Abstract
Mefp-1 adhesive protein derived from marine blue mussels, together with the 2D material graphene, was used to build the green composite film with enhanced anti-corrosion property and mechanical strength. The corrosion inhibition of the composite film, formed by different methods, was evaluated by using electrochemical impedance spectroscopy. The non-degraded adhesion of the composite film to the carbon steel substrate was proved by nano-scratch tests. Infrared spectroscopy was utilized to investigate the film formation process and “three-body interactions” between Mefp-1, graphene and carbon steel surface. The results show that the Mefp-1 adsorbs on the carbon steel surface mainly through the covalent bond between catechols and Fe(III). Meanwhile, Mefp-1 can bond to non-adhesive graphene by forming hydrogen bonds and π−π interaction non-covalent bonds, which facilitate the formation of a robust Mefp-1/graphene composite film on the carbon steel surface.
Highlights
Mussel adhesive proteins (MAPs) extracted from the feet of marine blue mussel have been successfully applied to form films on various surfaces [1]
The corrosion inhibition of the Mefp-1/graphene composite film has been evaluated by the EIS experiments
In relation to the film prepared by the one-step immersion method, the Rp of the composite film is slightly larger than the bare carbon steel at initial stage of exposure, but noticeably increases with the prolonged immersion time after 4 days, which peaks at ca. 2.8 kΩ·cm2 after 8 days’ exposure
Summary
Mussel adhesive proteins (MAPs) extracted from the feet of marine blue mussel have been successfully applied to form films on various surfaces [1]. The oxidation of DOPA to dopaquinone enables the cross-linking of Mefp-1 [6] All these properties of DOPA could enhance the compactness and adhesion to substrates during film formation of Mefp-1 on metal surfaces. Considering the advantages of Mefp-1 and graphene, a surface film combining both materials could potentially achieve both wear and corrosion resistance, and long service life due to good adhesion to substrate. Pioneering investigations explored the possibility of making composite film using Mefp-1 and graphene micro-sheet, and the formed composite film turned out to be corrosion- and wear-resistant on the carbon steel surface [19,20]. Based on the results of the in-depth fundamental investigations, the film formation of the Mefp-1/graphene composite on the carbon steel surface was proposed. The electrophoresis voltage was 10 V and the electrophoresis duration was 5 min
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