Journal article 621 views 112 downloads
The use of anion exchange pigments to inhibit the filiform corrosion of zinc-aluminium-magnesium coated steel
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Hamilton McMurray
Corrosion Science, Volume: 193, Start page: 109886
Swansea University Authors:
Natalie Wint, Geraint Williams , Hamilton McMurray
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DOI (Published version): 10.1016/j.corsci.2021.109886
Abstract
In-coating natural (carbonate exchanged) hydrotalcite is shown to significantly reduce the extent of filiform corrosion (FFC) on Zinc-Aluminium-Magnesium (ZAM) coated steels. The hydrotalcite pigment is dispersed within the model poly vinyl butyral (PVB) coating, which is then applied to ZAM. Acetic...
| Published in: | Corrosion Science |
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| ISSN: | 0010-938X |
| Published: |
Elsevier BV
2021
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa58367 |
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| Abstract: |
In-coating natural (carbonate exchanged) hydrotalcite is shown to significantly reduce the extent of filiform corrosion (FFC) on Zinc-Aluminium-Magnesium (ZAM) coated steels. The hydrotalcite pigment is dispersed within the model poly vinyl butyral (PVB) coating, which is then applied to ZAM. Acetic acid is applied to an artificial scribe penetrative PVB coating defect to initiate corrosion. Filiform corroded area and filament length are shown to decrease with increase in pigment volume fraction (ϕ). Tapering of filaments is also observed. Findings are consistent with hydrotalcite acting to sequester anions or neutralise the filiform head electrolyte. |
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| Keywords: |
A Steel, A Magnesium, A Metal Coatings, A Organic Coatings, C Atmospheric Corrosion, C Polymer Coatings |
| College: |
Faculty of Science and Engineering |
| Start Page: |
109886 |