Naslov
Corrosion inhibition on iron with propargylic alcohol in acid solutions

Autori
Gojić, Mirko ; Kosec, Ladislav

Izvornik
ISIJ International (0915-1559) 37 (1997), 7; 685-690

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

Ključne riječi
Iron; Corrosion inhibition; Propargylic alcohol; Adsorption

Sažetak
The corrosion inhibition of iron by propargylic alcohol (PA) in sulphuric acid was discussed by correlating the corrosion kinetics obtained by DC polarization measurements with surface structure obtained from AC impedance spectroscopy and IR spectroscopy. Both anodic and cathodic reactions were affected primarily by the addition of the inhibitor. Therefore PA can be appreciated as a mixed type inhibitor. The inhibition by one molecule of PA was 3. Standard free energy of adsorption, calculated at the corrosion potential Ecorr on the basis of longmuir type isotherm, was -31.2 kJ/mol. Impedance spectroscopyvealed that the inhibitor adsorption was nonuniform and led to decreased surface heterogeneity and formation of the protective surface film. IR-spectra of PA-inhibited specimens suggested that the inhibiting film formed after prolonged immersion time at Ecorr was composed of mainly fully saturated hydrocarbons. The stable species of iron carboxylate and alcoxide contributed to strong adhesion of the film to the iron surface as well as to the protective of the film.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

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