Outstanding inhibitive effect of colchicine on aluminium alloy 6061 corrosion

  • Mudigere Krishnegowda Pavithra Department of Chemistry, Kuvempu University, Shankaraghatta-577451, Shimoga, Karnataka
  • Thimmappa Venkatarangaiah Venkateha Department of Chemistry, Kuvempu University, Shankaraghatta-577451, Shimoga, Karnataka
  • Mudigere Krishnegowda Punith Kumar Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, Karnataka
  • Nanjanagudu Subba Rao Anantha Department of Chemistry, Kuvempu University, Shankaraghatta-577451, Shimoga, Karnataka, India
Keywords: Corrosion inhibitor, Aluminium alloy, Potentiodynamic polarization, Electrochemical impedance spectroscopy, Adsorption isotherm

Abstract

The corrosion protection ability of colchicine (CC) on Aluminium alloy 6061 (AA6061) in 3.5% NaCl medium was examined by potentiodynamic polarization, electrochemical impedance, and chronoamperometric techniques. About 99 % of protection efficiency was achieved by 2 mM concentration of CC in 3.5% NaCl solution.The adsorption of CC on AA6061 surface obeys Langmuir isotherm by following both physisorption and chemisorption mechanism. Variation in the surface morphology of inhibited and uninhibited metal samples was examined by scanning electron microscopy.

 

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Published
26-09-2015
Section
Electrochemical Science