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Journal of Chinese Society for Corrosion and protection  2025, Vol. 45 Issue (6): 1659-1668    DOI: 10.11902/1005.4537.2025.042
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Failure Behavior of Fine-grained FH40 Marine Low-temperature Steel in Conditions of Coupling Effect of Seawater-sea Ice
SUN Shibin1, GAO Hao1, CHANG Xueting2(), WANG Dongsheng2()
1 School of Logistics Engineering, Shanghai Maritime University, Shanghai 201306, China
2 School of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
Cite this article: 

SUN Shibin, GAO Hao, CHANG Xueting, WANG Dongsheng. Failure Behavior of Fine-grained FH40 Marine Low-temperature Steel in Conditions of Coupling Effect of Seawater-sea Ice. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1659-1668.

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Abstract  

During the voyage of polar ships, the coating of the ship's hull may peel off due to the erosive action of sea ice, thereby leading to the coupled effect of sea ice friction and seawater corrosion. Herein, the performance of FH40 polar marine low-temperature steel with two different microstructures in conditions of artificial sear-water corrosion, sea-ice wear and friction, as well as the coupling effect of sea-water corrosion and sea-ice friction at different temperatures was assessed via a simulation set, electrochemical techniques, in terms of the microstructure and the variation of wear trace characteristics for the test steels, as well as light interferometer and scanning electron microscope, in terms of the microstructure and wear trace characteristics of the test steels The results indicate that as the grain size of steel increases, there are significant changes in the friction coefficient and corrosion rate by the same test conditions, namely increasing from 0.28 to 0.35 for friction in air at 20 oC; from 0.23 to 0.25 for friction in artificial seawater at 20 oC; from 0.38 to 0.43 for friction in air at 0 oC; and from 0.29 to 0.32 for friction in artificial seawater at 0 oC; The corrosion rate increased from 3.11 × 10-3 to 3.86 × 10-3 mm/a in artificial seawater at 20 oC; However for immersion in artificial seawater at 0 oC the corrosion rate of the steel of fine grains is 2.11 × 10-3 mm/a, while that of coarser rise to 2.76 × 10-3 mm/a. This may be ascribed to that fine grains can result in higher hardness of the steel, increase the resistance to dislocation movement and plastic deformation, thus make the steel stronger wear- and corrosion-resistance. During friction test while free corrosion in artificial seawater of the steel, it was found that with the progress of corrosion process the cross-sectional width of wear marks increased, the wear amount increased, and the corrosion potential shifted to the negative direction. The calculated wear increment WC caused by corrosion and the corrosion increment CW caused by wear were both positive, providing favorable evidence for the coupling and mutual promotion of friction and corrosion.

Key words:  FH40 marine low-temperature steel      seawater corrosion      friction and wear      electrochemical friction     
Received:  10 February 2025      32134.14.1005.4537.2025.042
ZTFLH:  TG172  
Fund: National Key Research and Development Program(2022YFB3705303);Technical Standard Project of Shanghai Science and Technology Commission(21DZ2205700);"Dawn" Plan of Shanghai Munici- pal Education Commission(19SG46);Project of Shanghai Deep Sea Material Engineering Techno-logy Center(19DZ2253100)
Corresponding Authors:  CHANG Xueting, E-mail: xtchang@shmtu.edu.cnWANG Dongsheng, E-mail: wangds@shmtu.edu.cn

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2025.042     OR     https://www.jcscp.org/EN/Y2025/V45/I6/1659

Fig.1  Metallographic microstructures of A1(a) and A2 (b) steel samples
SampleMass before experiment / gMass after experiment / gMass loss / gCorrosion rate / mm·a-1
A1 (20 oC)1.16781.15800.00983.86 × 10-3
1.17541.16620.00923.62 × 10-3
1.15491.14450.01044.10 × 10-3
A2 (20 oC)1.17251.16460.00793.11 × 10-3
1.15691.14940.00752.95 × 10-3
1.15941.15100.00843.30 × 10-3
A1 (0 oC)1.15501.14800.00702.76 × 10-3
1.17331.16570.00762.99 × 10-3
1.15621.15010.00612.40 × 10-3
A2 (0 oC)1.15781.15270.00512.11 × 10-3
1.17431.16880.00552.16 × 10-3
1.16251.15770.00481.89 × 10-3
Table 1  Mass losses and corrosion rates of A1 and A2 after 1200 h immersion in simulated seawater at different temperatures
Fig.2  Friction coefficient vs. time curves (a) and average friction coefficients (b) of A1 and A2 during friction in air at 0 oC and 20 oC
Fig.3  Friction coefficient vs. time curves (a) and average friction coefficients (b) of A1 and A2 during friction in seawater medium at 0 oC and 20 oC
Fig.4  Open circuit potentials of A1 and A2 before, during and after friction under the condition of no applied protective potential
Fig.5  Friction coefficient vs. time curves (a) and average friction coefficients (b) of A1 and A2 under the conditions of una-pplied and applied protective potential
Fig.6  Potentiodynamic polarization curves of A1 and A2 under the conditions of unapplied and applied protective potential
ParametersEcorr, SCE / VIcorr / μA·cm-2ba / mV·dec-1bc / mV·dec-1Crate / mm·a-1
-0.4 VA11.92 × 10-34.07 × 10-3-254.28173.954.28 × 10-3
A21.95 × 10-33.15 × 10-3-265.33226.803.42 × 10-3
OCPA12.01 × 10-37.19 × 10-3-200.15265.176.22 × 10-3
A22.08 × 10-36.35 × 10-3-215.52270.215.29 × 10-3
Table 2  Fitting parameters of polarization curves of A1 and A2 in Fig.6
Fig.7  3D morphologies of wear tracks of A1 and A2 after friction tests with (a, b) and without (c, d) cathodic protection
Fig.8  Cross-sectional profiles of wear tracks of A1 and A2 after friction tests with and without cathodic protection
Fig.9  SEM images of wear tracks of A1 and A2 after friction tests with (a, b) and without (c, d) protective potential
SampleT / cm3W0 / cm3C0 / cm3WC / cm3CW / cm3W / cm3C / cm3S / cm3
A11.84 × 10-61.16 × 10-60.23 × 10-60.33 × 10-60.12 × 10-61.49 × 10-60.35 × 10-60.45 × 10-6
A21.58 × 10-61.03 × 10-60.18 × 10-60.27 × 10-60.10 × 10-61.30 × 10-60.28 × 10-60.37 × 10-6
Table 3  Volume losses of A1 and A2 after friction test in simulated seawater
Fig.10  Friction-corrosion coupling factor for A1 and A2 samples of FH40 steel
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