Corrosion Resistance of Silane-Modified Hydroxide Zinc Carbonate Film on AZ31 Magnesium Alloy

doi:10.1007/s40195-015-0208-x

Abstract

Abstract:

The corrosion resistance of magnesium alloys can be improved using functional surface modification such as hydrophobic treatment. In this study, a hierarchical hydroxide zinc carbonate (HZC) film was fabricated on AZ31 magnesium alloy via a simple chemical-bath deposition process using urea aqueous solution. The morphologies, compositions and corrosion resistance of the hydrophobic film were analyzed using scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectrometer, and electrochemical measurements as well. The results revealed that the HZC film displayed flower-like protrusions and had a thickness of approximately 100 μm. The fluoroalkylsilane (FAS)-modified HZC film exhibited a hydrophobic property with a water contact angle of 131.3°. The FAS/HZC film significantly improved the corrosion resistance of the AZ31 alloy due to hierarchical structures and hydrophobic modification.

Key words: Magnesium alloy, Hydrophobicity, Silane, Surface modification, Corrosion

Rong-Chang Zeng, Li-Jun Liu, Ting-Ting Pang, Fen Zhang, Wei-Wei Zhang, Shuo-Qi Li, Hong-Zhi Cui, En-Hou Han. Corrosion Resistance of Silane-Modified Hydroxide Zinc Carbonate Film on AZ31 Magnesium Alloy[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(3): 373-380.

Figures/Tables 9

Fig. 1 SEM images of the HZC a, b and FAS/HZC films c, d

Fig. 2 Elemental mapping images and EDS spectra for the HZC film a and the FAS/HZC film b

Fig. 3 SEM images of the cross-sectional view and the corresponding EDS line scanning analysis for the HZC film a and FAS/HZC film b

Fig. 4 Profiles of water droplets on the AZ31 substrates a, the HZC film b and the FAS/HZC film c

Fig. 5 XRD patterns of the AZ31 substrate a and HZC powder scraped from the deposited film b

Fig. 6 FT-IR spectra of the HZC film a and FAS/HZC film b

Fig. 7 Polarization curves of the AZ31 alloy a, the HZC film b and the FAS/HZC film c in 3.5 wt% NaCl solution

Table 1 Electrochemical parameters of the polarization curves

Sample	E _corr (mV vs. SCE)	I _corr (A/cm²)
AZ31 substrate	-1,540	2.64 × 10^-5
HZC film	-1,261	2.24 × 10^-5
FAS/HZC film	-550	2.61 × 10^-8

Fig. 8 Schematical illustration of the interface between the hydrophobic surface and the 3.5 wt% NaCl solution

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