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The effect of graphene orientation on permeability and corrosion initiation under composite coatings
Highlights A novel model is introduced to describe the relationship between the orientation degree of graphene sheets and their protection performance. The diffusion, flux, and, corrosion initiation time of corrosive species in graphene-based composite coatings are estimated. The corrosion initiation of the substrate by means of graphene dispersion in epoxy is postponed. The mismatch angle of 10° can slow down the diffusion process significantly and delay the corrosion initiation.
Abstract The unique anisotropic properties of graphene, particularly impermeability, have made it a promising candidate for further advances in corrosion prevention applications. Despite the large number of experimental works divulging the use of graphene in anticorrosion coatings, there is no report on the numerical modelling and simulation of the relationships between the orientation of graphene sheets in composite coatings and the introduced corrosion protection efficiency, to our knowledge. Herein, it is tried to model the influence of the orientation of graphene sheets dispersed in organic coatings on the diffusivity and flux of corrosive substances besides the corrosion initiation time of the protected substrates. To discover the relationship between the graphene orientation and corrosion-related phenomena, this study introduces a novel model consisting of a trigonometric factor named unprotected projected surface area proportion, which calculates corrosion-related parameters based on the principal Fick’s laws. The model reveals that the decrease in the angle between graphene sheets and the substrate is highly beneficial for postponing the corrosion onset. It is accordingly estimated that a mismatch angle of 10° can slow down the diffusion process significantly and delay the corrosion initiation by around 65 times in a 100 μm thick epoxy/graphene composite coating in comparison to the counterpart with the perpendicular alignment. The predicted corrosion parameters were in a good agreement with the experimental data, indicating the merit of the proposed model. Thus, this model can be further employed as the fundamental of future research on the optimum graphene orientation in anticorrosion composite coatings.
The effect of graphene orientation on permeability and corrosion initiation under composite coatings
Highlights A novel model is introduced to describe the relationship between the orientation degree of graphene sheets and their protection performance. The diffusion, flux, and, corrosion initiation time of corrosive species in graphene-based composite coatings are estimated. The corrosion initiation of the substrate by means of graphene dispersion in epoxy is postponed. The mismatch angle of 10° can slow down the diffusion process significantly and delay the corrosion initiation.
Abstract The unique anisotropic properties of graphene, particularly impermeability, have made it a promising candidate for further advances in corrosion prevention applications. Despite the large number of experimental works divulging the use of graphene in anticorrosion coatings, there is no report on the numerical modelling and simulation of the relationships between the orientation of graphene sheets in composite coatings and the introduced corrosion protection efficiency, to our knowledge. Herein, it is tried to model the influence of the orientation of graphene sheets dispersed in organic coatings on the diffusivity and flux of corrosive substances besides the corrosion initiation time of the protected substrates. To discover the relationship between the graphene orientation and corrosion-related phenomena, this study introduces a novel model consisting of a trigonometric factor named unprotected projected surface area proportion, which calculates corrosion-related parameters based on the principal Fick’s laws. The model reveals that the decrease in the angle between graphene sheets and the substrate is highly beneficial for postponing the corrosion onset. It is accordingly estimated that a mismatch angle of 10° can slow down the diffusion process significantly and delay the corrosion initiation by around 65 times in a 100 μm thick epoxy/graphene composite coating in comparison to the counterpart with the perpendicular alignment. The predicted corrosion parameters were in a good agreement with the experimental data, indicating the merit of the proposed model. Thus, this model can be further employed as the fundamental of future research on the optimum graphene orientation in anticorrosion composite coatings.
The effect of graphene orientation on permeability and corrosion initiation under composite coatings
Shaker, Majid (author) / Salahinejad, Erfan (author) / Cao, Weiqi (author) / Meng, Xiaomin (author) / Zahedi Asl, Vahdat (author) / Ge, Qi (author)
2021-12-09
Article (Journal)
Electronic Resource
English
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