Initial Corrosion Behavior of Carbon Steel and High Strength Steel in South China Sea Atmosphere

doi:10.11902/1005.4537.2023.031

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (1): 237-245 DOI: 10.11902/1005.4537.2023.031

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Initial Corrosion Behavior of Carbon Steel and High Strength Steel in South China Sea Atmosphere

WANG Jingyu¹, ZHOU Xuejie¹^,²(

), WANG Honglun³, WU Jun¹^,², CHEN Hao¹^,², ZHENG Penghua¹^,²

^1.Wuhan Research Institute of Materials Protection, Wuhan 430030, China
^2.Wuhan Materials Corrosion National Obserbation and Research Station, Wuhan 430030, China
^3.Key Laboratory of Space Launching Site Reliability Technology, Haikou 571126, China

Cite this article:

WANG Jingyu, ZHOU Xuejie, WANG Honglun, WU Jun, CHEN Hao, ZHENG Penghua. Initial Corrosion Behavior of Carbon Steel and High Strength Steel in South China Sea Atmosphere. Journal of Chinese Society for Corrosion and protection, 2024, 44(1): 237-245.

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Abstract

The corrosion performance of carbon steel and three kinds of high-strength steels is comparatively assessed via outdoor exposure in marine atmosphere of the South China Sea in a test site at Wenchang area of Hainan Province, which provides data support and theoretical basis for the development of steels resistant to atmospheric corrosion in the South China Sea. Four kinds of steel, Q235B, Q350EWR1, Q355 and Q345NQR2, were selected as the testing materials. Outdoor corrosion tests were carried out for half a year and one year respectively, and the tested steels was characterized by means of mass loss measurement, metallographic observation and electrochemical analysis. Serious uniform corrosion occurred on the surface of the four steels. Based on the analysis results, the corrosion resistance of the four kinds of steels in the marine atmosphere of the South China Sea is ranked as the following sequence: Q355 > Q345NQR2 > Q235B > Q350EWR1.

Key words: South China Sea marine atmospheric environment atmospheric corrosion test high strength steel electrochemical test

Received: 13 February 2023 32134.14.1005.4537.2023.031

ZTFLH:

TG174

Fund: Science & Technology Fundamental Resources Investigation Program(2021FY100600)

Corresponding Authors: ZHOU Xuejie, E-mail: zhouxj11@163.com

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	WANG Jingyu
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	CHEN Hao
	ZHENG Penghua

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.031 OR https://www.jcscp.org/EN/Y2024/V44/I1/237

Table 1 Main components of four kinds of steels

Fig.1 Original macroscopic corrosion morphologies of Q235B (a, e), Q350EWR1 (b, f), Q355 (c, g) and Q345NQR2 (d, h) steels exposed to atmospheric environment of the South China Sea for 0.5 a (a-d) and 1 a (e-h)

Fig.2 Macro corrosion morphologies of Q235B (a, e), Q350EWR1 (b, f), Q355 (c, g) and Q345NQR2 (d, h) steels exposed to atmospheric environment of the South China Sea for 0.5 a (a-d) and 1 a (e-h) after removing rust

Fig.3 Corrosion morphologies of Q235B (a1-a4), Q350EWR1 (b1-b4), Q355 (c1-c4) and Q345NQR2 (d1-d4) steels exposed to atmospheric environment of the South China Sea for 0.5 a (a1-d1, a2-d2) and 1 a (a3-d3, a4-d4) before (a1-d1, a3-d3)and after (a2-d2, a4-d4) removing rust

Fig.4 Comparison of mean corrosion rates of carbon steel and three high-strength steels after 0.5 and 1 a corrosion

Fig.5 XRD pattern of corrosion products of four kinds of steel after corrosion test in marine atmosphere of the South China Sea

Fig.6 Polarization curves of four kinds of steel after 0.5 a (a) and 1 a (b) corrosion in the marine atmosphere of the South China Sea

Fig.7 Nyquist (a1, a2), impedance module (b1, b2) and phase angle (c1, c2) plots of four kinds of steels after 0.5 a (a1-c1) and 1 a (a2-c2) corrosion in the marine atmosphere of the South China Sea

Table 2 Electrochemical fitting results of four kinds of steels after 0.5 and 1 a corrosion

Fig.8 Equivalent circuit diagram of EIS of four kinds of steels after corrosion in marine atmosphere of the South China Sea

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