Extractives of the tropical wood wallaba (Eperua falcata Aubl.) as natural anti-swelling agents

Mariana Royer 1 Didier Stien 1 Jacques Beauchêne 1 Gaëtan Herbette 2 John Paul Mc Lean 3 Anne Thibaut 1 Bernard Thibaut 1
1 ECOFOG - Ecologie des forêts de Guyane
2 AMU SPEC - Spectropôle - Aix Marseille Université
3 MAB - Mécanique de l'Arbre et du Bois
LMGC - Laboratoire de Mécanique et Génie Civil
Abstract : A comparative study of 9H-pyrido[3,4-b]indole (norharmane) and 1-methyl-9H-pyrido[3,4-b]indole (harmane) as inhibitors for C38 steel corrosion in 1 M HCl solution at 25 °C was carried out. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques were applied to study the metal corrosion behavior in the absence and presence of different concentrations of these inhibitors. The OCP as a function of time were also established. Cathodic and anodic polarization curves show that norharmane and harmane are a mixed-type inhibitors. Adsorption of indole derivatives on the C38 steel surface, in 1 M HCl solution, follows the Langmuir adsorption isotherm model. The ΔGads values were calculated and discussed. The potential of zero charge (PZC) of the C38 steel in inhibited solution was studied by the EIS method, and a mechanism for the adsorption process was proposed. Raman spectroscopy confirmed that indole molecules strongly adsorbed onto the steel surface. The electronic properties of indole derivates, obtained using the AM1 semi-empirical quantum chemical approach, were correlated with their experimental efficiencies using the linear resistance model (LR).
Keywords : HPLC NMR extrac-tives Indole derivatives Corrosion Corrosion inhibitor Raman spectrometry Impedance Hydrochloric acid Corrosion protection dimensional stability Eperua falcata tropical wood
Document type :
Journal articles
Complete list of metadatas
https://hal-agroparistech.archives-ouvertes.fr/hal-01093227
Contributor : Carole Legrand <>
Submitted on : Friday, January 18, 2019 - 12:20:31 PM
Last modification on : Wednesday, May 29, 2019 - 10:04:03 AM

File

Art_McLean_al_2010.pdf
Publisher files allowed on an open archive

Identifiers

Collections

CIRAD | UNIV-MONTPELLIER | MIPS | ECOFOG | LMGC | INRA | UNIV-AMU | UNIV-AG | AGROPARISTECH

Citation

Mariana Royer, Didier Stien, Jacques Beauchêne, Gaëtan Herbette, John Paul Mc Lean, et al.. Extractives of the tropical wood wallaba (Eperua falcata Aubl.) as natural anti-swelling agents. Holzforschung, De Gruyter, 2010, 64 (2), pp.211-215. ⟨10.1515/HF.2010.034⟩. ⟨hal-01093227⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

257

Files downloads

76

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD