Sandwich-structured rGO/PVDF/PU multilayer coatings for anti-corrosion application. Issue 54 (5th July 2017)

• Record Type: Journal Article
• Authors: Xiao, Yuan-Kai; Ji, Wei-Fu; Chang, Kuei-Sen; Hsu, Kuei-Ting; Yeh, Jui-Ming; Liu, Wei-Ren
• Is Part Of: RSC advances. Volume 7:Issue 54(2017)
• Page Start: 33829
• Page End: 33836
• Publication Date: 2017-07-05
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra05674e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : We successfully construct rGO/PVDF/PU sandwich-structured composite coatings. The composite film demonstrates excellent anti-corrosion effects for metal protection due to its strong mechanical properties. Abstract : In this study, we fabricated a novel sandwich structure by combining reduced graphene oxide (rGO), polyvinylidene difluoride (PVDF) and polyurethanes (PU) to construct a composite film for anti-corrosion applications. The corrosion performances of the rGO/PVDF/PU multi-layered coatings on carbon steel were evaluated in 30 wt% boiling sulfuric acid solution for 1 h and 3.5 wt% NaCl electrolyte for electrochemical tests. The results show that the addition of PU and rGO dramatically improves the anti-corrosion performance of the bare PVDF coating and the optimized content of rGO is 7 wt%. The anticorrosion performances of corrosion potential, corrosion current and protection efficiency after protection coating are measured to be −757 mV, 0.1 μA cm −2 and 99%, respectively. The excellent results obtained could be explained by barrier effects, where the hydrophobic property and high-aspect-ratio of rGO in the PVDF matrix inhibit corrosion factors from diffusing into the substrate.