Corrosion Behavior of Q235 Steels in Atmosphere at Deyang District for one Year

doi:10.11902/1005.4537.2020.180

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (6): 871-876 DOI: 10.11902/1005.4537.2020.180

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Corrosion Behavior of Q235 Steels in Atmosphere at Deyang District for one Year

WANG Zhigao¹, HAI Chao², JIANG Jie³, LAN Xinsheng¹, DU Cuiwei²(

), LI Xiaogang²

^1.State Grid Sichuan Electric Power Research Institute, Chengdu 610041, China
^2.Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
^3.School of Mechanical and Electrical Engineering, Chengdu University of Technology, Chengdu 610059, China

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Abstract

The atmospheric corrosion behavior of carbon steel, the main material of power transmission and transformation equipment, was studied via fled exposure in atmospheres of three different transformer substations situated at Deyang district for one year, as well as weight loss measurement, macroscopic morphology observation, SEM analysis, corrosion product analysis and electrochemical test. The results show that the average corrosion rates of carbon steel are 13.8, 23.47, and 40.18 μm/a, corresponding to the three test sites respectively. The corrosion products of carbon steel exposed in the three test sites are mainly composed of α-FeOOH, γ-FeOOH and Fe₃O₄, among others, the proportion of α-FeOOH is higher in the rust layer on the steel exposed in one test site，where the atmosphere is severely corrosive. The electrochemical results show that the more serious the corrosion of carbon steel is, the higher the corrosion current density and the R_ct are, which indicates that the rust layer formed on the surface of carbon steel can effectively protect the steel and slow down the further corrosion of the steel substrate.

Key words: power transmission and transformation equipments carbon steel atmospheric corrosion

Received: 29 September 2020

ZTFLH:

TG174

Fund: Fundamental Research Funds for Central Universities(FRF-MP-18-002);Science and Technology Project of State Grid Sichuan Electric Power Corporation of China(521997160013)

Corresponding Authors: DU Cuiwei E-mail: dcw@ustb.edu.cn

About author: DU Cuiwei, E-mail: dcw@ustb.edu.cn

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Cite this article:

WANG Zhigao, HAI Chao, JIANG Jie, LAN Xinsheng, DU Cuiwei, LI Xiaogang. Corrosion Behavior of Q235 Steels in Atmosphere at Deyang District for one Year. Journal of Chinese Society for Corrosion and protection, 2021, 41(6): 871-876.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.180 OR https://www.jcscp.org/EN/Y2021/V41/I6/871

Fig.1 Macro morphologies of Q235 steels after exposure in substation A substation (a), B substation (b) and C substation (c) for 1 a

Fig.2 Micro morphologies and EDS results (a1~c1) and section morphologies (a2~c2) of the corrosion products of Q235 steel after exposure in A substation (a), B substation (b) and C substation (c) for 1 a

Fig.3 XRD patterns of the corrosion products of Q235 steel after exposure in different substations of for 1 a

Fig.4 Corrosion pit distributions of the corrosion products of Q235 steel after exposure in A substation (a), B substation (b) and C substation (c) for 1 a

Fig.5 Corrosion pit depth of Q235 steel after exposure in different substations for 1 a

Fig.6 Polarization curve of Q235 steel after exposure in different substations of Deyang city for 1 a

Fig.7 Nyquist (a), Bode (b) plots and equivalent circuit (c) of Q235 steel after exposure in different substations for 1 a

Table 1 Electrochemical fitting results of Q235 steel after exposure in different substations for 1 a

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