Corrosion Behavior in Soil of Xinjiang of Steels for Photovoltaic Pile Foundation

doi:10.11902/1005.4537.2023.280

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (4): 987-992 DOI: 10.11902/1005.4537.2023.280

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Corrosion Behavior in Soil of Xinjiang of Steels for Photovoltaic Pile Foundation

WANG Gang¹, LI Zhao¹, WANG Tao², DUAN Teng², DU Cuiwei²(

)

1. TBEA Xinjiang SUNOASIS Co., Ltd., Urumqi 830011, China
2. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

Cite this article:

WANG Gang, LI Zhao, WANG Tao, DUAN Teng, DU Cuiwei. Corrosion Behavior in Soil of Xinjiang of Steels for Photovoltaic Pile Foundation. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 987-992.

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Abstract

Three kinds of steel used for photovoltaic pile foundation were buried in a selected site in Xinjiang area for 30 d, whilst the accelerated soil acceleration test was carried out in the laboratory for comparison in terms of their corrosion behavior. Then their corrosion morphology and corrosion products were characterized by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), and the corrosion behavior of different photovoltaic pile steels in Xinjiang soil environment were compared by electrochemical tests. The results show that compared with the other two corrosion-resistant steels, the Q355B carbon steel suffers from the most serious corrosion. The corrosion products are mainly iron compounds composed of α-FeOOH and γ-FeOOH. The three steels exhibit the same corrosion acceleration ratio in the accelerated corrosion tests with the same parameters, and their corrosion mechanism is basically the same as that of the real field corrosion test.

Key words: Q355B carbon steel corrosion-resistant steel soil corrosion accelerated corrosion experiment photovoltaic pile

Received: 08 September 2023 32134.14.1005.4537.2023.280

ZTFLH:

TG172.4

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

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.280 OR https://www.jcscp.org/EN/Y2024/V44/I4/987

Table 1 Chemical compositions of Q355B carbon steel, corrosion-resistant steel A and corrosion-resistant steel B

Fig.1 Potentiodynamic polarization curves of three kinds of photovoltaic steel for pile foundation in field soil (a) and comparison of E_corr and E_b values (b)

Fig.2 Macroscopic corrosion morphologies of three kinds of photovoltaic pile steel after 30 d of field soil corrosion (a-c) and 10 d of accelerated corrosion test (d-f): (a, d) Q355B carbon steel, (b, e) corrosion-resistant steel A, (c, f) corrosion-resistant steel B

Fig.3 Morphologies of corrosion products of three kinds of photovoltaic pile steel after 30 d of field soil corrosion: (a, d) Q355B carbon steel, (b, e) corrosion-resistant steel A, (c, f) corrosion-resistant steel B

Fig.4 EDS results of corrosion products of three kinds of photovoltaic pile steel after 30 d of field soil corrosion: (a) Q355B carbon steel, (b) corrosion-resistant steel A, (c) corrosion-resistant steel B

Fig.5 XRD patterns of the corrosion products of three kinds of photovoltaic pile steel after 30 d of field soil corrosion (a) and 10 d of accelerated corrosion test (b)

Fig.6 Corrosion rates of three kinds of photovoltaic steel for pile foundation under the conditions of field soil corrosion and accelerated corrosion tests (a) and local enlarged diagram of Fig.6a (b)

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