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Synthesis of Zn x Mg y Al 2 O 4 spinels for use in protective coatings

Synthesis of Zn x Mg y Al 2 O 4 spinels for use in protective coatings Purpose – The purpose of this paper is to describe the process of synthesizing lamellarly‐shaped anticorrosion pigments having a chemically active layer whose core consists of metal aluminium on which a thin spinel film is synthesised. Design/methodology/approach – Anticorrosion pigments were synthesised by reaction of metal aluminium lamellar particles whose surface was oxidised to Al 2 O 3 during the first stage and by subsequent reaction with ZnO and/or MgO at 800‐1,150°C producing a thin spinel layer that is chemically bonded to the metal core of the pigment particles. Core‐shell pigments including MgAl 2 O 4 /Al, Mg 0.8 Zn 0.2 Al 2 O 4 /Al, Mg 0.6 Zn 0.4 Al 2 O 4 /Al, Mg 0.4 Zn 0.6 Al 2 O 4 /Al, Mg 0.2 Zn 0.8 Al 2 O 4 /Al and ZnAl 2 O 4 /Al were synthesised. The prepared pigments were characterised by means of X‐ray diffraction analysis and scanning electron microscopy. The synthesised anticorrosion pigments were used to prepare epoxy coatings that were tested upon application for their anticorrosion properties and resistance against a chemical environment. Findings – The lamellar shape of the particles, as well as good‐quality coverage with a thin spinel layer, was identified in the prepared pigments. All of the synthesised pigments exhibit good anticorrosion efficiency in epoxy coatings. Compared to lamellar kaolin and metal core of aluminium without coverage, the protective function of the synthesised pigments in coatings is demonstrably better. Practical implications – The synthesised pigments find convenient applications in coatings protecting metal bases from corrosion. Originality/value – Synthesis of a spinel layer on the metal core of aluminium is a novel method; so is the application of these substances in coatings designed for the protection of metals from corrosion. Of great benefit is the fact that the synthesised pigments are free of any substances harmful to the environment. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Pigment & Resin Technology Emerald Publishing

Synthesis of Zn x Mg y Al 2 O 4 spinels for use in protective coatings

Pigment & Resin Technology , Volume 37 (3): 10 – May 23, 2008

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Publisher
Emerald Publishing
Copyright
Copyright © 2008 Emerald Group Publishing Limited. All rights reserved.
ISSN
0369-9420
DOI
10.1108/03699420810870995
Publisher site
See Article on Publisher Site

Abstract

Purpose – The purpose of this paper is to describe the process of synthesizing lamellarly‐shaped anticorrosion pigments having a chemically active layer whose core consists of metal aluminium on which a thin spinel film is synthesised. Design/methodology/approach – Anticorrosion pigments were synthesised by reaction of metal aluminium lamellar particles whose surface was oxidised to Al 2 O 3 during the first stage and by subsequent reaction with ZnO and/or MgO at 800‐1,150°C producing a thin spinel layer that is chemically bonded to the metal core of the pigment particles. Core‐shell pigments including MgAl 2 O 4 /Al, Mg 0.8 Zn 0.2 Al 2 O 4 /Al, Mg 0.6 Zn 0.4 Al 2 O 4 /Al, Mg 0.4 Zn 0.6 Al 2 O 4 /Al, Mg 0.2 Zn 0.8 Al 2 O 4 /Al and ZnAl 2 O 4 /Al were synthesised. The prepared pigments were characterised by means of X‐ray diffraction analysis and scanning electron microscopy. The synthesised anticorrosion pigments were used to prepare epoxy coatings that were tested upon application for their anticorrosion properties and resistance against a chemical environment. Findings – The lamellar shape of the particles, as well as good‐quality coverage with a thin spinel layer, was identified in the prepared pigments. All of the synthesised pigments exhibit good anticorrosion efficiency in epoxy coatings. Compared to lamellar kaolin and metal core of aluminium without coverage, the protective function of the synthesised pigments in coatings is demonstrably better. Practical implications – The synthesised pigments find convenient applications in coatings protecting metal bases from corrosion. Originality/value – Synthesis of a spinel layer on the metal core of aluminium is a novel method; so is the application of these substances in coatings designed for the protection of metals from corrosion. Of great benefit is the fact that the synthesised pigments are free of any substances harmful to the environment.

Journal

Pigment & Resin TechnologyEmerald Publishing

Published: May 23, 2008

Keywords: Pigments; Coatings; Inhibitors; Corrosion; Chemical analysis and testing

References