Call For Paper Volume:4 Issue:10 Oct'2017 |

Electrochemical behavior of steel in citric acid solutions devoid of and containing some organic compounds

Publication Date : 24/08/2015



Author(s) :

Ahmed Diab , S.M. Abd El-Haleem , Azaa Abd El-Megeed , M. Elgharabawy.


Volume/Issue :
Volume 2
,
Issue 8
(08 - 2015)



Abstract :

The electrochemical behavior of steel electrode immersed in citric acid solutions has been followed and discussed using potential measurements under open-circuit conditions. The effect of increasing concentrations , temperature of solution and addition of some organic compounds are also investigated. It is found that, the steel electrode can be passivated in naturally aerated solutions of citric acid and the  rate of oxide film growth follows a direct logarithm law, as evident from the linear relationship between the open-circuit potential and the logarithm of immersion time. The rate of oxide film growth decreases  by raising the solution temperature. The addition of some organic compounds as urea, phenylhydrazine and 1,2-phenylenediamine decrease the destruction of the passive film and thus increase the inhibition process.


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Electrochemical behavior of steel in citric acid solutions devoid of and containing some organic compounds

August 18, 2015