15-5PH不锈钢表面沉积TiCrN薄膜的耐环境腐蚀性能研究

Study on Environmental Corrosion Resistance of TiCrN Film Deposited on the Surface of 15-5PH Stainless Steel

为了进一步解决飞行器金属结构材料面临的环境腐蚀问题,采用多弧离子镀技术在15-5PH不锈钢表面沉积TiCrN薄膜,通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)对样品的物相组成和腐蚀形貌进行表征,利用中性盐雾、酸性盐雾、海洋大气环境暴晒和温湿度环境试验对TiCrN薄膜的耐环境腐蚀性能进行研究。结果表明:15-5PH试样经中性盐雾、酸性干湿盐雾、海洋大气暴露环境腐蚀后,膜层的腐蚀形式为点状腐蚀,基体的腐蚀形式为均匀腐蚀。相比中性盐雾和海洋大气暴露环境,酸性盐雾试验中氢离子与氯离子具有显著的协同效应,从而对TiCrN薄膜表现出更强的腐蚀性。温湿度环境试验考核后,TiCrN膜层表面平整光滑,无裂纹、孔洞、凸起等缺陷。15-5PH不锈钢表面沉积TiCrN薄膜具有一定的耐环境腐蚀能力,满足相关标准规定的温湿度环境试验要求。

Aiming at further solving the environmental corrosion problem faced by aircraft metal structure materials,TiCrN films were deposited on the surface of 15-5PH stainless steel by multi-arc ion plating technology.The phase composition and corrosion morphology of the samples were characterized by X-ray diffraction(XRD)and scanning electron microscope(SEM).Additionally,the environmental corrosion resistance of TiCrN films was studied by means of neutral salt spray,acid salt spray,marine atmospheric environment sun exposure and temperature and humidity environment test.Results showed that the corrosion of film of 15-5PH sample belonged to pitting corrosion in neutral salt spray,acid dry wet salt spray and marine atmospheric exposure environment,and the corrosion of the substrate belonged to uniform corrosion.Compared with neutral salt spray and marine atmospheric exposure environment,hydrogen and chloride had a significant synergistic effect in acid salt spray test,which exhibited stronger corrosion to TiCrN film.After temperature and humidity environmental test,the surface of the TiCrN film was flat and smooth,without cracks,holes,bumps,and other defects.In general,TiCrN film deposited on the surface of 15-5PH stainless steel had certain environmental corrosion resistance and could meet the requirements of temperature and humidity environment test in relevant standards.