Viorel Branzoi, Florina Branzoi, Angela Stanca, Luisa Pilan<br>Evaluation of Some Corrosion Inhibitors for Industrial <br>Cooling Waters by Electrochemical Methods

Viorel Branzoi, Florina Branzoi, Angela Stanca, Luisa Pilan
Evaluation of Some Corrosion Inhibitors for Industrial
Cooling Waters by Electrochemical Methods

Abstract:

Electrochemical measurements as: corrosion potentials, voltammetry, capacitance measurements, polarization resistance were used to assess the relevant physical properties of new corrosion inhibitors. These new corrosion inhibitors were obtained by radicalic polymerization using the microwaves energy. The inhibition activity analysis of the organic compounds was made by assuming that the mechanism of inhibition by organic molecules is chemisorption and that the energetic of the corrosion process per se is unaffected by the addition of substituents on the parent compound. We presume that, these new organic polymers inhibit corrosion of carbon steel by a protective mechanism, forming insoluble iron complexes and repairing the porous oxide layers. The metallographic micrographies made before and after the potentiodynamic polarizations pointed out the evolution of the corrosion process.The addition of the organic inhibitors led in all the cases to inhibition of the corrosion rate. The corrosion parameters obtained from polarization curves and from EIS spectra are in good concordance and point out the inhibitory action of these new organic polymers. In addition to phosphonate based cooling water inhibitors are stable beyond 100oC, and resistant to oxidation but are sensitive to chlorine. Keywords: microwaves energy, radicalic polymerization, organic inhibitor, corrosion rate

Issue: 2009, Volume 60, Issue 8

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