We present an approach towards an accurate and time-efficient adsorption isotherm determination to evaluate the corrosion inhibitor interaction in electrolytic environments. The approach is based on dynamic impedance spectroscopy measurements in galvanostatic mode (g-DEIS). The studied corrosion inhibitor is continuously injected between the secondary cell and the corrosion cell. The efficiency corresponding to instantaneous inhibitor concentration is determined based on the charge transfer resistance. The galvanostatic mode ensures lack of artificial polarization component resulting from alteration of the corrosion potential by studied inhibitor. Analysis of the double-layer capacitance course of changes delivers information on the inhibitor concentration sufficient to form monolayer of the inhibitor, representing boundary conditions for Langmuir adsorption model validity. Its utility was confirmed using ellipsometry while the g-DEIS studies were cross-verified by other electrochemical tools (potentiodynamic polarization, EIS) as well as XPS and microscopic analyses. The discussed approach was first used to investigate the corrosion inhibition efficiency of various carboxylic acids towards aluminium alloys in alkaline environments, although more recently it was tested to evaluate the efficiency of complex inhibitor extracts, such as bee pollen inhibition efficiency.
Authors
Additional information
- Category
- Aktywność konferencyjna
- Type
- publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
- Language
- angielski
- Publication year
- 2019
