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. Based on the long field history and longevity of zinc-rich coatings with high zinc content, it is important to compare relative test data for systems with lower zinc content. Testing should proceed carefully and in conjunction to real world performance to ensure that accelerated laboratory testing adequately replicates field exposures. A study has been undertaken to compare the accelerated corrosion resistance of a zinc-rich epoxy with reduced levels of zinc dust, with and without specialized additives.

Three learning objectives will be addressed:

  • Brief background of zinc-rich coatings

  • Description of experimental samples and surface preparation employed in testing

  • Review and comparison of corrosion performance

Subject
Zinc dust, Test methods, Coating performance, Zinc rich coatings, Materials performance, Additives, Salt spray corrosion testing, Steel, Rust, Corrosion resistance, Zinc, Epoxies, Blistering
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2021
Association for Materials Protection and Performance (AMPP)
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