fevereiro 2015 vol. 1 num. 2 - XX Congresso Brasileiro de Engenharia Química

Artigo - Open Access.

Idioma principal

EXAFS AND XRD STUDIES OF ‘ZN-CO’ ALLOY ELECTRODEPOSITS

CARPENTER, D. E. O. S.; CARPENTER, S. D.;

Artigo:

The sacrificial behaviour of electrodeposited zinc layer on the surface of a ferrous alloy to delay the onset of ferrous corrosion is very well documented in the literature. However zinc-cobalt alloys show a marked improvement in the corrosion protection of a ferrous substrate in comparison with pure zinc layers. A protective layer of zinc-cobalt can be applied by means of simultaneous electro-deposition. The electro-deposited structure of a zinc-cobalt alloy was studied using X-Ray Diffraction (XRD) and Extended X-ray Absorption Fine Structure (EXAFS). The morphology of the electro-deposit was found to be significantly dependant on cobalt concentration of the electrolyte. Dilute electrolytes were found to yield a single phase hexagonal close packed (hcp) deposit similar to that of the constituent metals themselves. However electro-deposits formed under the same condition from electrolytes of higher cobalt concentration were found to contain a fine dispersion of an intermetallic phase identified as ‘Co5Zn21’.

Artigo:

Palavras-chave:

DOI: 10.5151/chemeng-cobeq2014-0136-26873-182153

Referências bibliográficas
  • [1] CARPENTER, D.; CARPENTER, S. D.; FARR, J. P. G. Trans. IMF. 4, v. 78, p. 152, 2000.
  • [2] CARPENTER, D.: Ph.D. Thesis, University of Birmingham, UK, 1999.
  • [3] DESPIC, A.R.; JOVIC, V.D.; STEVANOVIC, J.S. S. Spaic, J. Electrochim. Acta. 34. p. 899, 1989.
  • [4] DREWIEN,C.A.; GOLDSTEIN, J.I.; MARDER, A.R. Metallurgical and Metallurgical Transactions. 25 A, 6-7. 1041, 1996.
  • [5] F.J.F. MIRANDA,F.J.F.; BARCIA, O.E.; Diaz, S. L.; MATTOS, O.R.; WIART, R. Electrochim. Acta. v. 41, p. 1119, 1996.
  • [6] GODARD, J.; WRIGHT, J. G.; J. Applied Phys. v.15, p. 807, 1964.
  • [7] H.L. GAIGHER, H.L.; VAN, N.G.; BERG, V.D. Electrochim. Acta. v. 21. p. 45, 1976.
  • [8] KERSTENS, Physics, v. 2, p. 274, 1932.
  • [9] SWARTHIRAJAN, S. J. Electroanal. Chem. 221. 211, 1987.
Como citar:

CARPENTER, D. E. O. S.; CARPENTER, S. D.; "EXAFS AND XRD STUDIES OF ‘ZN-CO’ ALLOY ELECTRODEPOSITS", p. 13213-13221 . In: Anais do XX Congresso Brasileiro de Engenharia Química - COBEQ 2014 [= Blucher Chemical Engineering Proceedings, v.1, n.2]. São Paulo: Blucher, 2015.
ISSN 2359-1757, DOI 10.5151/chemeng-cobeq2014-0136-26873-182153

últimos 30 dias | último ano | desde a publicação


downloads


visualizações


indexações