Galvanic Corrosion Behavior for Coupling of Three Low Alloy Steels in Artificial Seawater at Low Temperatures

doi:10.11902/1005.4537.2021.353

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (6): 894-902 DOI: 10.11902/1005.4537.2021.353

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Galvanic Corrosion Behavior for Coupling of Three Low Alloy Steels in Artificial Seawater at Low Temperatures

WANG Yuxin¹, WU Bo¹(

), DAI Leyang¹, HU Kefeng², WU Jianhua¹, YANG Yang¹, YAN Fulei¹, ZHANG Xianhui¹

1. Xiamen Key Laboratory of Marine Corrosion and Intelligent Protection Materials, Jimei University, Xiamen 361021, China
2. Wuhan Second Ship Design Institute, Wuhan 430064, China

Cite this article:

WANG Yuxin, WU Bo, DAI Leyang, HU Kefeng, WU Jianhua, YANG Yang, YAN Fulei, ZHANG Xianhui. Galvanic Corrosion Behavior for Coupling of Three Low Alloy Steels in Artificial Seawater at Low Temperatures. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 894-902.

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Abstract

The galvanic corrosion behavior of a coupling of 907A steel, 921A steel and 980 steel, in artificial seawater at different temperatures within the range of 0-20 ℃ was assessed by electrochemical method, mass loss method and morphology observation techniques. The results showed that at different temperatures, 907A steel acted as anode in the coupling, while 921A steel and 980 steel acted as cathode. The galvanic corrosion coefficient of 907A steel increased with the increasing temperature. Besides, galvanic corrosion may emerge to certain extent, for galvanic pairs of metals with close open circuit potential (<60 mV). The galvanic corrosion effect changed the uniform corrosion of 907A steel into local pitting corrosion, which might increase the failure risk of marine facility. For the control of such corrosion, the combination of protective coating and cathodic protection may be a better option.

Key words: marine environment low temperature low alloy high strength steel galvanic corrosion

Received: 08 December 2021

ZTFLH:

TG172

Fund: National Key R&D Program of China(2020YFE0100100)

About author: WU Bo, E-mail: wubo@jmu.edu.cn

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	Articles by authors
	Yuxin WANG
	Bo WU
	Leyang DAI
	Kefeng HU
	Jianhua WU
	Yang YANG
	Fulei YAN
	Xianhui ZHANG

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.353 OR https://www.jcscp.org/EN/Y2022/V42/I6/894

Table 1 Chemical compositions of three low-alloy steels (mass fraction / %)

Fig.1 Top view of spatial arrangement of three working electr-odes (a) and electrochemical measurement cell (b)

Fig.2 Polarization curves of three low alloy steels at 20 ^oC in simulated artificial seawater containing 5 mg/L dissolved oxygen

Table 2 Fitting results of polarization curves of three low alloy steels in simulated artificial seawater

Fig.3 Open circuit potentials (a) and corrosion current densities (b) of three low-alloy steels as functions of temperature

Fig.4 Electric potentials (a) and electric currents (b) of triple metal couple at 0 °C

Fig.5 Electric potentials (a) and electric currents (b) of triple metal couple as functions of temperature

Fig.6 Electrochemical impedance spectra of 907A (a, b), 921A (c, d) and 980 (e, f) low alloy steels before and after coupling

Fig.7 Equivalent circuit model used for EIS fitting analysis

Table 3 Fitting results of EIS of three low-alloy steels at different temperatures

Fig.8 R_ct and R_oxidevs. temperature curves for 907A steel before and after coupling

Fig.9 Mass losses of uncoupled and coupled three low alloy steels after corrosion at different temperatures

Fig.10 Variations of K_C and P_C with temperature

Fig.11 Protection degrees of 921A steel and 980 steel as functions of temperature

Fig.12 SEM images of three low-alloy steels without corrosion products after soaking in artificial seawater at 10 ℃ for 7 d: (a) uncoupled 907A, (b) uncoupled 921A, (c) uncoupled 980, (d) coupled 907A, (e) coupled 921A, (f) coupled 980

Fig.13 Pit morphologies (a) and pit depth measurement chart (b) of 907A steel

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