Corrosion and Wear Corrosion Behavior of FH40 Marine Steel in Simulated Polar Seawater Environment

doi:10.11902/1005.4537.2024.234

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (4): 859-868 DOI: 10.11902/1005.4537.2024.234

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Corrosion and Wear Corrosion Behavior of FH40 Marine Steel in Simulated Polar Seawater Environment

HUANG Shiyu¹, LIU Shichen¹, YANG Songpu¹, LIU Jiabing¹, LI Gang², GUO Na¹, LIU Tao¹(

)

1 College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
2 China Aero Poly-technology Establishment, Beijing 100028, China

Cite this article:

HUANG Shiyu, LIU Shichen, YANG Songpu, LIU Jiabing, LI Gang, GUO Na, LIU Tao. Corrosion and Wear Corrosion Behavior of FH40 Marine Steel in Simulated Polar Seawater Environment. Journal of Chinese Society for Corrosion and protection, 2025, 45(4): 859-868.

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Abstract

In order to clarify the performance of marine steel in real service conditions of polar ice seawater with microorganisms at low temperature, herein, the corrosion and wear corrosion behavior of a F-class marine steel FH40 at low temperatures in simulated polar seawater solution, which is a mixture of artificial seawater with Psychrophilic cibarius containing 2216E culture medium was studied via immersion test, electrochemical measurement and reciprocating friction and wear test. The results showed that FH40 steel consisted primarily of ferrite and a small amount of pearlite, with minor common inclusions containing Al, Ti, and Si. The corrosion rate of the steel in the simulated polar seawater was (0.238 ± 0.005) mm/a. Corrosion products composed of γ-FeOOH, α-FeOOH, Fe₂O₃/Fe₃O₄, and a microbial biofilm of Psychrophilic cibarius. These loose and porous corrosion product film, along with localized coverage of polar microorganisms, synergistically induced the formation of pits. The friction coefficient of steel in simulated polar seawater was 0.41 with a specific wear rate of 4.1 × 10^-5 g/(N·m·s) and a wear volume of 0.019 mm³. The mechanism related with the wear-corrosion was identified as a hybrid model involving mechanical removal and corrosion removal. In addition, friction exacerbated localized corrosion and compromised the corrosion protection of the rust layer, while the post continued corrosion of the worn steels helped alleviate pitting corrosion in the wear scar area and reduced the width of the wear scar.

Key words: polar ship steel polar microorganism microbiological influenced corrosion corrosion products wear corrosion

Received: 30 July 2024 32134.14.1005.4537.2024.234

ZTFLH:

TG172

Fund: China Postdoctoral Science Foundation(2023M742213);Postdoctoral Fellowship Program (Grade C) of China Postdoctoral Science Foundation(GZC20231538);Technology Basic Research Project of State Administration of Science, Technology and Industry for National Defense of China(JSHS2022206A001)

Corresponding Authors: LIU Tao, E-mail: liutao@shmtu.edu.cn

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	HUANG Shiyu
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	LIU Jiabing
	LI Gang
	GUO Na
	LIU Tao

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.234 OR https://www.jcscp.org/EN/Y2025/V45/I4/859

Fig.1 Microstructure and EDS results of FH40 steel

Table 1 Mass losses and corrosion rates of three FH40 steel samples immersed in simulated polar seawater at 4 ℃ for 30 d

Fig.2 Macroscopic morphology of FH40 steel after immersion in simulated polar seawater at 4 ℃ for 30 d

Fig.3 General and partial enlarged views of the surface (a) and cross section (b) of FH40 steel after immersion in simulated polar seawater at 4 ℃ for 30 d, and corresponding EDS analysis results

Fig.4 XRD pattern of FH40 steel immersed in simulated polar seawater at 4 ℃ for 30 d

Fig.5 Optical profiles of FH40 steel after removing corrosion products formed during immersion in simulated polar seawater at 4 ℃ for 30 d: (a1-c1) three-dimensional profile, (a2-c2) profile curve along the white dashed line in Fig.5a1-c1

Fig.6 Electrochemical results of FH40 steel immersed in simulated polar seawater at 4 ℃ for 0 and 7 d: (a) open circuit potentials, (b) polarization curves, (c) Bode diagrams, (d) Nyquist plots

Sample	R_s / Ω·cm²	CPE_f / Ω·cm^-2·s $- n 1$	n₁	R_f / Ω·cm²	CPE_dl / Ω·cm^-2·s $- n 2$	n₂	R_ct / Ω·cm²	χ²
0 d R(QR)	7.9				5.7 × 10^-4	0.76	1670.0	4.8 × 10^-4
7 d R(QR)(QR)	12.11	3.6 × 10^-3	0.80	431.9	2.1 × 10^-3	0.67	211.3	1.7 × 10^-4

Table 2 Fitting results of EIS of FH40 steel immersed in simulated polar seawater at 4 ℃ for 0 and 7 d

Fig.7 Variations of friction coefficients of three FH40 steel samples in simulating polar seawater with time

Table 3 Mass losses and wear rates per unit distance of three FH40 steel samples in simulated polar seawater

Fig.8 Surface analysis results and compositions of the wear zone and scratch zone of FH40 steel after friction in simulated polar seawater environment: (a) overall morphology, (b, c) wear zone morphologies and element mappings, (d, e) scratch zone morphologies and element mappings

Fig.9 Optical profiles of FH40 steel after removing corrosion products formed during friction in simulated polar seawater environment: (a1-c1) two-dimensional profile, (a2-c2) profile curve along the white line in Fig.9a1-c1, (a3-c3) three-dimensional profile

Fig.10 Overall surface morphologies of FH40 steel after removing corrosion products formed during friction in simulated polar seawater environment (a) and enlarged views of the wear zone (b) and scratch zone (c)

Fig.11 Overall surface morphologies and compositions of the wear zone and scratch zone of worn sample after immersing in simulated polar seawater environment for 30 d (a), wear zone morphologies and element mappings (b, c), scratch zone morphologies and element mappings (d, e)

Fig.12 Optical profiles of the worn sample after removing the corrosion products formed during immersion in simulated polar seawater environment for 30 d: (a1-c1) two-dimensional profile, (a2-c2) profile curve along the white line in Fig.12a1-c1, (a3-c3) three-dimensional profile

Fig.13 Surface morphologies of the worn sample after removing the corrosion products formed during immersion in simulated polar seawater environment for 30 d: (a) overall morphology, (b) morphology of the wear zone, (c) morphology of the scratch zone

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