The effect of FeCrAl sublayer composition on the microstructure and lead-bismuth eutectic corrosion behavior of the FeCrAl/YSZ (Yttria-stabilized zirconia) composite coatings was systematically investigated by SEM and XRD. The results show that the FeCrAl sublayer as a diffusion barrier and a bonding layer is beneficial to improve the corrosion resistance of the coatings. After corrosion, a slow-growing, continuous, and protective Al-rich oxide is formed at the interface between the YSZ and FeCrAl sublayer, which effectively hinders the inward diffusion of oxygen atoms and the outward diffusion of iron atoms. Especially, the Fe-12Cr-7Al/YSZ coating exhibits the best corrosion resistance even after corrosion at 700 °C. The microscopic corrosion mechanism of FeCrAl/YSZ coatings is elucidated.

中文翻译：

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FeCrAl亚层成分对FeCrAl/氧化钇稳定氧化锆复合涂层微观结构和耐蚀性的影响

通过SEM和XRD系统研究了FeCrAl亚层成分对FeCrAl/YSZ（氧化钇稳定氧化锆）复合涂层微观结构和铅铋共晶腐蚀行为的影响。结果表明，FeCrAl亚层作为扩散阻挡层和结合层有利于提高涂层的耐腐蚀性能。腐蚀后，YSZ和FeCrAl亚层之间的界面处形成缓慢生长的、连续的、具有保护性的富Al氧化物，有效阻碍氧原子向内扩散和铁原子向外扩散。特别是Fe-12Cr-7Al/YSZ涂层即使在700℃腐蚀后仍表现出最好的耐腐蚀性。阐明了FeCrAl/YSZ涂层的微观腐蚀机理。