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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 Orcid Logo, Hamilton McMurray

Corrosion Science, Volume: 198, Start page: 110111

Swansea University Authors: Chris Griffiths, Natalie Wint, Geraint Williams Orcid Logo, Hamilton McMurray

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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, de...

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Published in: Corrosion Science
ISSN: 0010-938X
Published: Elsevier BV 2022
Online Access: Check full text

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.
Keywords: A: metal coatings; organic coatings; zinc; C: atmospheric corrosion; paint coatings; polymer coatings
College: Faculty of Science and Engineering
Funders: Tata Steel Europe for providing samples, the M2A for supporting the project and the EPSRC for the funding for the Ph.D. studentship via an Industrial Case Award with Tata Steel Europe. (EP/L505699/1).
Start Page: 110111