Preparation and Protective Properties of Inorganic-organic Hybrid Silane-coatings on Mg-alloy AZ31

doi:10.11902/1005.4537.2017.058

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (5): 435-443 DOI: 10.11902/1005.4537.2017.058

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Preparation and Protective Properties of Inorganic-organic Hybrid Silane-coatings on Mg-alloy AZ31

Xinfang ZHANG,Xiaotong OU,Lei LIU,Jinglei LEI,Lingjie LI(

)

School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China

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Abstract

The hybrid silane sol was prepared by adding silane coupling agent in the hydrolyzing tetraethyl orthosilicate (TEOS), and then the organic-inorganic hybrid silane-coating was successfully prepared on the AZ31 Mg-alloy using a simple dip-coating method. The morphology and composition of the hybrid coating were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), energy dispersion spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR). Moreover, the corrosion resistance of the hybrid silane-coating was studied by means of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results showed that the Mg-alloy substrate was completely covered with organic-inorganic hybrid silane-coating, which was uniform and compact. The resistance of the hybrid silane-coating (1.717×10⁴ Ωcm²) is higher than that of the conventional chromate conversion coating (1.611×10⁴ Ωcm²), and correspondingly, the corrosion current density of the AZ31 alloy with coating is about 2 orders of magnitude lower than that of the bare alloy. The steric effect of the silane coupling agent can effectively adjust the traditional hydrolysis polycondensation process of TEOS and prevent the hybrid silane sol from further clustering. The as-prepared coating is compact and uniform, which can resist the corrosive medium and provide excellent protection for Mg-alloy.

Key words: magnesium alloy hybrid silane-coating corrosion resistance formation mechanism

Received: 20 April 2017

Fund: Supported by National Natural Science Foundation of China (21373281, 21573028), Project for Distinguished Young Scholars in Chongqing (cstc2014jcyjjq100004) and Fundamental Research Funds for the Central Universities (106112016CDJZR225515)

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Cite this article:

Xinfang ZHANG,Xiaotong OU,Lei LIU,Jinglei LEI,Lingjie LI. Preparation and Protective Properties of Inorganic-organic Hybrid Silane-coatings on Mg-alloy AZ31. Journal of Chinese Society for Corrosion and protection, 2017, 37(5): 435-443.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.058 OR https://www.jcscp.org/EN/Y2017/V37/I5/435

Fig.1 SEM micrographs (a, b) and elemental EDS mapping images (c, d) of the surface of as-prepared hybrid silane coating, and AFM surface micrograph (e)

Fig.2 Survey spectrum (a) and high-resolution spectra of F 1s (b), O 1s (c), Si 2p (d) and C 1s (e) of hybrid silane coating

Fig.3 FT-IR spectrum of hybrid silane coating

Fig.4 Polarization curves of three kinds of samples in 0.005 mol/L NaCl solution

Table 1 Electrochemical parameters derived from polarization curves shown in Fig.4

Fig.5 Nyquist diagrams of different samples in 0.005 mol/L NaCl solution (a), equivalent circuits used for fitting EIS experimental data of the blank sample (b) and the coating samples (c)

Table 2 Fitting parameters of EIS for different samples in 0.005 mol/L NaCl solution

Fig.6 Nyquist diagrams of magnesium alloy treated with hybrid silane coating after immersion in 0.005 mol/L NaCl solution for 6 h (a) and corresponding equivalent circuit used for fitting EIS experimental data (b)

Table 3 Electrochemical parameters derived from Nyquist diagrams shown in Fig.6

Fig.7 Digital photos of blank (a, d, g, j), CCC (b, e, h, k) and HC (c, f, i, l) samples after immersed in 0.005 mol/L NaCl solution for 0 d (a~c), 1 d (d~f), 3 d (g~i) and 7 d (j~l)

Fig.8 Optical micrographs of blank (a, d, g, j), CCC (b, e, h, k) and HC (c, f, i, l) samples after immersed in 0.005 mol/L NaCl solution for 0 d (a~c), 1 d (d~f), 3 d (g~i) and 7 d (j~l)

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