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An Investigation on Corrosion Inhibition Potential of Thiourea-Zn2+Glycine System:Sulphuric Acid Corrosion on Mild Steel

M.B. Geetha1, S. Venkatesa Prabhu2, and S. Rajendran3

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Abstract:

 

In the present study, the inhibition potential of the combination of the compounds, thiourea-Zn2+- glycine on mild steel (MS) corrosion was investigated. Predetermined corrosion on MS was carried out H2SO4 at pH 4. The examinations on study was made using different gravimetric and conventional techniques including surface morphology, polarization, AC impedance SEM, AFM, UV, and fluorescence. The impedance measurements confirmed the polarization behavior of the corrosion products. In addition, the polarization profile showed that the inhibitor behaves as mixed type with more pronounced cathodic effect. The observed corrosion data indicated that the inhibition of MS corrosion due to adsorption of the inhibitor molecule on the metal surface that helps to minimize the corrosion. Form the inference, the combination of the inhibitors contained,

100 ppm of thiourea, 25 ppm of Zn2+ and 250 ppm of glycine showed very good inhibition efficiency on MS

corrosion.

 

Keywords: Corrosion Inhibition, Mild steel, H2SO4, Thiourea, Polarization, SEM, AFM.