Atmospheric Corrosion Analysis and Rust Evolution Research of Q235 Carbon Steel at Different Exposure Stages in Chengdu Atmospheric Environment of China

Zhigao Wang,Mei Wang,Jie Jiang,Fangqiang Wang,Zhi Geng,Xinsheng Lan,Qianqian Tian

doi:10.1155/2020/9591516

Zhigao Wang, Mei Wang + Show 5 more

Open Access

https://doi.org/10.1155/2020/9591516

Copy DOI

Abstract

In order to effectively reduce and retard corrosion of the power transmission and transformation equipment in Chengdu power grid and to improve power supply reliability, Q235 carbon steel material which is the most widely used metal material in power grid was selected as the targeted research object in this article. Exposure experiments were performed in urban atmospheric environment of Chengdu city in the southwest region of China. The corrosion behavior of Q235 carbon steel material was investigated at different seasons. The macro- and micromorphologies after corrosion were observed using a digital camera and scanning electron microscopy (SEM), respectively. Element distribution of the rust layer and the corrosion products was characterized by energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR); the corrosion mechanism was also briefly analyzed.

Highlights

In recent decades, with the construction scale of China’s power transmission and transformation project becoming larger and larger, the corrosion problem of power transmission and transformation equipment is increasingly prominent, which has seriously affected safe operation of the power grid system [1,2,3,4,5,6,7]
On the basis of rainy, high-humidity, and high-acidic pollution characteristics of the atmospheric corrosion environment in Chengdu, the corrosion behavior and regularity of Q235 carbon steel material which has been widely used in power transmission and transformation projects were evaluated after long-term exposure to ambient air
The composition of the rust layer was analyzed by Fourier transform infrared spectroscopy (FTIR) on a Nicolet 6700 FTIR spectrophotometer (Nicolet, USA) between 4000 and 500 cm−1 with a resolution of 2 cm−1

Summary

Introduction

With the construction scale of China’s power transmission and transformation project becoming larger and larger, the corrosion problem of power transmission and transformation equipment is increasingly prominent, which has seriously affected safe operation of the power grid system [1,2,3,4,5,6,7]. The air environment in Chengdu has been seriously polluted in recent years; the major pollutants include SO2, NO2, O3, CO, PM10, and PM2.5 [12] Both the climatic and environmental factors will accelerate the corrosion rate of the metal materials. It is essential to investigate the corrosion behavior of the metal materials in Chengdu atmospheric environment, which is very important to guarantee safe operation of the power transmission and transformation equipment in Chengdu power grid. On the basis of rainy, high-humidity, and high-acidic pollution characteristics of the atmospheric corrosion environment in Chengdu, the corrosion behavior and regularity of Q235 carbon steel material which has been widely used in power transmission and transformation projects were evaluated after long-term exposure to ambient air. The findings obtained in this study will be helpful to develop targeted corrosion protection strategy for urban atmospheric environment in Chengdu, for the purpose of effectively controlling corrosion and ensuring safe and stable operation of Chengdu power grid

Materials and Methods

Results and Discussion

Conclusions