Abstract The coupling effect of immersion corrosion and cavitation erosion of HVOF-sprayed NiCoCrAlYTa coatings in artificial seawater is studied, in this work. The oxidized zone and its boundary on the coating surface are corroded, preferentially. Interestingly, an (Al, Cr)-rich passive scale forms on the coating surface after immersion corrosion, which would enhance its mechanical and anti-corrosion properties. The coating presents better cavitation erosion resistance, despite the coupling effect between corrosion and cavitation erosion causes the aggravation of the cavitation damage. The cavitation loss mainly is attributed to the fatigue failure and spalling of splats in the coatings.

中文翻译：

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NiCoCrAlYTa涂层在人工海水中浸蚀与空蚀的耦合效应

摘要 本文研究了超音速火焰喷涂NiCoCrAlYTa涂层在人工海水中浸蚀和空蚀的耦合效应。氧化区及其在涂层表面的边界被优先腐蚀。有趣的是，浸渍腐蚀后涂层表面会形成富含 (Al, Cr) 的钝化氧化皮，这将增强其机械和防腐性能。尽管腐蚀和气蚀之间的耦合作用会导致气蚀损伤的加剧，但涂层表现出更好的抗气蚀性能。空化损失主要归因于涂层中的疲劳破坏和碎屑剥落。