Abstract
Graphene oxide (GO) has attractive properties, such as a two-dimensional structure. Because of its hydrophilic characteristic, well-dispersed aqueous solutions are attained. Thus, it is easily incorporated into waterborne resins. For these reasons, in the last years GO nanoparticles have been added to polymers, improving corrosion resistance. This work is focused on the performance of a commercial rust converter (RC) doped with five different RC:GO ratios, namely, 1:0; 1:0.3; 1:0.6; 1:0.9; 1:1.2 (%v/v). The X-ray diffraction technique is used to illustrate the effect of RC and RC + GO additions in the iron oxides. Zeta-potential measurements are performed to assess the surface charge of the GO particles. The corrosion resistances of the rusted samples coated with the five rust converter formulations are studied. The electrochemical impedance spectroscopy (EIS) technique and an electrical equivalent circuit are utilized to explain the experimental results. Additionally, it is found that the optimal RC:GO ratio is between 1:0.3 and 1:0.6. The better corrosion resistance reached is that of the RC:0.3GO ratio.
Highlights
An attractive alternative is the stabilization of the oxide layer before painting by the use of rust converters, which essentially consist of chemical formulations able to transform the iron oxides into a more compact and adherent layer
In a previous work [11], we demonstrated the benefit provided by the addition of oxide (GO) to a commercial rust converter
Gallic aqueous solutions (15 mg·mL−1) with different concentrations of Graphene oxide (GO), 0.28 mg·mL−1, 0.58 mg·mL−1, 0.74 mg·mL−1 and 0.92 mg·mL−1, were prepared. These concentrations were determined taking into account that the amount of gallic acid in the rust converter is around 10% and the RC/GO ratios of 1:0.3; 1:0.6; 1:0.9 and 1:1.2 proposed in this study
Summary
The use of paints for the protection of steel structures is one of the most common strategies to mitigate corrosion. Influence of Graphene Oxide Additions on the Corrosion Resistance of a Rust Converter Primer.
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