The inhibition effect of [1-(2, 4-dihydroxy-Phenyl)-3-(4-hydroxy-3-methoxyphenyl)- propenone] on the corrosion of the Aluminium in alkaline medium

The adsorption characteristics of [1-(2,4-dihydroxy– phenyl)-3-(4-hydroxy- 3-methoxy-phenyl)- propenone (DPHMPP) on the corrosion of aluminium in alkaline medium was investigated at 30°C and 50°C by weight loss and polarization measurements. The inhibition efficiency was found to increase with increasing concentration of the inhibitor. The temperature studies showed a decrease in efficiency with rise in temperature. Synergistic effect of tetrabutylammonium bromide (TBAB) increased the inhibition efficiency of DPHMPP. Gasometric measurements showed that the addition of DPHMPP to NaOH suppressed the evolution of hydrogen gas. The inhibitor was found influence both the anodic and cathodic corrosion reactions and thus acts as mixed type inhibitor. The adsorption of the inhibitor was found to obey Langmuir, El-Awady, Temkins and Flory Huggins adsorption isotherms

Author(s): 1N Santhini and 2 T Jeyaraj

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