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Benefits of using zinc-rich primers in offshore environments

Picture for Benefits of using zinc-rich primers in offshore environments
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The nature and rate of corrosion of a metal depend upon –among other factors- the corrosivity of the environment to which it is exposed. The corrosivity category is a technical characteristic that provides a basis for the selection of materials and protective measures in different environments subject to the demands of the specific application, particularly concerning service life. Data on the corrosivity of the atmosphere is essential for the development and specification of optimized corrosion protection for manufactured products.

Product Number: 51323-18932-SG
Author: Alex Yagüe Marrón
Publication Date: 2023
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$20.00
$20.00

Offshore structures are exposed to severe corrosion stresses during their service life. High-performance coatings are required to provide long-term protection of these structures and reduce the risk of failures and maintenance costs.
Traditionally, zinc-rich primers -both organic and inorganic- have been the preferred primer of these systems since the galvanic effect provides outstanding anticorrosive protection of steel. However, systems without zinc primers are being recommended more frequently for offshore environments due to -generally- a lower cost of the paint. Although these systems may fulfill the anticorrosive requirements of standards such as ISO 12944-9, their performance is not comparable with zinc-rich systems, reducing the life cycle of the structure and increasing the maintenance costs during operation.
Different coatings systems with and without a zinc-rich primer have been exposed to real offshore conditions for 6 and 12 months.
This paper will demonstrate that zinc-rich primers are still the best choice to provide extended protection to structures located in offshore environments. The results obtained in real-life conditions show that the corrosion protection of systems with a zinc-rich primer is significantly better than those without.


Offshore structures are exposed to severe corrosion stresses during their service life. High-performance coatings are required to provide long-term protection of these structures and reduce the risk of failures and maintenance costs.
Traditionally, zinc-rich primers -both organic and inorganic- have been the preferred primer of these systems since the galvanic effect provides outstanding anticorrosive protection of steel. However, systems without zinc primers are being recommended more frequently for offshore environments due to -generally- a lower cost of the paint. Although these systems may fulfill the anticorrosive requirements of standards such as ISO 12944-9, their performance is not comparable with zinc-rich systems, reducing the life cycle of the structure and increasing the maintenance costs during operation.
Different coatings systems with and without a zinc-rich primer have been exposed to real offshore conditions for 6 and 12 months.
This paper will demonstrate that zinc-rich primers are still the best choice to provide extended protection to structures located in offshore environments. The results obtained in real-life conditions show that the corrosion protection of systems with a zinc-rich primer is significantly better than those without.


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