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Boro-aluminising of P91 steel by pack cementation for protection against steam oxidation

机译：通过填充胶结对P91钢进行硼铝化处理以防止蒸汽氧化

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摘要

High performance alloys are often the materials used for various components exposed to high temperature environments. In many cases, protective coatings are applied in these alloys, providing higher corrosion and oxidation resistance, compared to the base material. This study investigates the feasibility to apply boro-aluminising treatment on P91 steel by pack cementation process, to increase the steel high temperature properties in oxidising and corrosive environments. Packs activated by AlCl_3, NH_4Cl and KBF_4 were used to carry out the coating deposition at a temperature of 715℃ for 6 h. The coating formed was analysed by means of SEM and XRD, and the compounds formed were identified. Cyclic steam oxidation for a total of 1008 h at 650℃ revealed an oxide scale of 50 μm for the uncoated P91 steel, while the coated steel shows practically no oxidation effect.
机译：高性能合金通常是用于暴露于高温环境的各种组件的材料。在许多情况下，与基础材料相比，在这些合金中施加了保护涂层，从而提供了更高的耐腐蚀性和抗氧化性。本研究探讨了通过填充胶结工艺对P91钢进行硼铝化处理以提高钢在氧化和腐蚀环境中的高温性能的可行性。用AlCl_3，NH_4Cl和KBF_4活化的填料在715℃的温度下进行6 h的涂层沉积。通过SEM和XRD分析形成的涂层，并鉴定形成的化合物。在650℃循环蒸汽氧化1008 h时，未涂覆的P91钢的氧化皮为50μm，而涂覆的钢几乎没有氧化作用。

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