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

Influence of the thickness and roughness of polyaniline coatings on corrosion protection of AA7075 aluminum alloy

Full text
Author(s):
Bandeira, Rafael Marinho ; van Drunen, Julia ; Garcia, Amanda Cristina ; Tremiliosi-Filho, Germano
Total Authors: 4
Document type: Journal article
Source: Electrochimica Acta; v. 240, p. 215-224, JUN 20 2017.
Web of Science Citations: 44
Abstract

Polyaniline coatings of various controlled thicknesses are applied to 7075-T6 aluminum alloy substrates and evaluated for their corrosion protection ability in a corrosive saline environment using electrochemical techniques. The coating thicknesses are in the range of approximately 5 to 35 pm and they increase linearly with increasing quantities of PANI solution deposited on the substrate. The relationship between the coating thickness, roughness, and hydrophilicity is examined. Coatings ranging from 12 to 23 pm in thickness have the lowest roughness values and highest contact angles with water. The PANI-coated 7075 alloy electrodes with low roughness and high contact angles show better corrosion protection properties in saline solution (3.5% NaCl), as determined by electrochemical impedance spectroscopy (EIS) and voltammetric polarization measurements. Scanning electronic microscopy (SEM) images demonstrate the homogenous surface morphology of the PANI coatings on the micrometer scale. Even after prolonged exposure to corrosive media, no cracks were found. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 12/10856-7 - Investigation of the mechanism of glycerol electro-oxidation on metallic nanoparticles
Grantee:Amanda Cristina Garcia
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/22277-4 - Development of electrochemical methods for the processing of lignocellulose biomass and the subsequent production of platform compounds and value added chemicals
Grantee:Julia Jannie van Drunen
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/03483-2 - Synthesis and characterization of polyaniline/polyvynil choride coatings and it application in the corrosion protection of metallic alloys
Grantee:Rafael Marinho Bandeira
Support type: Scholarships in Brazil - Doctorate