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Open AccessArticle
Numerical Simulation Study on the Corrosion Behaviour of Q345 Steel in a Simulated Marine Thermocline
by
Jiezhen Hu
Jiezhen Hu 1,2,3,
Junhao Zeng
Junhao Zeng 1,
Wenjuan Liu
Wenjuan Liu 1,
Peichang Deng
Peichang Deng 2,4,*,
Xin Hu
Xin Hu 1 and
Peilin Wang
Peilin Wang 1
1
College of Mechanical Engineering, Guangdong Ocean University, Zhanjiang 524088, China
2
Zhanjiang Key Laboratory of Corrosion and Protection of Ocean Engineering Equipment, Zhanjiang 524088, China
3
Guangdong Provincial Ocean Equipment and Manufacturing Engineering Technology Research Center, Zhanjiang 524088, China
4
College of Chemistry and Environment, Guangdong Ocean University, Zhanjiang 524088, China
*
Author to whom correspondence should be addressed.
Materials 2024, 17(15), 3808; https://doi.org/10.3390/ma17153808 (registering DOI)
Submission received: 28 June 2024
/
Revised: 17 July 2024
/
Accepted: 21 July 2024
/
Published: 1 August 2024
Abstract
Changes in temperature, pH, dissolved oxygen content, and nutrients, which are key factors that cause metal corrosion, are common in marine thermoclines. To study the corrosion behaviours and reveal the corrosion mechanisms of metals in a marine thermocline, COMSOL 6.2 software is used in this paper. With this software, the corrosion behaviour of Q345 steel in a thermocline is numerically simulated, and a simulated marine thermocline is built indoors for experimental research purposes. The corrosion behaviour and mechanism of Q345 steel in a marine thermocline were investigated through numerical simulation, electrochemical testing, and corrosion morphology observation. After 21 days of immersion in the simulated marine thermocline, Q345 steel specimens at different depths are shown to have undergone vertical galvanic corrosion, with two anodes and two cathodes. At depths of 70 m and 150 m, the Q345 steel becomes the anode in the galvanic corrosion reaction, while at depths of 110 m and 190 m, the Q345 steel becomes the cathode in the galvanic corrosion reaction. The cathode is protected by the anode and has a relatively low corrosion rate. The main reason underlying these phenomena is that there are large differences in the dissolved oxygen contents and temperatures at different depths in a thermocline. The different dissolved oxygen contents lead to differences in the oxygen concentrations of Q345 steel specimens at various depths. These variations trigger galvanic coupling corrosion. Moreover, the difference in temperature further aggravates the degree of galvanic corrosion.
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MDPI and ACS Style
Hu, J.; Zeng, J.; Liu, W.; Deng, P.; Hu, X.; Wang, P.
Numerical Simulation Study on the Corrosion Behaviour of Q345 Steel in a Simulated Marine Thermocline. Materials 2024, 17, 3808.
https://doi.org/10.3390/ma17153808
AMA Style
Hu J, Zeng J, Liu W, Deng P, Hu X, Wang P.
Numerical Simulation Study on the Corrosion Behaviour of Q345 Steel in a Simulated Marine Thermocline. Materials. 2024; 17(15):3808.
https://doi.org/10.3390/ma17153808
Chicago/Turabian Style
Hu, Jiezhen, Junhao Zeng, Wenjuan Liu, Peichang Deng, Xin Hu, and Peilin Wang.
2024. "Numerical Simulation Study on the Corrosion Behaviour of Q345 Steel in a Simulated Marine Thermocline" Materials 17, no. 15: 3808.
https://doi.org/10.3390/ma17153808
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