Alumina coating which has excellent corrosion resistance to lead–bismuth eutectic (LBE) is very promising to be used in future LBE cooling system. In this paper, the AlO/Fe-Al gradient coating is prepared on the surface of SIMP steel assisted by ionic liquid aluminum electroplating and subsequent heat treatments and selective oxidation. The protective AlO layer is composed of much γ-phase and a small amount α-phase. The Fe-Al transition layer is mainly composed of FeAl alloy phase. After being exposed for 600 h to LBE at 600 °C, the coating still maintains intact and dense structure and good compatibility to the substrate, effectively preventing the substrate steel from the corrosion attack of LBE. While obvious LBE attack can be observed in the compared bare steel. Finally, to verify the possibility of this approach preparing AlO/Fe-Al coating on complex geometries, we have also successfully prepared this sort of coating on the inner surface of a steel tube, indicating that this coating has a great application potential in the future.

中文翻译：

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离子液体辅助制备Al2O3/Fe-Al梯度涂层耐铅铋共晶腐蚀研究

氧化铝涂层具有优异的耐铅铋共晶（LBE）腐蚀性能，非常有希望在未来的LBE冷却系统中得到应用。本文通过离子液体铝电镀以及后续热处理和选择性氧化辅助，在 SIMP 钢表面制备了 Al2O3/Fe-Al 梯度涂层。Al2O保护层由大量γ相和少量α相组成。Fe-Al过渡层主要由FeAl合金相组成。在600℃的LBE中暴露600h后，涂层仍保持完整致密的结构以及与基体良好的相容性，有效防止基体钢材受到LBE的腐蚀攻击。而在对比裸钢中可以观察到明显的LBE攻击。最后，为了验证该方法在复杂几何形状上制备Al2O/Fe-Al涂层的可能性，我们还在钢管内表面成功制备了该涂层，表明该涂层在未来具有巨大的应用潜力。