The overarching goal of present study is to investigate the effects of Ir and Pd additions on the oxidation behaviour of PtAl coatings. Prior to depositing standard PtAl coating, Ir layer was electroplated by IrBr₃ aqueous solution while Pd layer was prepared using electroless deposition. Comparing with normal PtAl coating, cyclic oxidation tests were carried out on both the Ir- and Pd-modified aluminide coatings. The results showed that Ir-modified PtAl coating exhibited better oxidation resistance than both Pd-modified and normal PtAl coatings because Ir partly served as diffusion barrier to reserve Al while Pd did not.

中文翻译：

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铱和钯对PtAl涂层抗氧化性的影响

本研究的总体目标是研究Ir和Pd的添加对PtAl涂层氧化行为的影响。在沉积标准PtAl涂层之前，将Ir层用IrBr ₃水溶液电镀，同时使用无电沉积制备Pd层。与普通的PtAl涂层相比，对Ir和Pd改性的铝化物涂层都进行了循环氧化测试。结果表明，Ir改性的PtAl涂层比Pd改性的PtAl涂层和普通PtAl涂层均具有更好的抗氧化性，因为Ir部分地充当了扩散壁垒以保留Al，而Pd则没有。