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Thursday, 19 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Smart-release pigments to inhibit corrosion

Friday, 24 February 2012

Scientists have studied the protection of the zinc surface of hot-dip galvanised (HDG) steel by coatings containing dispersions of novel CSP-based pigments under well-defined atmospheric corrosion conditions.

Corrosion inhibitor pigments were prepared from a polymer-based cation exchange resin

Source: Martina Berg - Fotolia.com

Corrosion inhibitor pigments were prepared from a polymer-based cation exchange resin

Source: Martina Berg - Fotolia.com

Scientists have studied the protection of the zinc surface of hot-dip galvanised (HDG) steel by coatings containing dispersions of novel CSP-based pigments under well-defined atmospheric corrosion conditions.

Novel calcium(II) and zinc(II)-exchanged pigments based on cross-linked sulphonated polystyrene (CSP) are used in model polymer coatings to inhibit cathodic disbondment on galvanised steel surfaces. An in situ scanning Kelvin probe (SKP) technique is used to quantify coating delamination rates as a function of pigment volume concentration after applying aqueous sodium chloride to a penetrative coating defect. Both in-coating cation types significantly retard delamination rates compared with the un-pigmented case. The performance of CSP is compared with pigments prepared from inorganic cation exchangers and shown to be less effective when incorporating Zn(II) cations, but superior when Ca(II) is present.

A paper on this study will appear in "Corrosion Science", Vol. 57, April issue.

Learn more about the study

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