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Aldimines — Effective Corrosion Inhibitors for Mild Steel in Hydrochloric Acid Solution

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Abstract

New and effective aldimine types of corrosion inhibitors namely, N-methylidene octylamine (MOA), N-ethylidene octylamine (EOA) and N-propylidene octylamine (POA) have been synthesized. Their inhibition efficiency was investigated for the corrosion of mild steel in 1 M HCl solution by various corrosion monitoring techniques. A preliminary screening of the inhibition efficiency of the inhibitors was carried out by weight loss and gasometric studies. They were found to behave as good inhibitors in 1 M HCl solution. Potentiodynamic polarization measurements show that aldimines are mixed type inhibitors. The extent of the decrease in the hydrogen permeation current through the mild steel surface was studied by the hydrogen permeation technique and it was found that the decrease was in the order POA > EOA > MOA. Double layer capacitance and charge transfer resistance values were derived from Nyquist plots obtained from AC impedance studies. The adsorption of these compounds on mild steel from 1 M HCl solution obeys the Temkin adsorption isotherm.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Engineering, PSG College of Technology, Coimbatore, 641 004, India

    A. Subramania, N.T. Kalyana Sundaram & R. Sathiya Priya

  2. Department of Industrial chemistry, Alagappa University, Karaikudi, 630 003, India

    K. Saminathan & T. Vasudevan

  3. Central Electrochemical Research Institute, Karaikudi, 630 006, India

    V.S. Muralidharan

Authors
  1. A. Subramania
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  2. N.T. Kalyana Sundaram
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  3. R. Sathiya Priya
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  4. K. Saminathan
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  5. V.S. Muralidharan
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  6. T. Vasudevan
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Correspondence to A. Subramania.

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Subramania, A., Kalyana Sundaram, N., Sathiya Priya, R. et al. Aldimines — Effective Corrosion Inhibitors for Mild Steel in Hydrochloric Acid Solution. Journal of Applied Electrochemistry 34, 693–696 (2004). https://doi.org/10.1023/B:JACH.0000031033.73171.f4

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  • DOI: https://doi.org/10.1023/B:JACH.0000031033.73171.f4

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