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Pyridine and its derivatives as inhibitors of aluminium corrosion in chlorine solution

Pyridine and its selected derivatives (symmetric collidine and 2,5-dibrompyridine have been studied as corrosion inhibitors for high purity aluminium in a 2 M NaCl solution at 25^oC and 35^oC using d.c. polarization techniques. The investigations were carried out with a wide range of cencentration of the comounds examined (from 0.5x10^-5 M to 1x10^-3 M). The results show that the derivatives are adsorbed on aluminium according to the Freundlich isotherm. The values of the standard free energy of adsorption suggest that the adsorptive properties of the compounds under consideration approach the physical type. The polarization curves show that the compounds act as cathodic-type inhibitors.

Superpure aluminium; corrosion inhibitors; pyridine derivatives

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