Journal article 78 views
The contribution of Zn(II) and phosphate anions to the inhibition of organic coating cathodic disbondment on galvanised steel by zinc phosphate pigment
Chris Griffiths,
Natalie Wint 
,
Geraint Williams ,
Hamilton McMurray
,
Geraint Williams ,
Hamilton McMurray
Corrosion Science, Volume: 198, Start page: 110111
Swansea University Authors:
Chris Griffiths, Natalie Wint , Geraint Williams , Hamilton McMurray
DOI (Published version): 10.1016/j.corsci.2022.110111
Abstract
In-situ scanning Kelvin probe (SKP) measurements are used to investigate the relative contributions of in-coating zinc (II) cations and phosphate anions to the inhibition of corrosion-driven cathodic disbondment by zinc phosphate (ZnPhos) pigments. Using hot-dip galvanized steel (HDG) substrates, de...
| Published in: | Corrosion Science |
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| ISSN: | 0010-938X |
| Published: |
Elsevier BV
2022
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa59230 |
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| Abstract: |
In-situ scanning Kelvin probe (SKP) measurements are used to investigate the relative contributions of in-coating zinc (II) cations and phosphate anions to the inhibition of corrosion-driven cathodic disbondment by zinc phosphate (ZnPhos) pigments. Using hot-dip galvanized steel (HDG) substrates, delamination rates of model polyvinylbutyral (PVB) coatings comprising different pigment volume fractions (ϕ) of phosphate-loaded hydrotalcite and Zn(II)-exchanged bentonite are compared with those established in the presence of ZnPhos. The most powerful inhibitory effect is obtained using in-coating Zn2+, while ZnPhos pigments inhibit cathodic disbondment rather weakly and as such the principal function of phosphate is to control Zn2+ solubility. |
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| Keywords: |
A: metal coatings; organic coatings; zinc; C: atmospheric corrosion; paint coatings; polymer coatings |
| College: |
College of Engineering |
| Start Page: |
110111 |