Abstract
In this paper, four composite coatings of nano-SnS/polyvinylbutyral (PVB), nano-MoS2/PVB, nano-SnS-Zn/PVB, and nano-MoS2-Zn/PVB were prepared, and their anti-corrosion mechanism was analyzed by experimental and theoretical calculations. The results of the electrochemical experiments show that the effect of nano-MoS2 on the corrosion protection performance of PVB coating is better than that of nano-SnS in 3% NaCl solution, and that the addition of Zn further enhances this effect, which is consistent with the results of weight loss measurements. Furthermore, the observation of the corrosion matrix by the field emission scanning electron microscope (FESEM) further confirmed the above conclusion. At last, the molecular dynamics (MD) simulation were carried out to investigate the anti-corrosion mechanism of the nanofillers/PVB composites for the copper surface. The results show that both nano-SnS and nano-MoS2 are adsorbed strongly on the copper surface, and the binding energy of nano-MoS2 is larger than that of nano-SnS.
Highlights
Copper has good thermal and electrical properties, and is a commonly used material in marine engineering
The corrosion resistance of various coatings to copper was investigated by weight loss measurements after immersion in a 3.0% NaCl solution at 293 K for 35 days
The molecular dynamics (MD) simulation results are in good agreement with the results obtained from potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS), which is further confirm that the excellent anti-corrosion performance of MoS2/PVB is attributed to its high interfacial binding energy
Summary
Copper has good thermal and electrical properties, and is a commonly used material in marine engineering. Conventional graphene materials have been used as fillers in anti-corrosion coatings due to their high surface-to-volum ratio and excellent physical properties. They have a ‘corrosion-promoting activity’ when the coating is broken because of good electrical conductivity [9,11], which promotes the corrosion of the metal substrate. We consider adding nano-MoS2 as a filler to the coating to verify its protection against metallic copper. Our current work aims to study and compare the corrosion protection performance of nano-SnS and nano-MoS2 on polyvinylbutyral (PVB) coatings and zinc-rich PVB coatings. Molecular dynamics (MD) simulations were used to study the adsorption properties of nano-SnS/PVB and nano-MoS2/PVB on copper surfaces
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