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Electrochemical Investigation of Myclobutanil as Corrosion Inhibitor for Copper in Acid Medium

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Abstract:

This paper is mainly to discuss that myclobutanil as corrosion inhibitor and its corrosion efficiency were evaluated via electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The potentiodynamic polarization measurements showed that the inhibition efficiency increases sharply with the increasing of concentration of myclobutanil, and the highest inhibition efficiency of the myclobutanil reached 84.3% at 3.2×10-4 mol/L in 1 mol/L HCl. The result also indicated that myclobutanil belongs to the mixed type inhibitor. The results obtained from EIS measurements are in good agreement with that obtained from potentiodynamic polarization.

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Periodical:

Advanced Materials Research (Volumes 960-961)

Pages:

229-233

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.960-961.229

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Cite this paper

Online since:

June 2014

Authors:

Li Zheng, Ji Liu, Zhi Hua Tao, Wei He, Ding Jun Xiao, Ze Tan

Keywords:

Acid Solutions, Copper, Inhibition Efficiency, Polarization Curve

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References

[2] myclobutanil belongs to mixed type inhibitor. The corrosion efficiency is calculated by the following formula [3]. icoor(inh) means the current density in the absence of myclobutanil. Fig. 2. Potentiodynamic polarization curves of copper in 1mol/L HCl solution with different concentrations of myclobutanil Table1 Potentiodynamic polarization parameters of copper in 1mol/L HCl solution with different concentrations of myclobutanil Concentration (mol/L) Ecorr (mV SCE) Icorr (μAcm-2) bc (mVdec-1) ba (mVdec-1) IE% blank -222.

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[75] 9 Electrochemical impedance spectroscope Fig. 3 shows the Nyquist diagram of copper electrode in the solution containing different concentrations of myclobutanil at 293K. Compared with the blank solution, the curves of the Nyquist diagrams with the myclobutanil shifted obviously and the impedance arc diameter get enlargement with increasing the concentration of myclobutanil. Fig. 4 shows the equivalent circuit of the electrochemical impedance spectroscopy.  Rs represents the resistance of the solution, Rct is the charge transfer resistance, Rf stands for the film resistor, Cdl and Cf are double layer capacitance and film capacitor, respectively. W is the Warburg impedance which is caused by the diffusion of water soluble substances. Each element's data is in Table 2. The inhibition efficiency IE% with myclobutanil in different concentration is calculated by the following formula [4]: Fig. 3. Nyquist diagrams for copper in 1mol/L HCl solution with different concentrations of myclobutanil Fig. 2. Equivalent circuit model used to fit the EIS experiment data Table 2 Impedance parameters of copper in 1mol/L HCl solution with different concentrations of inhibitor at 293 K. Concentration (mol/L) Rs (Ωcm2) Rct (Ωcm2) Rf (Ωcm2) Cdl (μF/cm2) Cf (μF/cm2) W×1000 (S s0. 5cm-2) IE% Blank.

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