Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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2-Hydroxyacetophenone-aroyl Hydrazone Derivatives as Corrosion Inhibitors for Copper Dissolution in Nitric Acid Solution

  • A. S. Fouda ;
  • M. M. Gouda ;
  • S. I. Abd El-Rahman
  • Published : 20001100
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Abstract

The effect of 2-hydroxyacetophenone-aroyl hydrazone derivatives on the inhibition of copper corrosion in 3N nitric acid solution at 303 K was investigated by galvanostatic polarization and thermometric techniques. A significant decrease in the cor rosion rate of copper was observed in the presence of the investigated compounds. The corrosion rate was found to depend on the nature and concentrations of the inhibitors. The degree of surface coverage of the adsorbed inhibitors is determined from polarization measurements, and it was found that the results obey the Frumkin adsorption isotherm. The inhibitors acted as mixed-type inhibitors, but the cathode is more polarized. The relative inhibitive efficiency of these compounds has been explained on the basis of structure dependent electron donor properties of the inhibitors and the nature of the metal-inhibitor interaction at the surface. Also, some thermodynamic data for the adsorption process ( ΔGa* and f ) are calculated and discussed.

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References

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