Silicon-Zirconium Composite Conversion Film on ADC12 Aluminum Alloy

doi:10.11902/1005.4537.2022.272

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (4): 903-910 DOI: 10.11902/1005.4537.2022.272

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Silicon-Zirconium Composite Conversion Film on ADC12 Aluminum Alloy

DING Li, ZOU Wenjie, ZHANG Xuejiao, CHEN Jun(

)

School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan 243002, China

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Abstract

A new type of Si-Zr composite conversion film was prepared on the surface of ADC12 aluminum alloy by chemical conversion method. The content of aminobissilane was optimized based on the results of copper sulfate dropping test and polarization curve measurement. The microstructure, chemical composition and crystallographic structure of the conversion film were characterized by means of field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR). The corrosion resistance of the passive film was studied by electrochemical test and neutral salt spray test. The results show that the introduction of aminobissilane can significantly improve the uniformity and compactness of the conversion film; thus aminobissilane greatly improves the corrosion resistance of conversion films; among others, the corrosion resistance of the conversion film with 60% aminobissilane is the best. Compared with the Zr conversion film, the capacitive reactance radius and the low frequency impedance value of the Si-Zr composite conversion film increase by more than 3 times respectively, and in consequence, the life-time of salt spray corrosion resistance increases by more than 20 times.

Key words: ADC12 aluminum alloy aminobissilane silicon-zirconium composite conversion film corrosion resistance salt spray test

Received: 05 September 2022 32134.14.1005.4537.2022.272

ZTFLH:

TG174.4

Fund: National Natural Science Foundation of China(U1460106)

Corresponding Authors: CHEN Jun, E-mail: junchen@ahut.edu.cn

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Cite this article:

DING Li, ZOU Wenjie, ZHANG Xuejiao, CHEN Jun. Silicon-Zirconium Composite Conversion Film on ADC12 Aluminum Alloy. Journal of Chinese Society for Corrosion and protection, 2023, 43(4): 903-910.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.272 OR https://www.jcscp.org/EN/Y2023/V43/I4/903

Fig.1 Polarization curves of blank and ZrCC samples

Table 1 Polarization curve data of blank and ZrCC samples

Fig.2 FT-IR spectrum of conversion films

Fig.3 FESEM of zirconium conversion film (a, b) and silicon-zirconium composite conversion film (c-e) and EDS mappings of silicon-zirconium composite conversion film (f)

Table 2 Percentage of elements in different conversion films

Fig.4 XPS spectra of Zr conversion film: (a) survey, (b) Zr 3d, (c), F 1s, (d) Al 2p

Fig.5 XPS spectra of Si-Zr composite conversion film: (a) survey, (b) Al 2p, (c) Zr 3d, (d) Si 2p, (e) O 1s, (f) F 1s

Fig.6 Nyquist (a) and Bode (b, c) plots of blank, Zr film and Si-Zr film

Fig.7 Equivalent circuits for fitting impedance diagrams of blank (a), Zr and Si-Zr conversion films (b)

Table 3 Fitting results of EIS of blank, Zr film and Si-Zr film

Fig.8 Photos of aluminum alloy substrate (a1-a3), Zr conversion film (b1-b3) and Si-Zr composite conversion film (c1-c3) after salt spray experiment

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