304不锈钢氧离子溅射的同步辐射光电子能谱原位研究I．钢中金属元素的氧化行为

利用同步辐射光电子能谱(SR-XPS)原位研究了经溅射的SUS304不锈钢中Fe、Ni、Cr合金元素与氧离子的化学反应活性差异及三种金属元素问的相互作用规律．经低能氧离子溅射后，不锈钢表面形成了一薄层氧化物膜，元素Cr和Ni分别以和NiO形式存在；铁元素的氧化产物随氧离子溅射量的增加分别以FeO、FeO和共存、全部生成的形式存在．在SUS304不锈钢中，铬元素与氧离子的化合能力最强，铁元素次之，镍元素的化合能力较弱．同纯金属与氧离子的化合行为比较发现三种金属元素合金化后，铁、铬元素与氧离子的化合能力提高，而镍元素的氧化速度降低．氧化过程中铁元素与镍元素间存在相互作用，只有当铁元素与氧离子反应生成后，镍元素才开始氧化．

THE OXIDATION BEHAVIORS OF Fe, Cr AND Ni in O2+-ION IMPLANTED SUS304 STAINLESS STEEL BY IN SITU SR-XPS I. OXIDATION BEHAVIORS

The oxidation behavior of Fe, Cr and Ni in SUS304 stainless steel implanted with 3 keV ions has been investigated by in situ synchrotron radiation X-ray pbotonelectron spectrocsopy(SR-XPS). For comparison, the same experiments were carried out for the pure Fe,Cr and Ni metals. The oxide films of stainless steel and pure metals have also been observed byscanning tunneling microscope (STM). It was found that the oxidized species of Cr and Ni in SUS304 were and NiO, respectively. For Fe, on the other hand, the oxidized product in SUS304 changed from FeO to with the increase of the doses of The oxidation rates of Fe and Cr in SUS304 were faster than those in respective pure metals, while the oxidation rate of Ni in SUS304 was lower than that in pure Ni. NiO layer was not formed on SUS304 until appeared, which suggests that has a special effect on the NiO formation. The oxidation behavior of Fe, Cr, Ni in SUS304 is discussed on the basis of the results of STM and SR-XPS.