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

Abstract

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.

Keywords

• 15-5ph|ticrn film|environment condition|corrosion resistance