Effects of varying graphene nanoplates addition on anticorrosive properties of graphene nanoplates-40%Zn/epoxy coating
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摘要: 将不同质量比的石墨烯纳米片(Gnps)添加到40% Zn粉含量的Zn/环氧(EP)涂层中,制备出Gnps-40% Zn/EP复合涂层,并制备Zn粉含量为70%的Zn/EP涂层作为对比涂层。采用拉曼光谱、SEM、盐雾试验、电化学测试等技术,研究不同Gnps添加量对Gnps-40% Zn/EP涂层屏蔽性能和阴极保护效果的影响。对比Gnps-40% Zn/EP复合涂层与70% Zn/EP涂层的防腐性能,探究了添加Gnps来降低涂层Zn粉含量的可能性。构建不同Gnps添加量的Zn/EP复合涂层的防腐模型,进一步阐明不同涂层防腐机制的差异。结果表明:Gnps在涂层中的分散性良好,其无序度随着Gnps添加量的增加呈线性增大;当Gnps添加量为0.3%、0.5%和1.0%时,可以明显提高Zn/EP涂层的物理屏蔽性能;当Gnps添加量为0.5%和1.0%时,可以显著改善Zn/EP涂层牺牲阳极的阴极保护效果;当Gnps添加量为1.5%时,对涂层屏蔽性能和阴极保护效果的改善均不明显。对于Gnps-40% Zn/EP复合涂层,Gnps最佳添加量为0.5%~1.0%。通过添加适量Gnps,可以降低Zn/EP涂层中的Zn粉含量,从而降低生产成本。
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关键词:
- 石墨烯纳米片 /
- Zn/环氧(EP)涂层 /
- 屏蔽性能 /
- 阴极保护效果 /
- 防腐模型
Abstract: Different mass ratios of graphene nanoplates (Gnps) were added into Zn/epoxy (EP) coatings with 40%Zn content to prepare Gnps-40%Zn/EP composite coatings. The Zn/EP coating with 70%Zn content was also prepared as the contrast. The Raman spectra, SEM, salt spray test and electrochemical technique et al were applied to evaluate the barrier property and cathodic protection effect of Gnps-40%Zn/EP composite coatings. The anticorrosive effects of Gnps-40%Zn/EP composite coatings and 70%Zn/EP coating were compared to explore the possibility of reducing Zn content by adding Gnps into Zn/EP coating. To further clarify anticorrosive mechanism of Zn/EP coating with varying Gnps addition, the anticorrosive model was established. The results indicate that Gnps could be well-dispersed into Zn/EP coatings, but disorder parameter of Gnps increases with the increasing of Gnps addition. While Gnps addition are 0.3%, 0.5% and 1.0%, the physical shielding performance of Zn/EP coating can be significantly improved; while Gnps addition are 0.5% and 1.0%, the cathodic protection effect of Zn/EP coatings can be significantly enhanced; While Gnps addition is 1.5%, both shielding performance and cathodic protection effect of Zn/EP coatings are not obviously improved. For Gnps-40%Zn/EP composite coating, the best addition range of Gnps is 0.5%-1.0%. The suitable addition of Gnps can reduce Zn content in Zn/EP coating and lower the production cost.
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