ANISALDEHYDE AS INHIBITOR FOR THE CORROSION OF ALUMINIUM IN ACIDIC ENVIRONMENT
2023
Husaini, Musa | Tukur, Kabir | Bashir, Al’amin | Usman, Usman Sabiu
The potential inhibition effect of anisaldehyde on the aluminium corrosion in H3PO4 solution was studied through loss of weight measurement and characterization was done by FTIR and SEM analysis. The anisaldehyde shows an excellent inhibition action and served as an alternative to existing inorganic toxic inhibitors. The inhibitor concentration effect was studied at temperature range of 308 - 318 K and the result showed that inhibition efficiency increase with rise in the inhibitor concentration and retard with temperature increment. The activation energy value in blank acid solution was 32.61 kJ/mol which reached 48.22 kJ/mol with the addition of 0.1 M inhibitor concentration. The enthalpy of adsorption values were found to be positive that prove the endothermic behavior of the reaction. The entropy values were negative and that suggests an involvement of association adsorption process rather than dissociation mechanism, which also leads to ordered activation complex formation between the adsorbent and adsorbate. Gibbs free energy of adsorption (ΔGads) values were negative, thus reflect the spontaneity of the whole process. The adsorption equilibrium constant (Kads) values retards with rises in temperature as a result of the destabilization of inhibitor from the surface of aluminum. The inhibitor adsorption behavior was accurately described by Langmuir adsorption isotherm model.
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