| Texto completo | |
| Autor(es): |
Osorio, Wislei R.
[1, 2]
;
Spinelli, Jose E.
[3]
;
Afonso, Conrado R. M.
[3]
;
Peixoto, Leandro C.
[2]
;
Garcia, Amauri
[2]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Campinas, UNICAMP, Sch Appl Sci FCA, BR-13484350 Limeira, SP - Brazil
[2] Univ Estadual Campinas, UNICAMP, Dept Mat Engn, BR-13083970 Campinas, SP - Brazil
[3] Fed Univ Sdo Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Electrochimica Acta; v. 69, p. 371-378, MAY 1 2012. |
| Citações Web of Science: | 14 |
| Resumo | |
This is a study describing the effects of microstructure features of spray-formed Al-Ni alloy powders on the electrochemical corrosion resistance. Two different spray-formed powders were produced using nitrogen (N-2) gas flow (4 and 8 bar were used). Electrochemical impedance spectroscopy (EIS), potentiodynamic anodic polarization techniques and an equivalent circuit analysis were used to evaluate the electrochemical behavior in a dilute 0.05 M NaCl solution at room temperature. It was found that a N-2 gas pressure of 8 bar resulted in a microstructure characterized by a high fraction of small powders and fine cell spacings, having improved pitting potential but higher corrosion current density when compared with the corresponding results of a coarser microstructure array obtained under a lower pressure. A favorable effect in terms of current density and oxide protective film formation was shown to be associated with the coarser microstructure, however, its pitting potential was found to be lower than that of the finer microstructure. (C) 2012 Elsevier Ltd. All rights reserved. (AU) | |