以M38合金作基材,先电镀Pd-20wt%Ni合金,再采用传统低温高活性(LTHA)固渗铝工艺,用NaCl作活性剂渗铝制得Pd-Ni-Al涂层.XRD和EPMA分析结果表明,涂层为固溶Ni的β-PdAl单相结构;在900℃Na2SO4熔盐中的热腐蚀结果表明,Pd-Ni-Al涂层在1500h出现局部剥落,1600h发生灾难性腐蚀;Pt-Al涂层在1600～1800h时也由氧化皮局部剥落发展到涂层失效.900℃Na2SO4+25%NaCl熔盐中的热腐蚀试验也表明,Pd-Ni-Al涂层的热腐蚀性能优于单渗铝涂层.
参考文献
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