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Journal of Applied Electrochemistry

, Volume 29, Issue 1, pp 123–128 | Cite as

Inhibiting effect of citric acid on the pitting corrosion of tin

  • C. M. V. B. Almeida
  • T. Rabóczkay
  • B. F. Giannetti
Article

Abstract

Potentiostatic and potentiodynamic studies were carried out to establish the inhibiting effects of citric acid on the pitting corrosion of tin. The critical potential (Ecrit), 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 pH4.0, 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 10−2m. Pitting occurrence by direct interaction between metal and perchlorate anions was observed.

tin perchlorate citric acid pitting inhibition 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • C. M. V. B. Almeida
    • 1
  • T. Rabóczkay
    • 1
  • B. F. Giannetti
    • 2
  1. 1.Instituto de Química da Universidade de São PauloSão PauloBrazil
  2. 2.Instituto de Ciências Exatas e Tecnologia da Universidade PaulistaSão PauloBrazil

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