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Coating Response to Cathodic Polarization of Nanoparticle Enriched Epoxy Primer in Aqueous Solution

Coating Response to Cathodic Polarization of Nanoparticle Enriched Epoxy Primer in Aqueous Solution
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A nanoparticle enriched epoxy primer (NPE-ZRP) and conventional zinc-rich primer (ZRP) were tested to identify the benefits of nanoparticles for coating durability and corrosion mitigation. An intentional defect was introduced to the coating to expose the steel substrate. Samples were exposed to open circuit potential (OCP) and -1100 mVSCE polarization regime for 30 days in 3.5% (w/w) NaCl aqueous solution. 

Product Number: 51217-042-SG
Author: Saiada Fuadi Fancy, Md Ahsan Sabbir, Mayrén Echeverria Boán, Kingsley Lau, Dale DeFord
Publication Date: 2017
Industries: Corrosion Monitoring and Control , Coatings
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$20.00
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A nanoparticle enriched epoxy primer (NPE-ZRP) and conventional zinc-rich primer (ZRP) were tested to identify the benefits of nanoparticles for coating durability and corrosion mitigation. An intentional defect was introduced to the coating to expose the steel substrate. Samples were exposed to open circuit potential (OCP) and -1100 mVSCE polarization regime for 30 days in 3.5% (w/w) NaCl aqueous solution. Visual observation, knife adhesion test, pull-off strength test and optical microscopy were carried out. No corrosion was observed on NPE-ZRP coating during the exposure to -1100mVSCE. No coating disbondment was observed at this level of cathodic polarization. In the OCP condition, after an initial period of high zinc corrosion activity, steel corrosion was observed indicating that enhanced early consumption of the zinc at the defect sites. The visual observation of iron rust could indicate that inadequate cathodic protection of the exposed steel defect was afforded by the both zinc-rich coating primer, but relatively moderate accumulation of steel rust indicate some level of beneficial cathodic polarization. Generally similar observations were made for NPZ-ZRP and ZRP at -1100mVSCE and OCP indicating no major pitfalls by the presence of nanoparticles (within the constraints of preliminary testing here). Early indications of enhanced zinc activity and coating mechanical strength are promising. Further assessment of the influence of nanoparticles on the galvanic coupling of dispersed zinc pigments to the coating defects exposing steel and impact on the long-term durability of NPE-ZRP coating is in progress.

A nanoparticle enriched epoxy primer (NPE-ZRP) and conventional zinc-rich primer (ZRP) were tested to identify the benefits of nanoparticles for coating durability and corrosion mitigation. An intentional defect was introduced to the coating to expose the steel substrate. Samples were exposed to open circuit potential (OCP) and -1100 mVSCE polarization regime for 30 days in 3.5% (w/w) NaCl aqueous solution. Visual observation, knife adhesion test, pull-off strength test and optical microscopy were carried out. No corrosion was observed on NPE-ZRP coating during the exposure to -1100mVSCE. No coating disbondment was observed at this level of cathodic polarization. In the OCP condition, after an initial period of high zinc corrosion activity, steel corrosion was observed indicating that enhanced early consumption of the zinc at the defect sites. The visual observation of iron rust could indicate that inadequate cathodic protection of the exposed steel defect was afforded by the both zinc-rich coating primer, but relatively moderate accumulation of steel rust indicate some level of beneficial cathodic polarization. Generally similar observations were made for NPZ-ZRP and ZRP at -1100mVSCE and OCP indicating no major pitfalls by the presence of nanoparticles (within the constraints of preliminary testing here). Early indications of enhanced zinc activity and coating mechanical strength are promising. Further assessment of the influence of nanoparticles on the galvanic coupling of dispersed zinc pigments to the coating defects exposing steel and impact on the long-term durability of NPE-ZRP coating is in progress.

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