用磁控溅射方法在电解纯Ni上溅射了一层与其成分相同的纳 米晶涂层.研究了纯Ni及其溅射纳米晶涂层在700℃～900℃的氧化行为.结果表明：在同一温 度下，纳米晶纯Ni的氧化增重高于纯Ni，即经溅射纳米化纯Ni的氧化速率变快.利用扫描隧 道显微镜、带能谱的扫描电镜和X射线衍射对样品的表面和截面进行了分析，并讨论了其氧 化机理.
A nanocrystalline coating with the same compositio n as pure Ni was deposited on the pure Ni substrate by means of magnetron sputte ring.The oxidation behavior of pure Ni and its sputtered nanocrystalline coatin g in air at 700℃～900℃ was studied.The samples were examined by scanning tunne l microscopy(STM),scanning electron microscopy(SEM)with energy dispersive X-ray (EDX)and X-ray diffraction(XRD).The results indicated that the mass gain of t he nanocrystalline pure Ni was higher than that of normal grain-sized pure Ni at the same temperature.Nanocrystallization accelerated the oxidation of pure Ni,e specially at the very early stage.It is proposed that nanocrystallization may al so lead to an increase of oxidation rate at the very early stage for oxidation o f any multi-element alloy,and it is by this mechanism that nanocrystallization p romotes the selective oxidation of alloys.
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