Naslov
Impedance Spectroscopy Study of Aluminium and Al-Alloys in Acid Solution: Inhibitory Action of Nitrogen Containing Compounds

Autori
Metikoš-Huković, Mirjana ; Babić, Ranko ; Grubač, Zoran ; Brinić, Slobodan

Izvornik
Journal of Applied Electrochemistry (0021-891X) 24 (1994), 8; 772-778

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
impedance spectroscopy; aluminium; inhibition

Sažetak
The adsorption behaviour of triethanolamine (TEA) on aluminium, AlMgSi and AlZnMg alloys covered with naturally formed oxide films was investigated in 0.5 m NaCl solution, pH 1.3, by means of potentiodynamic and electrochemical impedance spectroscopy techniques. The results of polarization measurements show that in all cases the addition of TEA induces a decrease in the cathodic currents without affecting the anodic polarization behaviour, and, accordingly, TEA can be treated as a cathodic type inhibitor. The adsorption behaviour of TEA on the electrode surface follows a Frumkin isotherm with constants: a = 1.74, B = 18.41 dm3 mol-1. The results of impedance measurements presented in Nyquist plots show a high frequency capacitive loop related to the dielectric properties of the oxide film and a low-frequency inductive part which was determined by the faradaic process and attributed to the localized corrosion.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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