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Graphene oxide film as a protective barrier for Mg alloy: Worse or better is dependent on a chemical reduction process.
- Source :
-
Carbon . Apr2019, Vol. 145, p389-400. 12p. - Publication Year :
- 2019
-
Abstract
- Poor corrosion and wear resistances of Mg alloys have severely restricted their extensive applications. Here we report a comparative study of bioinspired graphene oxide(GO)/reduced graphene oxide (rGO)-polyvinyl alcohol (PVA) composite films with nacre-like architectures on Mg alloys, via a facile reduction process. GO-PVA film remarkably deteriorates the corrosion resistance of Mg alloy, with an increased corrosion rate of 3.657 × 10−5 from 2.038 × 10−5 A/cm2, due to its loose microstructure and typical cathodic reaction. In contrast, the removal of oxygen-containing groups by chemical reduction leads to a recovery of conjugated structure and reduces the intrinsic capillaries, and the corrosion rate of rGO-PVA film is 18 times lower than that of GO-PVA film, through hindering the galvanic corrosion and weakening the cathodic reaction. Additionally, the wear rate of Mg alloys protected by GO/rGO-PVA films remarkably decreases by 98.6% and 98.2%, respectively. The chemical reduction effectively decreases the cluster-stacked structure on the surface of the GO-PVA film and restricts its exfoliation behavior, which promotes the puckering effect and results in a slightly enhanced wear behavior of the rGO-PVA film. The current study demonstrates a potential prospect of the bioinspired graphene-based film, which is beneficial to achieving the integrated anti-corrosive/wearable performances of metallic materials. Image 1 [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00086223
- Volume :
- 145
- Database :
- Academic Search Index
- Journal :
- Carbon
- Publication Type :
- Academic Journal
- Accession number :
- 136115952
- Full Text :
- https://doi.org/10.1016/j.carbon.2019.01.037