Electropedopisition and characterization the SnZn alloy on glass carbon / EletrodeposiÃÃo e caracterizaÃÃo de Ligas SnZn sobre carbono vÃtreo
AUTOR(ES)
Sanderlir Silva Dias
DATA DE PUBLICAÇÃO
2006
RESUMO
Eutectic SnPb solder alloys have widely been used in the assembly of modern electronic devices. However, because lead and its compounds are known to be toxic to the human body and cause serious environmental problems. A substitute weld would be a alloy binary SnZn, theme of study of this work. The voltammetry results suggest that SnZn in both electroplated and formed in an eutetic way. According to the hydrodynamics experiments, only tin has a difusional control. The SnZn alloy has a coulomb efficiency of electrodeposition around 46%, where 82% of this efficiency are related to tin process. Moreover, about 60% of the charge of tin is simultaneously deposited in the same region of deposition the zinc. When concentration of Sn2+ is different of concentration of Zn2+, the efficiency of the process of deposition/dissolution presented one decreases. There was also decrease not only when the tartaric acid in substituted by citric acid/ sodium citrate but also when the two complexants were added simultaneously. This occurs probably due to strong hydrogen evolution facilitates in these systems. Deposits formed in potenciostatic condition in different inversion potentials favor the zinc deposition. Using dispersive energy of rays-X, the atomic percentage of the constituent of the league was determined, and specters suggest that eletrodeposits obey the composition of the bath. The micrographies obtained for scanned electronic micrography for individual metals allow to visualizate of nodular and needles crystals for the tin, and only nodular crystals for the zinc deposits. The micrographs for the different electroplated materials alloy to visualize of crystals nodular and uniform coating. A comparative study using the electrochemical techniques Linear Sweep Voltammetry, Chronoamperometry and Inductively Coupled Plasma Optical Emission Spectroscopy (ICPOES), for tin determination was performed. The tin taxes determined for both methods are close, presenting small variations, where the errors are randomically.
ASSUNTO(S)
snzn eletrodeposiÃÃo quimica icp-oes. complexantes electropedopisition, snzn, complexants, icp-oes
ACESSO AO ARTIGO
http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1440Documentos Relacionados
- EletrodeposiÃÃo de chumbo sobre Carbono VÃtreo, em sistema Ãcido, Alcalino e com a influÃncia do Etileno Glicol
- PreparaÃÃo e caracterizaÃÃo de filmes de urÃnio obtidos por eletrodeposiÃÃo e usados em medidas por espectroscopia alfa.
- EletrodeposiÃÃo, CaracterizaÃÃo e Estudos de CorrosÃo de Revestimentos de Ni-Mo e Ni-W
- DeterminaÃÃo de parÃmetros de fabricaÃÃo de carbono vÃtreo por meio da anÃlise estatÃstica de Weibull.
- Estudos da nucleaÃÃo e crescimento de filmes finos de diamante-CVD dopados com boro sobre carbono vÃtreo para eletrodos de alto desempenho.