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首页> 外文期刊>Journal of Materials Engineering and Performance >Corrosion Resistant Modified Aluminide Coatings
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Corrosion Resistant Modified Aluminide Coatings

机译：耐腐蚀改性铝化物涂料

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摘要

The requirements for increasing operating temperatures in gas turbines and fuel fired energy systems is linked to the use of protective coatings able to improve oxidation and corrosion resistance of structural materials. MCrAlY-type overlay coatings have been especially designed to protect airfoils and other hot gas component superalloys against hot corrosion induced by molten salts in lower grade fuel and aggressive environments. However, aluminide coatings modified by additional elements have gained renewed interest because they offer an economical alternative to physical vapor deposition or plasma spray coating processes used to apply the MCrAlY's. Of the possible modifiers, chromium and platinum are the most prevalent elements used. Although they have been in field service for a number of years, there are some controversies on the reasons for their beneficial effects. The present literature on the corrosion behavior of chromium and platinum modified coatings is reviewed and updated in light of the structural dependence of corrosion resistance for both coating types. The formation mechanisms and the related structures of chromium aluminides are presented together with results of recent investigations aimed at defining the structural variations of platinum aluminide coatings which depend on the deposition parameters, that is, the platinum prealuminizing treatment and the subsequent aluminizing process.
机译：燃气轮机和燃油能源系统中提高工作温度的要求与使用能够改善结构材料的抗氧化性和耐腐蚀性的保护涂层有关。 MCrAlY型表面涂层经过专门设计，可保护机翼和其他热气成分高温合金，使其免受低级燃料和侵蚀性环境中熔融盐引起的热腐蚀。但是，通过添加元素改性的铝化物涂层引起了人们的新兴趣，因为它们为使用MCrAlY的物理气相沉积或等离子喷涂工艺提供了经济的选择。在可能的改性剂中，铬和铂是最常用的元素。尽管它们已经在现场服役了多年，但对于它们产生有益效果的原因仍存在一些争议。鉴于两种涂层类型的耐腐蚀性能的结构相关性，对有关铬和铂改性涂层的腐蚀行为的现有文献进行了综述和更新。介绍了铝化铬的形成机理和相关结构，以及最近的研究结果，这些研究旨在确定取决于沉积参数的铂铝化物涂层的结构变化，即铂的预铝化处理和后续的铝化工艺。

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