The Corrosion Behavior of Galvanized Steel in Alkaline Soil

Abstract:

The grounding grid of some substation shows severely corrosion, which affects the safe running of power grid. Galvanized steel is widely used in grounding grid. However, the galvanized steel is easy to corrosion in alkaline soil. In this paper, the corrosion behavior of galvanized steel was studied through accelerated corrosion test of burying specimens in laboratory soils and the corrosion rate was measured by electrochemical test. The corrosion products and corrosion appearance were analyzed by means of SEM, and XRD. The results show that pitting corrosion and localized corrosion were observed on the surface of the galvanized steel, the corrosion products were rough and loose, indicating no protection, the corrosion products of galvanized steel were ZnO,FeO(OH),FeCl₃,Zn₃O(SO₄)₂,and ZnSO₃·2.50H₂O. Electrochemical test show that the corrosion rate of galvanized steel in the later corrosion stage is higher than in the initial corrosion stage.

• Periodical: Applied Mechanics and Materials (Volume 331)
• Pages: 416-420
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.331.416
• Online since: July 2013
• Authors: Feng Jie Yan, Xing Geng Li, Xue Gang Wang
• Keywords: Accelerated Corrosion, Electrochemical, Galvanized Steel, Grounding Grid, Soil Corrosion

References

[1] Feng Lajun, Yan Aijun, Meng Yongqiang, Hou Juanling. Investigation on corrosion of yttrium-doped magnesium-based sacrificial anode in ground grid protection. Journal of Rare Earths, Vol.28, Spec. Issue, Dec. 2010, pp.389-392

DOI: 10.1016/s1002-0721(10)60351-1

[2] Yan Aijun, Chen Yi, Feng Lajun. Soil corrosion performance of several grounding net materials. Corrosion Science and Protection Technology, 2010, 22(3):197

[3] R.H.Lv, J.Chin. Soc. Corros. Prot. 14(1984)134

[4] Wang Qifang. Investigation and evaluation of soil corrosivity. Chemical Corrosion and Protection, 1997, 4: 17-21

[5] Li Sufang, Xie Xuefei, Chen Zongzhang, Peng Minfan, He Liping, YU Dongjiang. Corrosion and Protection of Earth Screen in Transformer Substation. Materials Protection, 2004, 2: 9-11

[6] C. Sun, J. Xu*, F. H. Wang, C. K. Yu. Effect of sulfate reducing bacteria on corrosion of stainless steel 1Cr18Ni9Ti in soils containing chloride ions. Materials Chemistry and Physics, 126(2011)330-336

DOI: 10.1016/j.matchemphys.2010.11.017

[7] Chen Kunhan, Yang Daowu, Zhu Zhiping, Yang Haijun. Corrosion Characteristic of Grounding Grid in Soil .Insulators and Surge Arresters, 2008, 224(4): 39-46

[8] GB 50169-2006 Code for construction and acceptance of grounding connection electric equipment installation engineering [S].

[9] C.W. Du, X G. Li, P. Liang, Z. Y. Liu, G. F. Jia, and Y.F. Cheng. Effects of microstructure on corrosion of X70 pipe steel in an alkaline siol. JMEPEG (Journal of Materials Engineering and Performance). 2009, 18(2):216-220

DOI: 10.1007/s11665-008-9280-y

[10] Wen Jie, Wang Yonghong, Lu Zhonghui. Study on Corrosion behavior of aluminum in neutral and alkaline soil. Modern Cable Transmission, 2001, 1： 6-9