Next Article in Journal
The Dispersion Tolerance of Micro/Nano Particle in Polydimethylsiloxane and Its Influence on the Properties of Fouling Release Coatings Based on Polydimethylsiloxane
Next Article in Special Issue
Emerging Corrosion Inhibitors for Interfacial Coating
Previous Article in Journal
Preparation of Hydroxyapatite/Tannic Acid Coating to Enhance the Corrosion Resistance and Cytocompatibility of AZ31 Magnesium Alloys
Previous Article in Special Issue
Corrosion Protection of Steel by Epoxy-Organoclay Nanocomposite Coatings
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessArticle
Coatings 2017, 7(7), 106; https://doi.org/10.3390/coatings7070106

Particle Characterisation and Depletion of Li2CO3 Inhibitor in a Polyurethane Coating

1
CSIRO Minerals Resources Flagship, Clayton, Victoria 3169, Australia
2
Institute for Frontier Materials, Deakin University, Waurn Ponds, Geelong, Victoria 3216, Australia
3
Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands
4
AkzoNobel Specialty Coatings, Rijksstraatweg 31, 2171 AJ Sassenheim, The Netherlands
5
Department of Materials and Chemistry, Research Group Electrochemical and Surface Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
*
Author to whom correspondence should be addressed.
Received: 30 May 2017 / Revised: 3 July 2017 / Accepted: 14 July 2017 / Published: 21 July 2017
(This article belongs to the Special Issue New Generation Coatings for Metals)
Full-Text   |   PDF [24128 KB, uploaded 21 July 2017]   |  

Abstract

The distribution and chemical composition of inorganic components of a corrosion-inhibiting primer based on polyurethane is determined using a range of characterisation techniques. The primer consists of a Li2CO3 inhibitor phase, along with other inorganic phases including TiO2, BaSO4 and Mg-(hydr)oxide. The characterisation techniques included particle induced X-ray and γ-ray emission spectroscopies (PIXE and PIGE, respectively) on a nuclear microprobe, as well as SEM/EDS hyperspectral mapping. Of the techniques used, only PIGE was able to directly map the Li distribution, although the distribution of Li2CO3 particles could be inferred from SEM through using backscatter contrast and EDS. Characterisation was also performed on a primer coating that had undergone leaching in a neutral salt spray test for 500 h. Overall, it was found that Li2CO3 leaching resulted in a uniform depletion zone near the surface, but also much deeper local depletion, which is thought to be due to the dissolution of clusters of Li2CO3 particles that were connected to the external surface/electrolyte interface. View Full-Text
Keywords: primer; Li-inhibited; AA2024; polyurethane; SEM; EDS; PIXE; PIGE; leaching; pigments primer; Li-inhibited; AA2024; polyurethane; SEM; EDS; PIXE; PIGE; leaching; pigments
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Hughes, A.; Laird, J.; Ryan, C.; Visser, P.; Terryn, H.; Mol, A. Particle Characterisation and Depletion of Li2CO3 Inhibitor in a Polyurethane Coating. Coatings 2017, 7, 106.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Coatings EISSN 2079-6412 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top