Efficiency of some 2‐heterocarboxaldehyde‐2′‐pyridyl‐hydrazones as corrosion inhibitors for Al dissolution in HCl solution

Abstract

The efficiency of some 2‐heterocarboxaldehyde‐2′‐pyridyl‐hydrazones as inhibitors for the acid dissolution of Al was studied by mass loss, hydrogen evolution and polarization measurement techniques. The corrosion rate was measured in 2M HCI at different temperature and concentrations; maximum percentage protection (85%) was obtained at 103M for the compound containing oxygen atom. The activation energies were calculated for all the additives used. The rate constant decreases as the inhibition efficiency increases. The results show that the studied materials influencing both the cathodic and anodic process. The mechanism of inhibition was proposed on the basis of the formation of a protective monolayer by the inhibitors molecules on the metal surface according to Langmuir isotherm.

Citation

El‐Tagouri, M.M., Mostafa, M.R., Abu El‐Nader, H.M. and Abu El‐Reash, G.M. (1989), "Efficiency of some 2‐heterocarboxaldehyde‐2′‐pyridyl‐hydrazones as corrosion inhibitors for Al dissolution in HCl solution", Anti-Corrosion Methods and Materials, Vol. 36 No. 9, pp. 10-14. https://doi.org/10.1108/eb020794