日本金属学会誌

J. Japan Inst. Metals, Vol. 65, No. 1 (2001),
pp. 38-44

Mass Change of Nickel Fresh Surface at the Beginning of Oxidation

Masami Taguchi and Maki Watanabe

Department of Materials Science and Engineering, Faculty of Engineering and Resource Science, Akita University, Akita 010-8502

Abstract:

There are many cases when atmospheric corrosion produces serious problems-for example, in electronic equipment. In this report, Au and Ni were vacuum-evaporated to produce a thin film on a quartz oscillator and the mass changes of the fresh surfaces during introduction/evacuation of N2 and artificial air were measured by the QCM technique in order to investigate the initial oxidation details of a fresh nickel surface near room temperature. The monolayer adsorption could be achieved on a fresh Au surface when the N2 pressure reached 1.01{×}105 Pa, but the adsorbed layer was completely desorbed by evacuation of the gas. For the fresh Ni surface, the monolayer adsorption, which was formed within 10 seconds of the N2 introduction, did not disappear even if the N2 was evacuated. The mass change of the fresh Au surface during the introduction/evacuation of artificial air was substantially the same as that of N2. However, the XPS analysis revealed that a nickel compound, NiO, was formed on the fresh Ni surface very early during the introduction of artificial air. A contaminant, SO2, had a tendency to accelerate the rate of mass gain during the gas introduction, while H2O only increased the mass of the initial adsorption layer.


(Received August 31, 2000)

Keywords:

nickel, fresh surface, atmospheric corrosion, initial oxidation, QCM technique, mass change, adsorption, X-ray photoelectron spectroscopy


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