Preparation and Property of Superhydrophobic Phosphate-Cerium Composite Coatings on Hot-dip Galvanizing Carbon Steel

doi:10.11901/1005.3093.2018.173

Chinese Journal of Materials Research

2018, Vol. 32

Issue (11): 801-810 DOI: 10.11901/1005.3093.2018.173

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Preparation and Property of Superhydrophobic Phosphate-Cerium Composite Coatings on Hot-dip Galvanizing Carbon Steel

Tianyu WENG, Delin LAI, Xiaocong LI, Yanbin ZHU, Chunshan CHE, Wenli DENG, Gang KONG(

)

South China University of Technology, Guangzhou 510640, China

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Tianyu WENG, Delin LAI, Xiaocong LI, Yanbin ZHU, Chunshan CHE, Wenli DENG, Gang KONG. Preparation and Property of Superhydrophobic Phosphate-Cerium Composite Coatings on Hot-dip Galvanizing Carbon Steel. Chinese Journal of Materials Research, 2018, 32(11): 801-810.

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Abstract

A superhydrophobic phosphate-cerium salt composite coating was prepared on hot-dip galvanizing carbon steel via a two-step chemical conversion process, namely first traditional phosphating and then dipping in solution of cerium nitrate and stearic acid. The prepared coating was characterized in terms of surface morphology, chemical composition and structure by means of field emission scanning electron microscopy (FE-SEM), energy spectrum analyzer (EDS), fourier transform infrared spectroscopy (FTIR), X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS). The hydrophobicity and corrosion performance of the prepared coating was assessed by means of contact angle- and sliding angle- measurement, as well as electrochemical impedance (EIS) and Tafel polarization curve measurement. Results show that the superhydrophobic coating can effectively reduce the corrosion through the interfacial air film. The contact angle of the coating can reach up to 162°. The coating, prepared by dipping in cerium salt solution for about 300 s, presents an electrochemical impedance two orders of magnitude superior to that of pure Zn, indicating a good corrosion resistance.

Key words: metallic materials superhydrophobic phosphate cerium film corrosion resistance

Received: 01 March 2018

ZTFLH:

TB34

Fund: Supported by National Natural Science Foundation of China (No. 51373055)

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	Tianyu WENG
	Delin LAI
	Xiaocong LI
	Yanbin ZHU
	Chunshan CHE
	Wenli DENG
	Gang KONG

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.173 OR https://www.cjmr.org/EN/Y2018/V32/I11/801

Fig.1 XRD patterns of the chemical conversion coatings on P₃₀₀ and P₃₀₀Ce₃₀₀

Fig.2 High resolution XPS spectrum acquired on the surface of P₃₀₀Ce₃₀₀: (a) Zn 2p; (b) P 2p; (c) Ce3d; (d) O1s

Fig.3 Infrared spectra of Stearic acid, P₃₀₀Ce₃₀₀ and P₃₀₀Ce₃₀₀STA

Fig.4 Dynamic contact angle of P₃₀₀Ce₃₀₀STA: (a) water droplet is above the surface of the sample, (b, c) contact between the water and sample, (d, e) droplet gradually left the surface of the sample. (f) droplet completely leave the surface of the sample

Fig.5 WCA and WSA of P₃₀₀Ce_xSTA

Fig.6 WCA and WSA of P₃₀₀Ce₃₀₀STA for water with different pH values

Fig.7 SEM images of galvanized sheets after phosphated for different time: (a) 10 s, (b, c) 120 s, (d) 300 s, (e, f) 600 s

Fig.8 SEM images of P₃₀₀CexSTA: (a, b) 10 s; (c) 120 s; (d, e) 300 s; (f) 600 s

Table 1 EDS data of different regions in Fig.8 (%, atomic fraction)

Fig.9 EIS plots of the coatings on P₃₀₀CexSTA in 3.5% NaCl solution: (a, b) Bode plots, (c, d) Nyquist plots

Table 2 Electrochemical polarization parameters obtained from polarization curves in Fig.10

Fig.10 Polarization curves of the coatings on P300Ce_xSTA in 3.5% NaCl solution

Fig.11 EIS plots of the coatings on P₃₀₀Ce₃₀₀STA after immersed in 3.5% NaCl solution for different time: (a, b) Bode plots, (c, d) Nyquist plots

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