Initial Corrosion Behavior of Galvanized Steel in Atmosphere by Qinghai Salt Lake

doi:10.11901/1005.3093.2017.452

Chinese Journal of Materials Research

2018, Vol. 32

Issue (4): 255-262 DOI: 10.11901/1005.3093.2017.452

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Initial Corrosion Behavior of Galvanized Steel in Atmosphere by Qinghai Salt Lake

Dan ZHANG^1,², Zhenyao WANG¹(

), Yongzhang ZHOU², Yuwei LIU¹, Qi YIN¹, Gongwang CAO¹

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 Nanjing Tech University, Nanjing 211816, China

Cite this article:

Dan ZHANG, Zhenyao WANG, Yongzhang ZHOU, Yuwei LIU, Qi YIN, Gongwang CAO. Initial Corrosion Behavior of Galvanized Steel in Atmosphere by Qinghai Salt Lake. Chinese Journal of Materials Research, 2018, 32(4): 255-262.

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Abstract

The corrosion behavior of galvanized steel in the atmosphere by Qinghai Salt Lake at Northwest China was studied by means of weightlessness analysis, scanning electron microscopy (SEM), X-ray diffractometer (XRD) and electrochemical analysis. The results showed that the corrosion weight loss of galvanized steel in the atmosphere by the Salt Lake was comparatively large, and the corrosion rate increased firstly and then tended to be stable. Corrosion products were mainly composed of Zn₅(OH)₈Cl₂·H₂O, Zn₅(CO)₃(OH)₆ and Zn₄SO₄(OH)₆·3H₂O,as well as lots of dust. The protective effectiveness for the substrate of the corrosion product layer decreased for a while and then tended to be stabilized during the corrosion process. The dust with high chloride salt greatly affected the corrosion process.

Key words: materials failure and protection Qinghai salt lake galvanized steel atmospheric corrosion corrosion product electrochemical technique

Received: 27 July 2017

Fund: Supported by National Natural Science Foundation of China (Nos. 5161197 & 5160119)

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	Dan ZHANG
	Zhenyao WANG
	Yongzhang ZHOU
	Yuwei LIU
	Qi YIN
	Gongwang CAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.452 OR https://www.cjmr.org/EN/Y2018/V32/I4/255

Fig.1 Mass loss and corrosion rate of galvanized steel during exposure for different time

Fig.2 XRD patterns of galvanized steel after exposure for 6 (a), 12 and 24 months (b)

Fig.3 Macro appearances of galvanized steel after exposure for 6 (a), 12 (b) and 24 months (c)

Fig.4 SEM image of galvanized steel after exposure for 6 (a), 12 (b) and 24 months (c)

Fig.5 Cross section morphologies of corrosion product layer of galvanized steel after exposure for 6 (a), 12 (b) and 24 months (c)

Table 1 EDS results of elements at different positions shown in Fig.5

Fig.6 EIS of galvanized steel corroded for different exposure time (a) Nyquist, (b) Bode

Fig.7 Equivalent circuit of EIS of galvanized steel

Table 2 Fitted EIS parameters of galvanized steel

Fig.8 EIS parameters of R_r、R_t and R_p as function of exposure time

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