To read the full version of this content please select one of the options below:

Corrosion failure analysis of the galvanized lightning rod in a 220 kV transformer substation

Jiayuan Hu (Zhejiang Electric Power Corporation Research Institute, Hangzhou, China)
Zhixing Fang (Zhejiang Zheneng Energy Saving Technology Co. Ltd., Hangzhou, China)
Zhouhai Qian (Hangzhou Yineng Electric Technology Co. Ltd., Hangzhou, China)
Xiaoming Shen (Zhejiang Electric Power Corporation Research Institute, Hangzhou, China)
Haifei Zhou (Zhejiang Electric Power Corporation Research Institute, Hangzhou, China)
Dongchun Jin (Zhejiang Electric Power Corporation Research Institute, Hangzhou, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 6 November 2017

Downloads
117

Abstract

Purpose

The purpose of this paper is to study the cause of severe corrosion of the galvanized lightning rods in a 220 kV transformer substation, and to seek the effective corrosion inhibition measures for the hollow lightning rods.

Design/methodology/approach

The corrosion morphology and rust component of lightning rod was analyzed, and the corrosion process of lightning rod was researched by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), ion chromatography and electrochemical tests.

Findings

The results indicated that the outer surface of hollow lightning rod was corroded slightly; however, its inner surface suffered severe corrosion because of a long time high-humidity environment inside the tube caused by the rainwater permeation. A rust layer consisted of Fe3O4 and a little FeOOH was accumulated on the inner surface of the hollow lightning rod. Moreover, Fe3O4 rust layer worked as a large cathode area which could promote the corrosion of metal substrate further. A self-accelerating corrosion process was formed on the inner surface, making the corrosion failure of lightning rod occurred and aggravated gradually.

Originality/value

The corrosion of inner surface of hollow lightning rod cannot be detected easily. More attention should be paid to the corrosion inhibition of lightning rod. The key of corrosion inhibition for the hollow lightning rod was to avoid the rainwater accumulation inside tube. The research results can provide guidelines on the corrosion inhibition measures selection of lightning rod in transformer substation.

Keywords

Acknowledgements

The authors are grateful for the financial support from the technology projects of State Grid Zhejiang Electric Power Corporation (5211DS16001N) and Hangzhou Yineng Electric Technology Co., Ltd (EPRD2017-07).

Citation

Hu, J., Fang, Z., Qian, Z., Shen, X., Zhou, H. and Jin, D. (2017), "Corrosion failure analysis of the galvanized lightning rod in a 220 kV transformer substation", Anti-Corrosion Methods and Materials, Vol. 64 No. 6, pp. 620-625. https://doi.org/10.1108/ACMM-03-2017-1776

Publisher

:

Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited