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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
Corrosion Science, Volume: 198, Start page: 110111
Swansea University Authors: Chris Griffiths, Natalie Wint, Geraint Williams , Hamilton McMurray
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DOI (Published version): 10.1016/j.corsci.2022.110111
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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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.
A: metal coatings; organic coatings; zinc; C: atmospheric corrosion; paint coatings; polymer coatings
Faculty of Science and Engineering
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).