新型聚氨酯/锌烯防腐涂层失效过程试验研究

Experimental Investigations on the Failure Process of Polyurethane/Zinc-Graphene Coating

以石墨烯为添加剂的新型聚氨酯/锌烯涂层防护体系为研究对象,根据飞机服役环境编制的加速老化试验谱,在实验室进行加速老化试验,对不同老化周期的涂层进行电化学阻抗测量,并依据电化学阻抗谱的特征将涂层失效过程分为4个阶段,通过扫描电镜-能量扩散谱(SEM-EDS)和三维立体显微镜等手段观察涂层在老化过程中的形貌变化。基于水和腐蚀介质的渗透过程建立了涂层失效过程的物理模型,对该新型涂层的失效过程进行了分析与研究,了解了该型涂层的失效机理。

Taking a novel polyurethane/graphene-zinc coating protection system as the research object,according to accelerated aging test spectrum of aircraft service environment,the accelerated aging test is conducted in the laboratory by the electrochemical impedance measurement of coatings with different aging period.According to the characteristics of electrochemical impedance spectroscopy,the coating failure process is divided into four stages.The scanning electron microscopeenergydiffusion spectrum（SEM-EDS）and three-dimensional microscopy are used to observe the morphology of the coating changes during the aging process.Based on the infiltration process of water and corrosion medium the physical model of coating failure process is established,and the failure process of the novel coating is analyzed and studied to find the failure mechanism of the coating.