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Mechanical Performance of Nano-Particles Enriched Zinc Rich Coatings

Mechanical Performance of Nano-Particles Enriched Zinc Rich Coatings
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Corrosion is a durability concern for any unprotected structural steel from its exposure environment and coatings are widely used for corrosion protection. Zinc-rich primer-based three-coat (ZRP) systems are the most widely used for structural steel, since 1980’s. However, these coating systems often require regular maintenance. So, there is always interest to develop durable novel coating systems to reduce the maintenance cost. 

Product Number: 51219-189-SG
Author: Saiada Fuadi Fancy, Md Ahsan Sabbir, Kingsley Lau
Publication Date: 2019
Industry: Coatings
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$20.00
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Corrosion is a durability concern for any unprotected structural steel from its exposure environment and coatings are widely used for corrosion protection. Zinc-rich-primer-based three-coat (ZRP) systems are the most widely used for structural steel, since 1980’s. However, these coating systems often require regular maintenance. So, there is always interest to develop durable novel coating systems to reduce the maintenance cost. The durability and long-term performance of coating systems strongly depend on its bond to the steel substrate and proper surface preparation. Nanoparticles are being considered in the development of durable coating systems due to their beneficial mechanical properties. The purpose of this study was to evaluate the mechanical performance of a nanoparticle enriched zinc rich epoxy coating (NPE-ZRP) when applied with non-ideal steel substrate surface conditions. Different levels of preexposure conditions included high humidity, surface moisture and salt contamination with improper surface cleaning. The pull-off strength test was chosen to validate mechanical performance of the coating after exposure. The wetting contact angles for different reference liquids were measured and used for the calculations of the surface free energy, which were subsequently compared to visual and pull-off testing.

Corrosion is a durability concern for any unprotected structural steel from its exposure environment and coatings are widely used for corrosion protection. Zinc-rich-primer-based three-coat (ZRP) systems are the most widely used for structural steel, since 1980’s. However, these coating systems often require regular maintenance. So, there is always interest to develop durable novel coating systems to reduce the maintenance cost. The durability and long-term performance of coating systems strongly depend on its bond to the steel substrate and proper surface preparation. Nanoparticles are being considered in the development of durable coating systems due to their beneficial mechanical properties. The purpose of this study was to evaluate the mechanical performance of a nanoparticle enriched zinc rich epoxy coating (NPE-ZRP) when applied with non-ideal steel substrate surface conditions. Different levels of preexposure conditions included high humidity, surface moisture and salt contamination with improper surface cleaning. The pull-off strength test was chosen to validate mechanical performance of the coating after exposure. The wetting contact angles for different reference liquids were measured and used for the calculations of the surface free energy, which were subsequently compared to visual and pull-off testing.

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(Coating Formulation) Can Low Zinc Epoxy Primers Work as Well as Traditional Zinc Rich Epoxy Primers

Product Number: 47-COAT_DEC21
Author: Alex Yagüe / Pinturas Hempel / David Morton
Publication Date: 2021
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Zinc-rich primers, with zinc dust loadings of 80-85% by weight in the dry film, are often the preferred primer during new construction of assets placed in environments with high atmospheric corrosivity. Coating standards such as SSPC-Paint 20 and ISO 12944 demand that zinc-rich primers contain at least 65% and 80% zinc dust by weight in the final dry film, respectively. Traditional zinc rich primers need this high zinc loading to achieve galvanic protection of steel. New technology allows us to develop zinc primers with a lower content of zinc and/or different zinc morphology than dust to provide similar or better corrosion protection to the steel.
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(Coating Formulation) Corrosion Resistance Comparison of Zinc-Rich Epoxy With Reduced Zinc Levels

Product Number: 46-COAT_DEC21
Author: Mary Roley
Publication Date: 2021
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Zinc-rich coatings have long been known to provide excellent corrosion resistance in highly corrosive environments, in general,inorganic zincs for new construction and organic zincs for maintenance. A recent trend has been toward zinc-rich coatings with reduced levels of zinc dust. An SSPC committee formed to revise SSPC Paint 29, Zinc Dust Sacrificial Primer, Performance Based, to reference performance only, removing reference to minimum zinc dust level.
Challenging the Organic “Zinc Rich” Primer Standard
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Challenging the Organic “Zinc Rich” Primer Standard

Product Number: 51220-301-SG
Author: Alex Yagüe, David Morton
Publication Date: 2020
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This paper will examine the formulation and performance of new, activated zinc epoxy primers compared to conventional zinc-rich epoxy primers. We will demonstrate comparable corrosion resistance at reduced zinc levels in the dried film (Level 3 ≥65%) and show that zinc metal levels can be reduced to as low as 31% by weight without compromising galvanic corrosion protection while improving adhesion and mechanical properties of the dry film.
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