Inhibiting effect of citric acid on the pitting corrosion of tin
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Data
1999-01-01
Autores
Almeida, CMVB
Raboczkay, T.
Giannetti, B. F.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Kluwer Academic Publ
Resumo
Potentiostatic and potentiodynamic studies were carried out to establish the inhibiting effects of citric acid on the pitting corrosion of tin. The critical potential (E-crit), which leads to pitting or general corrosion, was determined in sodium perchlorate solution in the pH range 1.0 to 4.0. Pit nucleation and growth, at pH 4.0, can be described by instantaneous nucleation followed by progressive nucleation. The results show that the minimum acid concentration needed to inhibit pitting of tin is 10(-2) M. Pitting occurrence by direct interaction between metal and perchlorate anions was observed.
Descrição
Palavras-chave
tin, perchlorate, citric acid, pitting, inhibition
Como citar
Journal of Applied Electrochemistry. Dordrecht: Kluwer Academic Publ, v. 29, n. 1, p. 123-128, 1999.