Corrosion behavior of Al–O coating in oxygen-saturated lead-bismuth eutectic at 550 °C
T. Zhang, Jiaojiao Ma, Weizheng Liu, Chuiyi Meng, Wei Qi, Hui Wang, Xiujie He
Abstract
The amorphous Al-O coating with a thickness of approximately 6 μm was prepared on 316L stainless steel using multi-arc ion plating technology to investigate the corrosion resistance of the coating in static lead–bismuth eutectic at 550 °C. The corrosion time ranged from 100 to 1000 h. The samples were characterized using different instruments, and the results showed that the Al-O coating had poor wettability and could effectively protect the substrate material from lead–bismuth corrosion in a static lead–bismuth eutectic. However, during the long-term high-temperature corrosion process, the coating changes from an amorphous phase to a polycrystalline doped structure, resulting in pores on the coating. Further, elemental interdiffusion was identified between the substrate and coating, indicating risk of coating failure.