Investigation of the Fe-Mo electrodeposition from sorbitol alkaline bath and characterization of the films produced.
ZACARIN, Maria G.; BRITO, Matheus M.; BARBANO, Elton P.; CARLOS, Rose M.; MASTELARO, Valmor Roberto; CARLOS, Ivani A.
ZACARIN, Maria G.; BRITO, Matheus M.; BARBANO, Elton P.; CARLOS, Rose M.; MASTELARO, Valmor Roberto; CARLOS, Ivani A.
 Abstract: The electrodeposition of Fe-Mo alloys from an alkaline solution containing sorbitol as the complexing agent for Fe(III) ions was studied. XRD analysis of the film produced by reduction of [MoO4]2- anions at a copper substrate showed the formation of MoO2. The presence of the intermediate Fe(II) species was detected by electrolysis from an Fe-Mo solution and Visible spectroscopy of the final solution in the presence of 1,10-phenanthroline. The Visible spectrum showed a broad absorption (lmax ¼ 514 nm) typical of the [Fe(phen)3]2þ complex. Under our conditions, the Fe-Mo alloy was formed from reduction of [Fe(OH)2(C6H12O6)2]3- to [Fe(OH)2(C6H12O6)2]4-, reduction of [MoO4]2- to molybdenum (IV) oxide/ hydroxide and its further reduction to Mo0 concomitant with [Fe(OH)2(C6H12O6)2]4 ads to Fe0. Photomicrographs of the Fe-Mo electrodeposits produced with qd 5.30Ccm 2 showed that they were smooth or contained cracks, depending on the deposition potential (Ed). Chemical composition analysis by EDXS of Fe-Mo electrodeposits (qd 5.30Ccm 2) showed that deposits containing 5.5 at% (18.8 wt%) Mo could be produced at Ed 1.40 V and similar values were obtained at more negative potentials. X-Ray diffraction indicated that the Fe-Mo coatings were composed of Fe3Mo and Fe2MoO4 phases, regardless of Ed. The presence of the Fe2MoO4 phase on the sample surface could explain the observation of Fe2þ and Mo4þ states by XPS, although the occurrence of others crystalline oxide phases, such as FeMoO4 and Fe2(MoO4)3 could not be discarded. The crystal size value varied from ~47 nm to ~37 nm, when Ed changed to more negative values. | |
| Journal of Alloys and Compounds |
| v. 750, p. 577-586 - Ano: 2018 |
| Fator de Impacto: 3,133 |
| http:/dx.doi.org/10.1016/j.jallcom.2018.04.020 |  @article={002880500,author = {ZACARIN, Maria G.; BRITO, Matheus M.; BARBANO, Elton P.; CARLOS, Rose M.; MASTELARO, Valmor Roberto; CARLOS, Ivani A.},title={Investigation of the Fe-Mo electrodeposition from sorbitol alkaline bath and characterization of the films produced},journal={Journal of Alloys and Compounds},note={v. 750, p. 577-586},year={2018}} |
