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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Assessment of Charge Transport Through Barrier Membranes Before Application on Materials Surfaces

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Author(s):
Jéssica Verger Nardeli [1] ; Cecílio Sadao Fugivara [2] ; Assis Vicente Benedetti [3]
Total Authors: 3
Affiliation:
[1] Universidade Estadual Paulista. Instituto de Química - Brasil
[2] Universidade Estadual Paulista. Instituto de Química - Brasil
[3] Universidade Estadual Paulista. Instituto de Química - Brasil
Total Affiliations: 3
Document type: Journal article
Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 25, 2022-09-09.
Abstract

Abstract This work aims at investigating the charge transfer resistance (RCT) of the two membranes derived from vegetable oils which are intended to protect materials against corrosion. The membranes were characterized by thickness measurement (328±1 μm and 491± 1 μm), atomic force microscopy (AFM) to estimate of roughness (<0.5 μm), Raman spectroscopy while the RCT values were evaluated by electrochemical impedance spectroscopy (EIS) in 0.1 mol/L KCl solution. EIS was used to measure the impedance at low frequency (Z0.01Hz ≅ 109 Ω cm2), RCT ≅ 109 Ω cm2 and exchange current density (i0 ≅ 10-11 Ω cm2), employing simple instrumentation. The thickness of the membrane must be considered for coherent interpretation of the impedance results. The study of electrolytes permeation in membranes is important to previously estimate the lifetime offered to a substrate over the time of immersion even before being applied to the metallic surface. The impedance measurements demonstrated that the most resistant membrane to permeation presented a RCT around 2 GΩ cm2. This EIS measurements approach enables the optimization of membrane fabrication by conveniently identifying the best formulation. (AU)

FAPESP's process: 15/10554-9 - Polyurethanes Coatings derived from vegetable oil with and without addition of corrosion inhibitors: chemical, structural and corrosion resistance.
Grantee:Jéssica Verger Nardeli
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 18/09040-9 - Evaluation of the self-healing properties of polyurethane coatings derived from vegetable oils with and without addition of corrosion inhibitors using localized electrochemical techniques and the study of chemical and structural properties.
Grantee:Jéssica Verger Nardeli
Support Opportunities: Scholarships abroad - Research Internship - Doctorate