Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 27, Pages 32161-32174Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c07148
Keywords
aluminum matrix composites; graphene; deformation-driven metallurgy; corrosion; microstructures; DFT modeling
Funding
- Hei Long Jiang Postdoctoral Foundation [LBH-Z20055]
- Youth Program of the National Natural Science Foundation of China [52001099]
- Outstanding Youth Program of the Heilongjiang Natural Science Foundation [JJ2020JQ0085]
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Deformation-driven metallurgy was used to prepare graphene nanoplatelet-reinforced aluminum matrix composites, resulting in enhanced corrosion resistance through severe plastic deformation and homogeneously dispersed graphene nanoplatelets. The formation of a carbon-doped protective film in a chloride-containing environment contributed to the great corrosion inhibition mechanism of the composites.
Deformation-driven metallurgy was implemented to prepare graphene nanoplatelet (GNP)-reinforced aluminum matrix composites with a time-dependent self-enhancement in corrosion resistance. Severe plastic deformation contributed to the sufficient brokenness, thinning, enfolding, and redispersion of GNPs, as well as grain refinement. The homogeneously dispersed GNPs showed a great corrosion inhibition mechanism in a chloride-containing environment, ascribed to the formation of a carbon-doped protective film via diffusion and chemical bonding between GNPs and the surface oxide film. Electrochemical and intergranular corrosion tests were conducted to show the enhancement of long-term corrosion resistance. First-principles calculations were performed to explore the high corrosion resistance of the carbon-doped protective film. The energy barriers of vacancy formation, Cl ingress, and charge transfer were synchronously enhanced with the addition of GNPs into aluminum matrix composites as long-term corrosion inhibitors.
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