海洋环境下飞机结构涂层的耐腐蚀性能研究

Study on corrosion resistance of coatings on aircraft structures under marine environment

在海洋环境下服役的飞机,由于长期遭受海水、盐雾等恶劣环境的影响,极易造成飞机结构的腐蚀。为了提高飞机结构的耐腐蚀性能,采用等离子喷涂与激光熔覆两种技术在304不锈钢基体表面制备了铁基非晶涂层,借助扫描电子显微镜、X射线衍射仪、维氏硬度计等仪器考察了涂层的微观组织形态和显微硬度。在模拟海水的腐蚀环境下,通过测量极化曲线和电化学阻抗谱,探究了铁基非晶涂层的腐蚀行为。结果表明,这两种表面技术制备的铁基非晶涂层都具有良好的耐腐蚀性能,可以降低飞机结构的腐蚀速率,从而保障飞行运行安全。

The aircraft serving in the marine environment is easy to cause the corrosion of its structure due to the long-term influence of the harsh environment such as seawater and salt mist.In order to improve the corrosion resistance of aircraft structure,plasma spraying and laser cladding were used to prepare Fe-based amorphous coatings on the surface of 304 stainless steel.The microstructures of the coatings were characterized by scanning electron microscopy(SEM)and X-ray diffraction(XRD),and their microhardness was tested using a Vickers hardness meter.The corrosion behavior of Fe-based amorphous coatings in the simulated seawater environment was studied by potentiodynamic polarization curve measurement and electrochemical impedance spectroscopy.The results showed that the Fe-based amorphous coatings prepared by these two surface technologies have good corrosion resistance,and can reduce the corrosion rate of aircraft structure,so as to ensure the safety of flight operation.