The multiscale effects of graphene oxide on the corrosion resistance properties of waterborne alkyd resin coatings
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The multiscale effects of graphene oxide on the corrosion resistance properties of waterborne alkyd resin coatings Juanjuan Li1, Huan Zhang1, Furong Sun1, Hong Zhou2, Lijuan Zhao1,a), Yongjiao Song1,b) 1
College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, China Aerochemical Materials Department, The Second Research Institute of Civil Aviation Administration of China, Chengdu 610041, China a) Address all correspondence to these authors. e-mail: [email protected] b) e-mail: [email protected] 2
Received: 14 August 2018; accepted: 6 December 2018
Graphene oxide (GO) is a promising material in improving the corrosion resistance properties of metals. This improvement significantly relies on the microstructure and electrical properties of GO, which nevertheless is rarely studied. Here, multiscale GOs with different flake sizes and oxidation degrees were fabricated and incorporated into waterborne alkyd resin (AR). The physical and chemical structures of GO and AR/GO composites were characterized in detail. Multiscale GOs are successfully prepared, and the corrosion resistance of AR/GO coatings is measured by electrochemical workstation. Electrochemical experiments indicate that GOs with larger flake sizes have excellent barrier properties due to the shielding effect; GOs with appropriate oxidation degrees could effectively improve the dispersion of GO and avoid the conductive path of GO in the matrix, because oxidation degree of GO could influence the dispersion and electrical properties. The corrosion protection efficiency of AR/GO(GO: 120 lm, 1.5 wt%, sp2/sp3 5 2.61) is 98.14%, which is 2.26 times higher than AR. The multiscale effects of GO on the corrosion resistance property of AR coatings are quite general, thus providing guidelines for developing highly efficient corrosion resistant coatings for practical usage.
Introduction Metal corrosion causes economic losses and waste of resources in the modern metallic industry [1]. Reports showed that the global economic losses and metallic waste caused by metal corrosion were about 900 millions/year and 100 million tons/ year, respectively. To solve this problem, many materials including organic [2], inorganic [3, 4] and polymeric coatings [5, 6, 7, 8] were investigated. Lightweight graphene/GO with chemical stability, antibacterial activity, outstanding barrier property, and excellent thermal and electrical properties was reported to be a promising material on the protection of metal from corrosive environment [9, 10, 11, 12]. Graphene grown by the chemical vapor deposition (CVD) method has been applied in the metal substrates earlier [13, 14]. The CVD method could obtain a large area of graphene film directly on the metal surface which was used as a protective coating. Chen et al. firstly studied the oxidation resistance of the graphene films grown on the surface of Cu and Cu/Ni alloy by the CVD method [15]. Results showed that the surface of metal substrate was passivated due to the impermeability and
ª Materials Research Society 2
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