ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY STUDY OF CORROSION INHIBITION OF MODIFIED LIGNOSULPHONATE FOR CARBON STEEL
来源期刊：Acta Metallurgica Sinica2005年第4期
论文作者：D.J. Yang H.M. Lou C.H. Yi X.Q. Qiu
Key words：electrochemical impedance spectroscopy(EIS); corrosion inhibition; modified lignosulphonate;
Abstract: The corrosion inhibition for carbon steel in circulating cooling water by modified lignosulphonate has been investigated using electrochemical impedance spectroscopy technique. Results show that the inhibition efficiency of modified lignosulphonate GCL2 is a great improvement on that of lignosulphonate. The maximum inhibition efficiency of GCL2 reaches 99.21% at forming adsorption film on the metal surface for the electrochemical impedance spectroscopy in GCL2 solution shows more than one time-constant. Moreover, results also indicate that it is more efficient in stirring solution than in still solution for GCL2 because the constant of adsorption in stirring solution is much larger than that in still solution. The adsorption of inhibitor GCL2 follows Langmuir's adsorption isotherm.
D.J. Yang1，H.M. Lou1，C.H. Yi1，X.Q. Qiu1
(1.College of Chemical and Energy Engineering, South China University of Technology,Guangzhou 510640, China)
Abstract:The corrosion inhibition for carbon steel in circulating cooling water by modified lignosulphonate has been investigated using electrochemical impedance spectroscopy technique. Results show that the inhibition efficiency of modified lignosulphonate GCL2 is a great improvement on that of lignosulphonate. The maximum inhibition efficiency of GCL2 reaches 99.21% at forming adsorption film on the metal surface for the electrochemical impedance spectroscopy in GCL2 solution shows more than one time-constant. Moreover, results also indicate that it is more efficient in stirring solution than in still solution for GCL2 because the constant of adsorption in stirring solution is much larger than that in still solution. The adsorption of inhibitor GCL2 follows Langmuir''s adsorption isotherm.
Key words:electrochemical impedance spectroscopy(EIS); corrosion inhibition; modified lignosulphonate;
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