Atmospheric Corrosion Characteristics and Regularity of the Q235, 40Cr Steels Commonly-used in Power Grid Equipment in Anhui Province

doi:10.11902/1005.4537.2022.201

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (3): 535-543 DOI: 10.11902/1005.4537.2022.201

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Atmospheric Corrosion Characteristics and Regularity of the Q235, 40Cr Steels Commonly-used in Power Grid Equipment in Anhui Province

LI Lemin¹, ZHANG Jie², BIAN Yafei¹, MIAO Chunhui², CHEN Guohong², TANG Wenming¹(

)

^1.School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
^2.Electric Power Research Institute, Anhui Electric Power Co. Ltd., State Grid, Hefei 230601, China

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Abstract

Aimming at the Q235 and 40Cr steel samples exposed in air for 1 and 3 a in typical substations in Anhui province, the products and morphologies of their corrosion layers were investigated, and further the corrosion mechanisms were clarified. The corrosion rate of the steel samples was obtained via the mass-loss method, and then the grey correlation analysis was executed to determine the influences of main environmental factors on atmospheric corrosions of the Q235 and 40Cr steel samples exposed for 1 and 3 a, respectively, through combining with the main environmental factor data of the relevant cities in Anhui province. The results showed that the atmospheric corrosion products of the Q235 and 40Cr steel samples were FeOOH, Fe₃O₄, Fe(OH)₃ and FeSO₄. The corrosion layer is covered by cotton ball-like α-FeOOH and flaky γ-FeOOH. It has a dense structure, but laminar cracking takes place. The atmospheric corrosion grades of the Q235 and 40Cr steels in Anhui province have no significant difference, and both are of C2 and C3. The correlation degree sequence of environmental factors affecting atmospheric corrosion of the Q235 and 40Cr samples exposed for 1 a is: NO₂> temperature >SO₂> relative humidity >O₃. With the exposure time prolonging to 3 a, it is changed to be: SO₂, temperature >NO₂> relative humidity >O₃.

Key words: grid equipment steel atmospheric exposure test atmospheric corrosion corrosion characteristic gray relation analysis

Received: 21 June 2022 32134.14.1005.4537.2022.201

ZTFLH:

TG174

Fund: Science and Technology Research Project of Anhui Electric Power Co. Ltd., State Grid, China(B1120521001U)

Corresponding Authors: TANG Wenming, E-mail: wmtang69@126.com

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	LI Lemin
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	CHEN Guohong
	TANG Wenming

Cite this article:

LI Lemin, ZHANG Jie, BIAN Yafei, MIAO Chunhui, CHEN Guohong, TANG Wenming. Atmospheric Corrosion Characteristics and Regularity of the Q235, 40Cr Steels Commonly-used in Power Grid Equipment in Anhui Province. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 535-543.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.201 OR https://www.jcscp.org/EN/Y2023/V43/I3/535

Table 1 Sampling sites and environmental characteristics of the atmospheric exposure test

Table 2 Air quality data of the relevant cities in Anhui province in the exposure test period

Fig.1 XRD patterns of Q235 (a) and 40Cr (b) steel samples in different sites after exposure in air for 3 a

Fig.2 Planar SEM images of Q235 (a) and 40Cr (b) steel samples in site R1 after exposure in air for 1 a

Fig.3 Planar SEM images (a, b) and EDS spectrum of point 1 in Fig.3b (c) of the Q235 (a) and 40Cr (b) steel samples in site R1 after exposure in air for 3 a

Fig.4 Cross-sectional SEM images (a, b) and EDS spectrum of the square area in Fig.4a (c) of the Q235 (a) and 40Cr (b) steel in site R1 after exposure in air for 3 a

Fig.5 Schematic diagram showing the atmospheric corrosion mechanism of carbon steel

Table 3 Corrosion rates and grades of the Q235 and 40Cr steel samples in the relevant cities of Anhui province

Fig.6 Grey relation coefficient curves of the Q235 (a, b) and 40Cr (c, d) steel samples in the relevant cities of Anhui province after exposure for 1 a (a, c) and 3 a (b, d)

Table 4 Grey relational analyses of the Q235 and 40Cr steel samples after exposure for 1 a and 3 a

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