摘要
研究了用二氯二氨基钯为主盐电镀Ｐｄ 及ＰｄＮｉ 合金的配方及工艺条件，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βＰｄＡｌ 或固溶Ｐｄ 的βＮｉＡｌ 单相结构，随工艺改变，涂层中Ｐｄ、Ｎｉ 含量不同．
The plating bath with Pd(NH 3) 2Cl 2 and the related process for electrodeposition of palladium and palladium\|nickel alloys were described, which were pre\|applied for preperation of Pd\|modified aluminide coatings on the cast nickel\|base superalloy M38 by pack cementation. EPMA, XRD and SEM were adopted to characterize the distribution of elements, the phase constituent and morphology of cross section of the Pd\|modified aluminide coatings respectively in detail. A major difference with Pt\|modified aluminide coatings may attribute to that the Pd containing zone was a single phase of the known β\|(Pd xNi 1\|x )Al. The aluminum concentration remained constant (55at%～60at%) across the outer layer of coating and balanced with the total concentration of palladium and nickel, in spite of a negative palladium concentration gradient.
出处
《腐蚀科学与防护技术》
CAS
CSCD
2000年第1期6-11,共6页
Corrosion Science and Protection Technology
基金
金属腐蚀与防护国家重点实验室资助项目
关键词
电镀
铝化物涂层
钯
钯合金
钯改性
palladium, Pd\|Ni alloy plating, aluminide coating, manufacturing, structure
