Corrosion Behavior of Galvanized Steel in Simulated Ocean Atmosphere

doi:10.11902/1005.4537.2014.081

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (2): 151-155 DOI: 10.11902/1005.4537.2014.081

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Corrosion Behavior of Galvanized Steel in Simulated Ocean Atmosphere

ZHONG Xizhou¹, WANG Zhenyao¹(

), LIU Yanjie¹, WANG Binbin¹, BAI Fang², DOU Zhihong²

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Shenyang Rustproof Packaging Material Co. Ltd., Shenyang 110033, China

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Abstract

A alternate salt-spray/dry accelerated corrosion facility was set up to simulate the corrosive ocean atmosphere and then with which the corrosion behavior of galvanized steel was studied by means of electrochemical measurement, XRD, SEM and EDAX analysis. The results show that the corrosion resistance of galvanized steel varied with the progress of corrosion process, which declined firstly at the beginning stage, then ascended in the intermediary stage and declined again in the final stage. Correspondingly a yellow rust composed mainly of α-FeOOH appeared firstly, which induced positive effect on the corrosion resistance of galvanized steel, later corrosion products γ-FeOOH and β-FeOOH successively appeared, which induced negative effect on the corrosion resistance of galvanized steel.

Key words: galvanized steel atmospheric corrosion corrosion behavior salt-spray/dry accelerated test

Received: 11 June 2014

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	Xizhou ZHONG
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	Zhihong DOU

Cite this article:

ZHONG Xizhou, WANG Zhenyao, LIU Yanjie, WANG Binbin, BAI Fang, DOU Zhihong. Corrosion Behavior of Galvanized Steel in Simulated Ocean Atmosphere. Journal of Chinese Society for Corrosion and protection, 2015, 35(2): 151-155.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2014.081 OR https://www.jcscp.org/EN/Y2015/V35/I2/151

Fig.1 Images of galvanized steel after corroded for 24 h (a), 48 h (b), 96 h (c), 192 h (d) and 240 h (e)

Fig.2 Polarization curves of galvanized steel after corroded for different time

Fig.3 Nyquist diagrams of galvanized steel after corroded for different time (a) and the magnified image of square area in Fig.3a (b)

Fig.4 Equivalent circuit diagram of galvanized steel after corroded for 24, 48 and 240 h

Fig.5 Equivalent circuit diagram of galvanized steel after corroded for 96 and 192 h

Table 1 Fitting parameters of EIS of galvanized steel after corroded for 24, 48, 9, 192 and 240 h

Fig.6 Resistances of inner rust layer in the function of time

Fig.7 Cross sections and corresponding EDAX line scannings of galvanized steel after corroded for 24 h (a), 48 h (b), 96 h (c), 192 h (d) and 240 h (e)

Fig.8 XRD spectra of corrosion products of galvanized steel corroded for various time

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