Corrosion Behavior in Artificial Seawater of Subzero Treated EH40 Marine Steel Suitable for ExtremelyCold Environments

doi:10.11902/1005.4537.2019.010

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (2): 151-158 DOI: 10.11902/1005.4537.2019.010

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Corrosion Behavior in Artificial Seawater of Subzero Treated EH40 Marine Steel Suitable for ExtremelyCold Environments

SHEN Shuyang¹, WANG Dongsheng¹, SUN Shibin², YANG Ti², ZHAO Qianjing², WANG Xin², ZHANG Yafei², CHANG Xueting¹(

)

1 College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
2 College of Logistics Engineering, Shanghai Maritime University, Shanghai 201306, China

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Abstract

The corrosion behavior in artificial seawater of a marine steel plate suitable for extremely cold environments, EH40 steel before and after subzero treatment was studied by means of immersion test, electrochemical polarization curve measurement, electrochemical impedance spectroscopy, X-ray diffractometer and scanning electron microscope. Results showed that uniform corrosion occurred on the steel before subzero treatment, leading to the formation of a dense corrosion product scale on the steel surface. Whereas, pitting corrosion emerged on the steel subjected to subzero treatment at -80 ℃. The mass loss and corrosion current density of the steel before subzero treatment were 1.15 mm/a and 1.244 μA·cm^-2, respectively, which increased to 1.33 mm/a and 3.643 μA·cm^-2 for the steel after subzero treatment, indicating that the subzero treatment could reduce the corrosion resistance of the steel. The corrosion products for the steels before and after subzero treatment were composed of α-FeOOH, β-FeOOH, and γ-FeOOH. Therefore, low ambient temperature has certain degree of negative impact on the corrosion resistance of marine steel plate in extremely cold environments.

Key words: low temperature ship steel corrosion behavior cooling treatment immersion test electrochemistry test

Received: 12 January 2019

ZTFLH:

TB304

Fund: National Key R&D Program of China(2016YFB0300700);Education and Scientific Research Project of Shanghai(19SG46);Natural Science Foundation of Shanghai(17ZR1440900);International Science and Technology Cooperation Program(CU03-29)

Corresponding Authors: CHANG Xueting E-mail: xtchang@shmtu.edu.cn

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	Shuyang SHEN
	Dongsheng WANG
	Shibin SUN
	Ti YANG
	Qianjing ZHAO
	Xin WANG
	Yafei ZHANG
	Xueting CHANG

Cite this article:

SHEN Shuyang, WANG Dongsheng, SUN Shibin, YANG Ti, ZHAO Qianjing, WANG Xin, ZHANG Yafei, CHANG Xueting. Corrosion Behavior in Artificial Seawater of Subzero Treated EH40 Marine Steel Suitable for ExtremelyCold Environments. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 151-158.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.010 OR https://www.jcscp.org/EN/Y2020/V40/I2/151

Fig.1 Microstructure of EH40 steel

Fig.2 Grain size distribution of low temperature ship steel EH40

Fig.3 Micro morphologies of low temperature ship steel EH40 without (a, b) and with (c, d) -80 ℃ cooling treatment after 72 h immersion (a, c) and then removal of corrosion products (b, d)

Fig.4 SEM images (a, c) and EDS analysis results of arears I (b) and II (d) of corrosion products of EH40 specimens without (a, b) and with (c, d) -80 ℃ cooling treatment after 72 h immersion

Fig.5 XRD patterns of blank EH40 steel and immersed EH40 steel without and with -80 ℃ cooling treatment

Fig.6 Corrosion morphology of EH40 steel with -80 ℃ cooling treatment after immersion

Fig.7 Polarization curves of EH40 steel without and with -80 ℃ cooling treatment after 72 h immersion

Table 1 Fitting results of the polarization curves of EH40 steel without and with -80 ℃ cooling treatment after 72 h immersion

Fig.8 Nyquist plot (a), equivalent circuit (b), phase angle (c) and impedance module (d) plots for EH40 steel without and with -80 ℃ cooling treatment after 72 h immersion

Table 2 Fitting results of equivalent circuit

Fig.9 Local electrochemical impedance spectroscopies of EH40 steel samples without (a) and with (b) -80 ℃ cooling treatment

Fig.10 Corrosion mechanisms of EH40 steel without (a) and with (b) -80 ℃ cooling treatment after corrosion for 72 h

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