R Steel at the Initial Stage in an Oxygen-Containing Aqueous Environment: Experiment and Modeling. Materials 2018, 11, 1462.

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