Effect of Size of Silica Powder on Preparation of Silicate Conversion Coatings on Galvanized Steel

doi:10.11901/1005.3093.2013.940

Chinese Journal of Materials Research

2014, Vol. 28

Issue (6): 462-468 DOI: 10.11901/1005.3093.2013.940

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Effect of Size of Silica Powder on Preparation of Silicate Conversion Coatings on Galvanized Steel

Gang KONG¹,Shuanghong ZHANG^1,^**(

),Ziwen SUN²,Chunshan CHE¹,Jintang LU¹

1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640
2. Guangdong Institute of Metrology, Guangzhou 510405

Cite this article:

Gang KONG,Shuanghong ZHANG,Ziwen SUN,Chunshan CHE,Jintang LU. Effect of Size of Silica Powder on Preparation of Silicate Conversion Coatings on Galvanized Steel. Chinese Journal of Materials Research, 2014, 28(6): 462-468.

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Abstract

Sodium silicate solutions of SiO₂: Na₂O molar ratio 3.50 were prepared with 5 mass fraction % of micro- and nano-SiO₂ respectively, and then silicate conversion coatings were obtained by immersing hot-dip galvanized (HDG) steel sheets in the solutions. The SiO₂ powders were characterized by X-ray diffraction (XRD) and reflectance absorption infrared spectroscopy (RA-IR), the sodium silicate solutions were characterized by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance spectroscopy (²⁹Si NMR), and the silicate conversion coatings were characterized by atomic force microscope (AFM) and electrochemical impedance spectroscopy (EIS). The results show that there exist more Si-OH bonds in nano-SiO₂ rather than that in micro-SiO₂; the degree of polymerization of the silicate ions in sodium silicate solution with nano-SiO₂ is lower, therefore, the amount of dehydration generated in the coating formation process is higher, as a consequence, the formed silicate conversion coating possesses higher porosity.

Key words: inorganic non-metallic materials silicate conversion coating hot-dip galvanizing sodium silicate silica

Received: 11 December 2013

Fund: *Supported by the International lead and Zinc Study Group NO. ILZRO/IZA/CN201212, and the Guangdong Provincial Research Project of the Ministry of Education NO. 2012B091100312, and the Fundamental Research Funds for the Central Universities.

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	Gang KONG
	Shuanghong ZHANG
	Ziwen SUN
	Chunshan CHE
	Jintang LU

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.940 OR https://www.cjmr.org/EN/Y2014/V28/I6/462

Fig.1 XRD spectrum of the MS and NS powder

Fig.2 RA-IR spectra of the MS and NS powder

Fig.3 SEM image of the MS powder (a) and TEM image of the NS powder (b)

Fig.4 FT-IR spectra of MS and NS silicate solutions

Fig.5 Schematic illustration of 5 typical Si-O lingkages in sodium silicate solutions

Fig.6 29SiNMR spectrum of MS and NS silicate solution

Fig.7 Relative percentage of Si-O linkage types of silicate solutions

Fig.8 Analysis graphics of waviness of the MS (a) and NS (b) silicate coating

Fig.9 Bode diagrams and the fitted curve of all samples (a, b) and equivalent circuit for all samples (c)

Table 1 Values of the elements related to HDG and the two silicate coatings, determined from the fit to the mode of Fig.9c

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