Effects of Silane-modified Nano ZrO2 on the Corrosion Resistance of Epoxy Coating on the Surface of Mg-Li Alloy†

doi:10.7503/cjcu20160512

Abstract

Abstract:

The epoxy coatings containing ZrO₂ nanoparticles modified with bis-[3-(triethoxysilyl)propyl]tetrasulfide(KH-69 silane) were prepared by coating method on the surface of Mg-Li alloy. The effect of concentration of KH-69 silane-modified ZrO₂ nanoparticles on the corrosion resistance of epoxy coatings was evaluated. The addition of KH-69 silane-modified ZrO₂ nanoparticles can considerably improve the corrosion resistance of the epoxy coating on the surface of Mg-Li alloys. Among them, the epoxy coating containing 1.0% KH-69 silane-modified ZrO₂ nanoparticles exhibits the highest corrosion resistance. After 528 h of immersion in 3.5% NaCl solution, its low frequency impendence valve is about 1.6×10⁹ Ω·cm², which exhibits an increase of about five order of magnitude as compared with the blank epoxy coating.

Key words: Mg-Li alloy, ZrO₂, Silane, Epoxy, Corrosion

CLC Number:

O646

TrendMD:

SONG Dalei, LIU Siqi, LI Feng, WANG Yanli, ZHANG Tao, YAN Yongde, ZHANG Meng, WANG Jun. Effects of Silane-modified Nano ZrO₂ on the Corrosion Resistance of Epoxy Coating on the Surface of Mg-Li Alloy^†[J]. Chem. J. Chinese Universities, 2017, 38(1): 77.

Figures/Tables 10

Scheme 1 Schematic representation of the preparation of the epoxy coating containing KH-69 silane-modified ZrO2 nanoparticles on the Mg-Li alloy

Fig.1 XRD patterns of ZrO2 nanoparticles a. ZrO2 nanoparticles; b. standard card(JCPDS No. 36-0420).

Fig.2 FTIR spectra of KH-69 silane(a), KH-69 silane-modified ZrO2 nanoparticles(b) and ZrO2 nanoparticles(c)

Fig.3 SEM images of top view(A) and cross-section(B) of epoxy coating containing KH-69 silane-modified ZrO2 on Mg-Li alloy

Fig.4 EIS plots of the blank epoxy coating immersed in 3.5% NaCl solution with different immersion time

Fig.5 EIS plots of the epoxy coatings containing 0.5% ZrO2(A, B), 1.0% ZrO2(C, D) and 2.0% ZrO2(E, F) modified with KH-69 silane immersed in 3.5% NaCl solution with different immersion time

Fig.6 Equivalent electrical circuit used to fit the EIS data of the blank epoxy coating and the epoxy coa-tings containing 0.5% ZrO2, 1.0% ZrO2 and 2.0% ZrO2 modified with silane KH-69

Fig.7 Optical photographs of the blank epoxy coating(A, C) and the epoxy coating containing 1.0% KH-69 silane-modified ZrO2 nanoparticles(B, D) immersed in 3.5% NaCl solution at different immersion timeImmersion time/h: (A), (B) 0; (C) 240; (D) 528.

Scheme 2 Schematic illustration of corrosion resistance mechanism of epoxy coating containing KH-69 silane-modified ZrO2 nanoparticles(A) Blank epoxy coating; (B) containing little amount of KH-69 silane modified nanoparticles; (C) containing excess amount of KH-69 silane modified nanoparticles; (D) containing appropriate amount of KH-69 silane modified nanoparticles.

Scheme 3 Chemical reaction between KH-69 silane, ZrO2 and epoxy

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Effects of Silane-modified Nano ZrO₂ on the Corrosion Resistance of Epoxy Coating on the Surface of Mg-Li Alloy^†

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