Development and Performance of Phosphate-based Protective Insulation Coating for Non-oriented Electrical Steel

doi:10.11902/1005.4537.2021.250

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (5): 805-812 DOI: 10.11902/1005.4537.2021.250

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Development and Performance of Phosphate-based Protective Insulation Coating for Non-oriented Electrical Steel

HU Xiongxin¹, ZHANG Xian¹(

), LIU Jing¹, WU Kaiming¹(

), LIN An²

^1.Hubei Province Key Laboratory of Systems Science in Metallurgical Process, Collaborative Innovation Center for Advanced Steels, The State Key Laboratory of Refractory Material and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
^2.School of Resource and Environmental Science, Wuhan University, Wuhan 430072, China

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Abstract

A protective insulation coating for non-oriented electrical steel plate was developed with phosphate-based film forming agent, rare earth passivator and silane coupling agent as raw material. The microstructure, composition, electrochemical performance and resistance to salt spray testing of the coatings with different additives were characterized and assessed. The results show that adding rare earth passivator to the film forming agent can effectively fill the pores on the surface of coating. While the addition of silane coupling agent may be beneficial to the dispersive distribution the rare earth salt precipitates, thereby, resulting in a more uniform surface without obvious defects of the composite coating. The electrochemical test results show that the composite coating presents lower corrosion current density and larger polarization resistance. Taking the salt spray test results into consideration, it is evident that the composite coating has excellent corrosion resistance. In addition, the properties of the composite coating, such as interlayer resistance, adhesion, and pencil hardness are all higher than the requirements of the relevant industrial standards.

Key words: electrical steel phosphate coating rare earth silane corrosion resistance

Received: 22 September 2021

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51601138);National Natural Science Foundation of China(51601137)

Corresponding Authors: ZHANG Xian,WU Kaiming E-mail: xianzhang@wust.edu.cn;wukaiming@wust.edu.cn

About author: WU Kaiming, E-mail: wukaiming@wust.edu.cn
ZHANG Xian, E-mail: xianzhang@wust.edu.cn

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	Xiongxin HU
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Cite this article:

HU Xiongxin, ZHANG Xian, LIU Jing, WU Kaiming, LIN An. Development and Performance of Phosphate-based Protective Insulation Coating for Non-oriented Electrical Steel. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 805-812.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.250 OR https://www.jcscp.org/EN/Y2022/V42/I5/805

Fig.1 SEM images of (a, b) A, (c, d) B, (e, f) C and (g, h) D coating samples

Fig.2 SEM images (a) and EDS maps (b-d) of the cross section of the coating sample

Fig.3 Raman spectra of four coating samples

Fig.4 XPS spectra of four coating samples: A (a, e), B (b, f), C (c, g), D (d, h)

Fig.5 Potentiodynamic polarization plots of the bare steel and four coating samples

Table 1 Corrosion current density and corrosion potential of the bare steel and four coating samples

Fig.6 Nyquist and Bode plots of four coating samples: A (a~c), B (d~f), C (g~i), D (j~l)

Fig.7 Equivalent circuit for fitting EIS: (a) sample A for 1, 2 and 4 h, (b) sample B, sample C for 1, 2, 4 and 6 h, sample D for 1, 2, 4, 6 and 12 h

Fig.8 Evolution of the fitted R_p of four coating samples over immersion time

Fig.9 Images of bare steel (a) and A (b), B (c), C (d), D (e) and four coating samples in the neutral salt-spray test for 8 h

Table 2 Comprehensive performance test of D sample

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