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

Author

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

Subjects
Microscopy, Materials science, Article Subject, Carbon steel, Scanning electron microscope, 020209 energy, QH201-278.5, Metallurgy, 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, Rust, Environment of China, Atomic and Molecular Physics, and Optics, Corrosion, 0202 electrical engineering, electronic engineering, information engineering, engineering, Fourier transform infrared spectroscopy, 0210 nano-technology, Spectroscopy, Instrumentation, Layer (electronics), Research Article
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.

Published
2020

4. NiSx nanoparticles with S/N-doped carbon layer as advanced anode for Li/Na storage.

Author

Luo, Zhicong, Wang, Xin, Chen, Zhi, Xiang, Tong, Feng, Shanzhi, Wang, Fangqiang, Feng, Zhijun, Li, Xibao, Zhang, Bangyan, and Huang, Juntong

Abstract

Although NiSx has a high storage advantage in ion battery as the anode material, the shortcomings such as poor conductivity and volume expansion seriously affect the performance. In this work, NiSx nanoparticles with an S/N-doped carbon layer (NiSx@S/N–C) are prepared by a simple hydrothermal reaction combined with heat treatment. At 2 A g−1, the discharge-specific capacity of the NiSx@S/N–C electrode can achieve at 609 mAh g−1 at the 400th cycle for lithium-ion batteries. Meanwhile, it shows the 270 mAh g−1 discharge capacity in the initial cycle and obtains a high specific capacity of 232 mAh g−1 after 250 cycles at 0.5 A g−1 for Na storage. In this research, a simple and reliable method is adopted to improve the capacity and performance of transition metal sulfide. [ABSTRACT FROM AUTHOR]

Published
2022
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7. Effects of aging on the structural, mechanical, and thermal properties of the silicone rubber current transformer insulation bushing for a 500 kV substation

Author

Zhang Xinghai, Zhou Yiqian, Wang Fangqiang, Lan Xinsheng, and Zhigao Wang

Subjects
Thermogravimetric analysis, Materials science, Polymers, Characterization, 02 engineering and technology, Silicone rubber, 01 natural sciences, law.invention, chemistry.chemical_compound, law, 0103 physical sciences, Thermal stability, Composite material, External insulation, 010302 applied physics, chemistry.chemical_classification, Multidisciplinary, Research, Polymer, 021001 nanoscience & nanotechnology, Current transformer, Aging analysis, Cracking, chemistry, Bushing, 0210 nano-technology, Alternating current
Abstract

In order to analyze the cracking and aging reason of the silicone rubber current transformer (CT) insulation bushing used for 8 years from a 500 kV alternating current substation, characteristics including Fourier transform infrared (FTIR) spectroscopy, mechanical properties analysis, hardness, and thermo gravimetric analysis have been carried out. The FTIR results indicated that the external surface of the silicone rubber CT insulation bushing suffered from more serious aging than the internal part, fracture of side chain Si–C bond was much more than the backbone. Mechanical properties and thermal stability results illustrated that the main aging reasons were the breakage of side chain Si–C bond and the excessive cross-linking reaction of the backbone. This study can provide valuable basis for evaluating degradation mechanism and aging state of the silicone rubber insulation bushing in electric power field.

Published
2016

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