Corrosion Behavior of Domestic Galvanized Steel in Different Water Environment: Fresh Water and Salt Water

doi:10.11902/1005.4537.2021.003

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (2): 169-177 DOI: 10.11902/1005.4537.2021.003

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Corrosion Behavior of Domestic Galvanized Steel in Different Water Environment: Fresh Water and Salt Water

CAO Jingyi¹, FANG Zhigang¹, LI Liang¹, FENG Yafei¹, WANG Xingqi², SHOU Haiming³, YANG Yange²(

), CHU Guangzhe¹, YIN Wenchang¹

^1.Unit 92228, People's Liberation Army, Beijing 100072, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Unit 92942, People's Liberation Army, Beijing 100161, China

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Abstract

Corrosion behavior of domestic galvanized steel in salt water and fresh water was investigated by means of electrochemical impedance spectroscopy and electrochemical noise. The results indicated that corrosion process of galvanized steel can be divided into three different stages both in salt water and fresh water, and distinguished electrochemical characteristic in each stage can be observed. Corrosion rate of the galvanized steel in salt water was obviously higher than that in fresh water. The formed corrosion products are rod-like or lamellar on the surface of galvanized steel after immersion in salt water, but less protectiveness for the substrate. Whereas, the formed corrosion products are compact film composed of sphere-like particulates on the surface of galvanized steel after immersion in fresh water, which can effectively protect the substrate from further corrosion.

Key words: galvanized steel water environment electrochemical impedance spectroscopy electrochemical noise

Received: 05 January 2021

ZTFLH:

TG174

Corresponding Authors: YANG Yange E-mail: ygyang@imr.ac.cn

About author: YANG Yange, E-mail: ygyang@imr.ac.cn

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	Jingyi CAO
	Zhigang FANG
	Liang LI
	Yafei FENG
	Xingqi WANG
	Haiming SHOU
	Yange YANG
	Guangzhe CHU
	Wenchang YIN

Cite this article:

CAO Jingyi, FANG Zhigang, LI Liang, FENG Yafei, WANG Xingqi, SHOU Haiming, YANG Yange, CHU Guangzhe, YIN Wenchang. Corrosion Behavior of Domestic Galvanized Steel in Different Water Environment: Fresh Water and Salt Water. Journal of Chinese Society for Corrosion and protection, 2021, 41(2): 169-177.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.003 OR https://www.jcscp.org/EN/Y2021/V41/I2/169

Fig.1 Microstructure of the cross-section of the domestic galvanized steel

Fig.2 Evolution of the OCP of the domestic galvanized steel with immersion time

Fig.3 Nyquist (a, d, g), modules (b, e, h) and phase angle (c, f, h) plots of the domestic galvanized steel in salt water during the immersion of 0~144 h (a~c), 144~600 h (d~f) and 600~720 h (g, h)

Fig.4 Nyquist (a, d, g), modules (b, e, h) and phase angle (c, f, h) plots of the domestic galvanized steel in fresh water during the immersion 0~144 h (a~c), 144~336 h (d~f) and 336~720 h (g~i)

Fig.5 Low-frequency modules of the domestic galvanized steel in two kinds of water with immersion time: (a) salt water, (b) fresh water

Fig.6 Raw electrochemical noise date (a, c, e, g) and current noise after DC-drift (b, d, f, h) of the domestic galvanized steel in salt water during the immersion of 4 h (a, b), 48 h (c, d), 240 h (e, f) and 600 h (g, h)

Fig.7 Hilbert-Huang spectra of current noise of the domestic galvanized steel in salt water during the immersion of 4 h (a), 48 h (b), 240 h (c) and 600 h (d)

Fig.8 Raw electrochemical noise date (a, c, e, g) and current noise after DC-drift (b, d, f, h) of the domestic galvanized steel in salt water during the immersion of 4 h (a, b), 48 h (c, d), 240 h (e, f) and 600 h (g, h)

Fig.9 Hilbert-Huang spectra of current noise of the domestic galvanized steel in salt water during the immersion of 4 h (a), 48 h (b), 240 h (c) and 600 h (d)

Fig.10 Morphologies of the domestic galvanized steel after 720 h immersion: salt water (a), fresh water (b)

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