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Challenging the Organic “Zinc Rich” Primer Standard

Challenging the Organic “Zinc Rich” Primer Standard
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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.

Product Number: 51220-301-SG
Author: Alex Yagüe, David Morton
Publication Date: 2020
Industry: Coatings
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$20.00
$20.00

 Zinc-rich primers are often the primer of choice during new construction of assets placed offshore for oil & gas production. The SSPC-Paint 20 specification covers both inorganic (Type I) and organic (Type II) highly pigmented zinc-rich coatings and the level of zinc dust is classified by the weight of zinc in the dried film. Oil & gas specifications demand at least Level 2 (≥ 77% and less than 85%) to meet the performance demands of this specification and the harsh conditions experienced when offshore. In conventional zinc-rich epoxy primers (Type II) the high levels of zinc are achieved by adding large amounts of zinc dust particles into an epoxy matrix as a pigment. The dispersion of the zinc is crucial to ensure electrical contiguity and hence galvanic protection of steel. Formulation is critical to ensure the correct PVC/cPVC ratio to ensure both galvanic protection and adequate adhesion plus mechanical properties. 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.

 Zinc-rich primers are often the primer of choice during new construction of assets placed offshore for oil & gas production. The SSPC-Paint 20 specification covers both inorganic (Type I) and organic (Type II) highly pigmented zinc-rich coatings and the level of zinc dust is classified by the weight of zinc in the dried film. Oil & gas specifications demand at least Level 2 (≥ 77% and less than 85%) to meet the performance demands of this specification and the harsh conditions experienced when offshore. In conventional zinc-rich epoxy primers (Type II) the high levels of zinc are achieved by adding large amounts of zinc dust particles into an epoxy matrix as a pigment. The dispersion of the zinc is crucial to ensure electrical contiguity and hence galvanic protection of steel. Formulation is critical to ensure the correct PVC/cPVC ratio to ensure both galvanic protection and adequate adhesion plus mechanical properties. 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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Challenging the Performance Myth of Inorganic Zinc Rich vs Organic Zinc Rich Primers

Product Number: 51317--9127-SG
ISBN: 9127 2017 CP
Author: Jose Luna
Publication Date: 2017
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Protecting mechanisms of a new generation of activated zinc primers with enhanced protection vs inorganic zinc rich primers. Performance properties have been proven with results from different corrosion tests.
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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
$20.00

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.
Can You Use a ZInc Rich Primer When Painting Offshore?
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Can You Use a ZInc Rich Primer When Painting Offshore?

Product Number: 51220-266-SG
Author: Raquel Morales, Antoni Prieto, Pinturas Hempel, Joaquin Ferreiro, David Morton, Hempel AS
Publication Date: 2020
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Traditional zinc rich primers are the primer of choice during new construction of assets placed offshore for oil & gas production. However, during maintenance, zinc rich primers are not used because of difficulties of having good surface preparation and controlling applied dft to prevent cracking. This paper will examine the performance of new, activated zinc rich epoxy primers compared to conventional zinc rich epoxy primers on steel prepared to different surface profiles using standard techniques of today.
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