Investigation on Atmospheric Corrosion Behavior of Transmission Tower Materials in Simulated Industrial Environments

doi:10.11902/1005.4537.2017.077

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (5): 460-466 DOI: 10.11902/1005.4537.2017.077

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Investigation on Atmospheric Corrosion Behavior of Transmission Tower Materials in Simulated Industrial Environments

Xiaobo MENG¹,Wubin JIANG²,Yongli LIAO¹,Ruihai LI¹,Zhijun ZHENG²(

),Yan GAO³

1 Electric Power Research Institute, China Southern Power Grid, Guangzhou 510080, China
2 School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China
3 School of Material Science and Engineering, South China University of Technology, Guangzhou 510641, China

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Abstract

The atmosphere corrosion behaviour of transmission tower materials including Q235, Q345 and galvanized steel in simulated industrial environments of spraying NaHSO₃ solutions was investigated by means of mass loss method, XRD analysis and SEM observation. The results indicated that the corrosion degree of Q235 and Q345 was not significantly increased with the increase of NaHSO₃ concentration of the simulated solution below 0.005 mol/L, and that the above two steels presented a trend of accelerated corrosion with the increase of NaHSO₃ concentration in the range between 0.005 and 0.02 mol/L, and that the corrosion degree of Q235 and Q345 had not obvious changes with the increase of NaHSO₃ concentration in the range between 0.02 and 0.03 mol/L. The results of XRD analysis and SEM observation further suggested that the above corrosion phenomena of Q235 and Q345 steel are strongly related to the fact whether the conversion of corrosion product γ-FeOOH to α-FeOOH did occur or not for the media with the amount of NaHSO₃ in every individual concentration range. In addition, the corrosion products on galvanized steel mainly consisted of ZnO, Zn₄CO₃(OH)₆, Zn₅(CO₃)₂(OH)₆ and Zn₄SO₄(OH)₆ despite different concentration of spraying solutions.

Key words: carbon steel galvanized steel simulated industrial environment atmospheric corrosion

Received: 16 May 2017

Fund: Supported by Nation Natural Science Foundation of China (51477072)

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	Xiaobo MENG
	Wubin JIANG
	Yongli LIAO
	Ruihai LI
	Zhijun ZHENG
	Yan GAO

Cite this article:

Xiaobo MENG,Wubin JIANG,Yongli LIAO,Ruihai LI,Zhijun ZHENG,Yan GAO. Investigation on Atmospheric Corrosion Behavior of Transmission Tower Materials in Simulated Industrial Environments. Journal of Chinese Society for Corrosion and protection, 2017, 37(5): 460-466.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.077 OR https://www.jcscp.org/EN/Y2017/V37/I5/460

Table 1 Chemical compositions of Q235 and Q345 steels (mass fraction / %)

Fig.1 Surface macro-morphologies of Q235 (a~e), Q345 (f~j) and galvanized steel (k~o) after accelerated test in 0.001 mol/L (a, f, k), 0.005 mol/L (b, g, l), 0.01 mol/L (c, h, m), 0.02 mol/L (d, i, n) and 0.03 mol/L (e, j, o) NaHSO₃ solutions

Fig.2 Mass losses of Q235, Q345 and galvanized steels versus concentration of NaHSO₃solution

Fig.3 XRD spectra of corrosion products formed on Q235 and Q345 steels after accelerated test for 96 h in 0.001 mol/L (a), 0.005 mol/L (b), 0.01 mol/L (c) and 0.02 mol/L (d) NaHSO₃ solutions

Fig.4 XRD spectra of corrosion products formed on galvanized steel after accelerated test for 96 h in 0.001 mol/L (a) and 0.005 mol/L NaHSO₃ solutions

Fig.5 Surface micro-morphologies of Q235 (a, c, e) and Q345 (b, d, f) steels after accelerated test for 96 h in 0.001 mol/L (a, b), 0.01 mol/L (c, d) and 0.03 mol/L (e, f) NaHSO₃ solutions

Fig.6 Surface micro-morphologies of the galvanized steel after accelerated test for 96 h in 0.001 mol/L (a) and 0.01 mol/L (b) NaHSO₃ solutions

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