Atmospheric Corrosion of Carbon Steel and Galvanized Steel in a Test Site at Dujiangyan City

doi:10.11902/1005.4537.2014.178

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (3): 271-278 DOI: 10.11902/1005.4537.2014.178

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Atmospheric Corrosion of Carbon Steel and Galvanized Steel in a Test Site at Dujiangyan City

Xianguang ZENG^1,³(

),Xingwen ZHENG^2,³,Min GONG^1,³,Jinlong FAN¹,Xuedan CHEN^1,³

1. School of Materials Science and Chemistry Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
2. School of Chemical and Pharmaceutical Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
3. Key Laboratory of Material Corrosion and Protection of Sichuan Province, Sichuan University of Science & Engineering, Zigong 643000, China

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Abstract

The atmospheric corrosion behavior of carbon steel and galvanized steel was investigated by exposure for one and three years respectively at four test spots with different local-environmental conditions in a test site at Dujiangyan city of Sichuan province, and then the corrosion morphology, corrosion rate and corrosion products of the two steels were carefully examined. The results showed that due to the significant differences in local temperature and relative humidity the corrosion rates of the two steels were different at the four test spots. In general, the corrosion rates of the two steels reduced with the increasing corrosion time. Zn coating could effectively protect the steel substrate, i.e. suppress the environmental corrosion in the test spots. The relative humidity, time of wetness and the fluctuation of relative humidity were important affecting factors on the corrosion of the steels.

Key words: atmospheric corrosion local environment carbon steel galvanized steel

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	Xianguang ZENG
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	Xuedan CHEN

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Xianguang ZENG,Xingwen ZHENG,Min GONG,Jinlong FAN,Xuedan CHEN. Atmospheric Corrosion of Carbon Steel and Galvanized Steel in a Test Site at Dujiangyan City. Journal of Chinese Society for Corrosion and protection, 2015, 35(3): 271-278.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.178 OR https://www.jcscp.org/EN/Y2015/V35/I3/271

Table 1 Chemical compositions of carbon steel and galvanized coating

Fig.1 Monthly rainfall of Dujiangyan city in the experimental period

Fig.2 Curves of temperature and relative humidity vs time at monitoring points A (a), B (b), C (c) and D (d)

Table 2 Statistics of temperature and relative humidity at three monitoring points in the period of 2011.7~2012.7

Fig.3 Surface morphologies of the samples after corrosion for 1 a (a) and 3 a (b)

Fig.4 Metallurgical micrographs of the samples test for 3 a

Fig.5 Corrosion rates of different material samples at different monitoring points

Table 3 Corrosion rate of test samples

Fig.6 Protection efficiency of zinc coating at different monitoring points

Table 4 Estimation of atmospheric corrosion rating based on the corrosion rate of carbon steel and zinc coating

Fig.7 SEM image (a) and EDS result (b) of galvanized steel sample exposed for 3 a at monitoring point D

Fig.8 SEM image (a) and EDS result (b) of corrosion products of carbon steel sample exposed for 3 a at monitoring point D

Fig.9 XRD pattern of the corrosion products of carbon steel sample exposed for 3 a at monitoring point D

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