Synergistic Inhibition between Schiffs Bases and Sulfate Ion on Corrosion of Aluminium in Sulfuric Acid¹

T. Sethi^a, A. Chaturvedi^a, R. K. Upadhyaya, and S. P. Mathur^b

^a Department of Chemistry, Government College, Ajmer, India

^b Department of Pure and Applied Chemistry, M.D.S. University, Ajmer, India

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Received April 15, 2008

Abstract — The effect of Schiff’s bases alone and Schiff’s bases with additive Na₂SO₄ on the corrosion of aluminium in H₂SO₄ have been investigated by using weight loss method. The present study revealed that aluminium in H₂SO₄ has been more efficiently inhibited by Schiff’s bases in the presence of additive Na₂SO₄ than Schiff’s bases alone due to the synergistic effect between Schiff’s bases and Na₂SO₄. Inhibition efficiency was found maximum upto 95.02% for aluminium in H₂SO₄ by Schiff’s bases in presence of additive Na₂SO₄. The adsorption of inhibitor accords with the Langmuir adsorption isotherm. Results obtained in both the cases indicate the dependence of inhibition efficiencies on the concentration of Schiff’s bases, additive Na₂SO₄ and also on the concentration of H₂SO₄ solution. The results show the increasing trends of inhibition efficiency with the concentration.

PACS: 82.45.Qr