The inhibition action of some aliphatic and aromatic aldehydes on mild steel corrosion in 1 M HCl solution. Effect of the inhibitor concentration andmedium temperature

2004 
The inhibition action of formaldehyde (FA), acetaldehyde (AA), benzaldehyde (BA), and salicylaldehyde (SA) on mild steel corrosion in 1 M HCl solution was examined by the potentiostatic polarization technique, in functionof the inhibitor concentration (1x10 - 6 -1x10 - 2 M) and the medium temperature (20-50°C). Inhibition efficiency (IE) increases with the inhibitor concentration and decreases with the rise of temperature depending on the used inhibitor. The apparent activation energy, E a and the thermodynamic activation parameters of the transition state, ΔH*, ΔS*, ΔG* increase in the presence of the studied aldehydes in the same order as the inhibition efficiency: AA < SA < BA < FA. The corrosion reaction was found to be entropy-controlled.
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