Characterization of chromate conversion film on tinplate substrate by XPS and electrochemistry methods

Abstract

The chromate conversion coating formed on commercial tinplate via a cathode electrolytic dichromate treatment has been studied by X-ray photoelectron spectroscopy (XPS) and electrochemistry methods. Through the analysis of the XPS, it was shown that there existed Cr, O, and Sn in the chromate coating and the chromate film consisted mainly of Cr(OH) 3 , Cr 2 O 3 , Sn, and SnO x . The current density decreased with increasing of the electric charge. The corrosion resistance for tinplate is relative with the content of chromium in the passivation film.

Controlled preparation and characterization of supported CuCr2O4 catalysts for hydrogenolysis of highly concentrated glycerol

“…These BE peaks are assigned to lattice oxygen and OH groups, respectively. 20 Compared with the CuCr(0.5) catalyst, the Cu 2p BE shifted higher for the CuCr(4) catalyst, while an inversed tendency for the Cr 2p BE was observed, which might be due to the interaction between CuO and CuCr 2 O 4 in the CuCr(4) catalyst, as suggested by the H 2 -TPR results. Moreover, no obvious difference between the Cu 2p spectra of CuO and Mix(4) catalyst was identified, indirectly indicating that the phases of CuO and CuCr 2 O 4 were not simply mixed in the CuCr(4) catalyst.…”

Synergy of Pt Single Atom and Clusters toward Selective Glycerol Oxidation

“…The O 1s XPS spectra were collected to study the oxygen vacancies, as shown in Figure 4d. The oxygen was categorized into lattice oxygen at ∼529.7 eV and oxygen vacancies at ∼531.7 eV [17] . The oxygen vacancies over 0.2%Pt atom /CeO 2 , 1.0%Pt cluster /CeO 2 , and 0.2%Pt atom –1.0%Pt cluster /CeO 2 account for 6.2%, 4.5%, and 6.3%, respectively.…”

“…The oxygen was categorized into lattice oxygen at ~529.7 eV and oxygen vacancies at ~531.7 eV. [17] The oxygen vacancies over 0.2%Pt atom /CeO 2 , 1.0%Pt cluster /CeO 2 , and 0.2%Pt atom -1.0%Pt cluster / CeO 2 account for 6.2%, 4.5%, and 6.3%, respectively. The high content of oxygen vacancy over 0.2%Pt atom /CeO 2 leads to the facile reduction of Pt-CeO 2 to Pt-CeO x , supporting the H 2 -TPR result (Figure 4a).…”

CrOx decoration on Fe/TiO2 with tunable and stable oxygen vacancies for selective oxidation of glycerol to lactic acid

“…The O 1s region could be deconvoluted into two peaks: (1) lattice oxygen of Cr 2 O 3 at B529.7 eV, (2) surface oxygen vacancy at B531.7 eV. 33,34 The content of oxygen vacancies on the surface of the 5% Fe-Cr catalyst accounts for 9.1%. Based on the above information, the structure of 5%Fe-10%Cr/TiO 2 (600 1C) is proposed in Fig.…”