Extrait de : Histoire des plantes de la Guiane Françoise, rangées suivant la méthode sexuelle, avec plusieurs mémoires sur différens objets intéreffans, relatifs à la culture & au commerce de la Guiane Françoife, & une notice des plantes de l'Ifle-de-France, Tome Troisième (Planche 66)
Siècle(s) traité(s) : 18
Droits : Domaine public
Permalien : http://www.manioc.org/images/FRA110560141i1
FRA110560141i1

Éditeur(s) : HAL CCSD
Résumé : International audience
Corrosion inhibition effect of alkaloids extract from Palicourea guianensis plant (AEPG) on C38 steel in 1 M HCl medium has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The polarization studies showed that AEPG acts as mixed-type inhibitor. The electrochemical impedance spectroscopy showed that the charge transfer resistance increases and the double layer capacitance decreases on increasing plant extract concentration. The inhibition efficiency of the extract obtained from impedance and polarization measurements was in a good agreement and was found to increase with increasing concentration of the extract. Inhibition efficiency of 89% was achieved with 100 mg L-1 of AEPG at 25 °C. The obtained results showed that, the Palicourea guianensis extract could serve as an effective inhibitor for the corrosion of steel in acid media. The adsorption of AEPG obeys the Langmuir adsorption isotherm.
International journal of electrochemical science

hal-01096655
https://hal-agroparistech.archives-ouvertes.fr/hal-01096655