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Resaerch Paper |
Title |
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Electrochemical investigation of corrosion inhibition of AA6063
alloy in 1M hydrochloric acid using Schiff base compounds. |
Country |
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India |
Authors |
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Sanaulla Pathapalya Fakrudeen, Lokesh H. B, Ananda Murthy H. C,
Bheema Raju V. |
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10.9790/5736-0253747 |
Abstract:The electrochemical behavior of aluminium alloy AA6063 were investigated using Schiff base
compounds namely N, N'-bis (Salicylidene)-1, 2-Diaminoethane(Salen) and N, N'-bis (3-Methoxy
Salicylidene)-1, 2 Diaminoethane (Msalen) as corrosion inhibitors in presence of 1M Hydrochloric Acid by
Potentiodynamic polarization(PDP), electrochemical impedance spectroscopy(EIS) and weight loss method.
Potentiodynamic polarization study revealed that the two Schiff bases acted as mixed type inhibitors. The
change in EIS parameters is indicative of adsorption of Schiff bases on aluminum alloys surface leading to
formation of protective layer. The weight loss study showed that the inhibition efficiency of these compounds
increases with increase in concentration and vary with solution temperature and immersion time. The
thermodynamic parameters were also calculated to investigate the mechanism of corrosion inhibition. The effect
of methoxy group on corrosion efficiency was observed from the results obtained between Salen and Msalen.
The effectiveness of these inhibitors were in the order of Msalen>Salen. The adsorption of Schiff bases on
AA6063 alloy surface in acid obeyed Langmuir adsorption isotherm. The surface characteristics of inhibited
and uninhibited alloy samples were investigated by scanning electron microscopy (SEM).
Keywords -Corrosion inhibitors, Schiff base, Electrochemical techniques, Adsorption isotherms, Aluminum
alloy.
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