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Type: Artigo de periódico
Title: Determination Of The Corrosion Current Density In Low Conductivity Media: The Use Of Microelectrodes To Minimize The Ohmic Drop [determinação Da Densidade De Corrente De Corrosão Em Meios De Baixa Condutividade: Uso De Microeletrodos Para Minimizar A Queda ôhmica]
Author: De Oliveira P.C.A.
Bertazzoli R.
Abstract: The gravimetric and electrochemical tests are the most common techniques used in determining the corrosion rate. However, the use of electrochemical polarization is limited to electrolytes with sufficient conductivity for which Tafel curves are linear. In this study, we investigated a technique in which working microelectrodes of AISI 1020 steel were used to obtain the Tafel curves in diesel oil. The strategy was to reduce the electrode area and hence the ohmic drop. The diameter of the microelectrode was reduced to a value where the compensation of the Tafel curves became unnecessary. The results showed that for electrodes with diameters below 50 μm, the ohmic drop tends to a minimum and independent of the microelectrode diameter.
Rights: aberto
Identifier DOI: 10.1590/S0100-40422011000200027
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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