研究了用二氯二氨基钯为主盐电镀Ｐｄ及Ｐｄ－Ｎｉ合金的配合及工艺条件，再通过传统固渗铝方法制备高温合金Ｍ３８的防护涂层。研究了镀层状态、渗铝方式、渗铝活化剂、预扩散处理等工艺条件对钯改性铝化物涂层组织的影响，经ＸＲＤ，ＥＰＭＡ及金相观察，发现该涂层为固溶Ｎｉ的β－ＰｄＡｌ或固溶Ｐｄ的β－ＮｉＡｌ单相结构，随工艺改变，涂层中Ｐｄ，Ｎｉ含量不同。
The plating bath with Pd(NH3)zC1z and the related process for electdeposition of palladium and palladium-nickel alloys were described, which were pre-applied for prepexation of Pd-dified aluminide coatings on the cast nickel-base superalloy M38 by pack cementation. EM, XRn and SEM were adopted to characterize the distribution of elements, the phase constituent and mrpholcgy of cross section of the Pd- ified aluminide coatings respectively in detail. A major difference with Pt-dified aluminide coatings may amibute to that the Pd containing zone was a single phase of the known P-(Pd,Ni,.,) Al. The aluminum concentration remained constant (55at % -60at % ) acnxss the outer layer of coating and balanced with the total concentration of palladium and nickel, in spite of a negative palladium concentration gradient.
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