STUDIES ON THE EFFECT OF TWO SALEN SCHIFF-BASES ON THE CORROSION OF LOW ALLOY STEEL IN 1M HCL
The corrosion inhibition by two synthesized Schiff -bases of bis-(2-hydroxy-3-methoxy)-l,6-diaminohexane salicyladimine and bis- (2-hydroxy)-1,6-diaminohexane salicyladimine was investigated by weight loss, Tafel polarization and AC impedance on low alloy steel in 1M HC1. The results show that these...
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| Autores principales: | , , |
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| Lenguaje: | English |
| Publicado: |
Sociedad Chilena de Química
2010
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| Materias: | |
| Acceso en línea: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072010000300011 |
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| Sumario: | The corrosion inhibition by two synthesized Schiff -bases of bis-(2-hydroxy-3-methoxy)-l,6-diaminohexane salicyladimine and bis- (2-hydroxy)-1,6-diaminohexane salicyladimine was investigated by weight loss, Tafel polarization and AC impedance on low alloy steel in 1M HC1. The results show that these Schiff -bases act as anodic type inhibitors. The inhibition efficiency obtained from all method employed are in good agreement. Changes in impedance parameters (Rt and Cdt ) are indicative of adsorption of Schiff-bases onthe metal surface leading to the formation of protective film. Two Schiff-bases are found to adsorb on low alloy steel surface according to the Langmuir adsorption isotherm and thermodynamics calculations revealed that bis-(2-hydroxy-3-methoxy)-1,6-diaminohexane salicyladimine had larger adsorption constant and more negative free energy of adsorption than bis-(2-hydroxy)-1,6-diaminohexane salicyladimine. |
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