Manganese-based no-rinse conversion coatings for aluminium alloys

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Synthesis of conductive polymeric composite coatings for corrosion protection applications

This study investigates and evaluates the protection offered by the combination of two intrinsically conductive polymers, polypyrrole and polyaniline, when applied onto pretreated Al2024-T3 substrates by a cyclic voltametric technique. All coatings produced in this work show homogeneity and strong adhesion to the substrate. The effect of the electrolyte concentration and potential sweep rate is investigated, while the composition of the deposited coatings is analyzed by the potentiodynamic data of the potentiodynamic curves; cyclic voltamograms acquired on the formed coatings, in monomer-free solutions. Scanning electron microscopy (SEM) images and EDAX analysis employed to characterize the morphology and composition of the formed coatings. The electrochemical behaviour of the coatings evaluated through Potentiodynamic and Open Circuit Potential (OCP) measurements. Evaluation of the performance of the formed coatings suggests an improved electrochemical behaviour when compared to the pretreated uncoated substrate. © 2010 Elsevier B.V. All rights reserved

Effect of silica nano-particles on the performance of manganese-based conversion treatments

Permanganate-based conversion treatments incorporating silica nano-particles + nitrate ions or other inhibitive additives have been examined by corrosion and adhesion tests on samples with paint and by polarisation measurements on treated, but uncoated AA 3003 panels. Although electrochemical behaviour is not improved by addition of the silica nano-particles, in many cases they substantially improve the performance of PVDF-coated samples in adhesion and accelerated corrosion tests