Incorporation of Montmorillonite/Silica Composite for the Corrosion Protection of an Epoxy Coating on a 2024 Aluminum Alloy Substrate
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참고문헌
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초록
Layered silicate clay montmorillonite (MMT) has been used in nanocomposite coating to improve corrosionprotection by reinforcing the barrier property. The better dispersion of MMT in the coating produces ahigher barrier effect. Pretreatment with MMT could favor the delamination of clay platelets, facilitatingMMT dispersion in the coating. In the present work, a montmorillonite/silica (MMT/Si) composite wasprepared by the in situ sol-gel method. x-ray diffraction measurements and field-emission scanning electronmicroscopy observations showed silica crystal formation and increased basal spacing between theMMT platelets. Composite MMT/Si particles were introduced in an epoxy resin to reinforce the corrosionprotection of the coating applied on the AA2024 surface. Electrochemical impedance spectroscopy (EIS)was performed to characterize the protective property of the coating. The results demonstrated the highbarrier effect of the coating containing 5 wt% of MMT/Si. Adhesion evaluation after a salt spray testexhibited a high adherence to the epoxy coating containing MMT/Si.
Abstract
Layered silicate clay montmorillonite (MMT) has been used in nanocomposite coating to improve corrosionprotection by reinforcing the barrier property. The better dispersion of MMT in the coating produces ahigher barrier effect. Pretreatment with MMT could favor the delamination of clay platelets, facilitatingMMT dispersion in the coating. In the present work, a montmorillonite/silica (MMT/Si) composite wasprepared by the in situ sol-gel method. x-ray diffraction measurements and field-emission scanning electronmicroscopy observations showed silica crystal formation and increased basal spacing between theMMT platelets. Composite MMT/Si particles were introduced in an epoxy resin to reinforce the corrosionprotection of the coating applied on the AA2024 surface. Electrochemical impedance spectroscopy (EIS)was performed to characterize the protective property of the coating. The results demonstrated the highbarrier effect of the coating containing 5 wt% of MMT/Si. Adhesion evaluation after a salt spray testexhibited a high adherence to the epoxy coating containing MMT/Si.
참고문헌 (21)
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