Electrophoretic deposition of alkaline earth coatings from EDTA complexes

A novel process route combining electrophoretic deposition (EPD) and ethylene-diamine-tetra-acetic acid (EDTA) complexation has been developed and used to produce crack-free coatings of alkaline earth oxides with thickness up to 8 μm after heat treatment at 700°C. Aqueous systems were found to be un...

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Bibliographic Details
Published in:Journal of materials science 2002-09, Vol.37 (18), p.4019-4028
Main Authors: HODGSON, S. N. B, SHEN, X, SALE, F. R
Format: Article
Language:English
Subjects:
Acetic acid
Alkaline earth oxides
Anodes
Charged particles
Chemical precipitation
Coatings
Cross-disciplinary physics: materials science
rheology
Electrochemical impedance spectroscopy
Electrodeposition, electroplating
Electrophoretic deposition
Ethylenediaminetetraacetic acids
Exact sciences and technology
Heat treatment
Materials science
Methods of deposition of films and coatings
film growth and epitaxy
Migration
Physics
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Summary:A novel process route combining electrophoretic deposition (EPD) and ethylene-diamine-tetra-acetic acid (EDTA) complexation has been developed and used to produce crack-free coatings of alkaline earth oxides with thickness up to 8 μm after heat treatment at 700°C. Aqueous systems were found to be unsuitable for the EPD process due to their high conductivity and the effect of liberated gas evolved on the electrodes, and a non-aqueous based alternative formulation was developed based on methanol (solvent/carrier) and ethanediol (stabiliser) in conjunction with the EDTA complexes to allow the EPD process to be successfully used to deposit porous coatings. The coating process has been investigated by electrochemical impedance spectroscopy (EIS), and is thought to involve a combination of the migration of complexed ions in solution, their precipitation as charged colloidal particles in the vicinity of the anode, followed by their aggregation at, and adhesion to the anode surface. It is believed the process may have application for the low cost deposition of a wide range of porous coatings.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1019648731836