石墨烯/碳纳米管增强氧化铝陶瓷涂层的耐腐蚀性能研究

为了提高氧化铝陶瓷涂层性能,将碳纳米管及石墨烯的一种或两种材料植入涂层中。并对氧化铝陶瓷涂层开展电化学试验进行耐腐蚀性能研究,研究结果表明:添加0.2%石墨烯和0.2%混杂功能化碳纳米管的复合涂层的耐腐蚀性能最优异,电流密度从2.890×10^-6 A/cm^2下降到1.536×10^-6 A/cm^2,电阻抗从11388Ω提高到28079Ω,耐腐蚀效率最大46.85%。微观结构表明,相比于纯的氧化铝涂层,碳纳米管和石墨烯的植入能提高陶瓷涂层的致密性,同时,碳纳米管和石墨烯的结构能够有效阻断裂纹扩散,从而起到保护基体的作用。

Study on Corrosion Resistance of Graphene/Carbon Nanotubes Reinforced Alumina Ceramic Coatings

To improve the corrosion resistance of the alumina ceramic coating, the carbon nanotube and gaphene are selected as the reinforcement. The corrosion behavior was investigaed based on the electrochemical experiment. The result shows that, the ceramic coating reinforced with both carbon nanotubes and graphene shows the best corrosion resistances among all samples. The corrosion current density of this coating decreases from 2.890×10-6 A/cm^2(the corrosion current density of pure substrate)to 1.536×10-6 A/cm^2. Besides, the electrical impedance increases from 11388 Ω to 28079 Ω, and corrosion resistant efficiency reaches to 46.85%. The Micro-structure investigation shows that, compared with pure alumina coating, The addition of carbon nanotubes and graphene can improve the compactness of the ceramic coating. In addition, the structure of carbon nanotubes and graphene can effectively block the crack diffusion, thus protecting the matrix.