Effect of Some Analytical Organic Indicators on the Corrosion of Nickel in Carbonate Solution

 

M. Abdallah,^1,* S.M. Abdel-Waneess, ² R. Assi¹

 

¹ Chemistry Department, Faculty of Science, Banha University, Banha, Egypt

²Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt

 

Received 26 May 2008; accepted 17 February 2009

 

 

Abstract

The effect of some analytical organic indicators, e.g. methyl red, methyl orange and methyl violet, on the corrosion of nickel electrode in 0.1 M K₂CO₃ was studied using galvanostatic and potentiodynamic anodic polarization techniques. The percentage inhibition efficiency was found to increase with increasing concentration of these compounds. The inhibitive action of these compounds is due to their adsorption on the nickel surface, making a barrier to mass and charge transfer, following Freundlich isotherm. The inhibition efficiency decreases in the order: methyl red > methyl orange > methyl violet. It was found that the addition of the chloride, bromide, iodide and thiosulfate ions accelerates the pitting corrosion of nickel in 0.1 M K₂CO₃ solutions by shifting the pitting potential to more negative direction. The addition of these analytical organic compounds protects the nickel against pitting corrosion in bromide containing solution.

Keywords: methyl red, methyl orange, methyl violet, nickel, corrosion inhibitors, pitting corrosion.

 

 

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* Corresponding author. E-mail address: metwally552@hotmail.com