Abstract
A facile strategy to boost anticorrosion potency of graphene oxide/silica hybrid sol-gel coating is developed through fully exploiting the capabilities of graphene oxide (GO). Together with a barrier to corrosives and crack inhibitor, GO was further explored herein as a regulator to regulate the gelation process and provide robust coating films with stratified microstructures and ultimately extended diffusion paths. The sol-gel coating with stratified microstructure achieved on AA5052 aluminum alloy surface afforded greatly enhanced corrosion protection capability as assessed by electrochemical measurements and immersion tests. The corrosion current density of the sample of a hybrid GO sol-gel film was about 30 times less than that of sample of pure sol-gel film sample. The regulation mechanism of GO during the film formation process and the anticorrosive protection properties of the film were discussed.
Highlights
Aluminum alloys have the advantages of good installation and transportation [1,2], light weight and high specific strength
The results demonstrated that graphene oxide (GO) can be covalently functionalized with silanol from silane coupling agents
The results showed that the incorporated GO can covalently bond with the sol particles and form a robust heterojunction and induce the formation of a stratified structure
Summary
Aluminum alloys have the advantages of good installation and transportation [1,2], light weight and high specific strength. It is difficult to fabricate crack-free, thick enough sol-gel coating films with sufficient corrosion protection capabilities [10]. The surface of colloid microspheres can be homogeneously coated with GO through electrostatic interaction We envisioned that these properties and techniques could be utilized to renovate the solgel coating structure and boost the corrosion protection capabilities of sol-gel composite coating films. The Scheme 1d show the synthesis schematic diagram of sol-gel, positively charged sol particles and negatively charged GO evenly mixed to obtain the coating and both the electrostatic interaction and the bonding be-tween GO and sol are employed to regulate the structure of the coating. The introduction of negatively charged GO prompts the gelation of the positively charged silica sol to form a stratified structure of hybrid sol-gel/GO film.
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