Electrochemical and X-ray photoelectron spectroscopy studies of passive film on tin in citrate buffer solution (CROSBI ID 78862)
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Podaci o odgovornosti
Šeruga, Marijan ; Metikoš-Huković, Mirjana ; Valla, Tonica ; Milun, Milorad ; Hoffschultz H. ; Wandelt, Klaus
engleski
Electrochemical and X-ray photoelectron spectroscopy studies of passive film on tin in citrate buffer solution
Passive film formation as a function of applied potential on tin in citrate buffer solution was studied by X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry. In order to avoid air oxidation and to minimize contamination of the samples, an electrochemical preparation and transfer system attached to the ultrahigh vacuum system was used. Quantitative evaluation of the electrochemical and XPS data showed the characteristic changes of the spectra in the prepassive and in the passive potential range. The prepassivation correlated with the clear presence of Sn^0, Sn^2+ and Sn^4+ species, while true passivation correlated with the presence of Sn^4+ species only, as expected on thermodynamic grounds. Three different oxygen-containing species were found in both potential ranges: oxide, hydroxide and water. The hydroxyl oxygen peaks (oxygen atoms from tin-hydroxide species) were dominant in the O ls spectra due to electrochemical conditions used (first scan) to produce samples for XPS examination.
tin ; passivity ; polarization ; X-ray photoelectron spectroscopy
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Podaci o izdanju
407 (1-2)
1996.
83-89
objavljeno
1572-6657
1873-2569
10.1016/0022-0728(95)04502-3