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09012 Advancements in High Performance Zinc Epoxy Coatings

Picture for 09012 Advancements in High Performance Zinc Epoxy Coatings
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Product Number: 51300-09012-SG
ISBN: 09012 2009 CP
Author: Lars Thorslund Pedersen
Publication Date: 2009
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The present work investigates the use of alloyed zinc powders in zinc epoxy and zinc silicate coatings. It is found that small amounts bismuth have a dramatic effect on rust creep resistance while nickel and magnesium was not found to have any effect in the tested range. 0.5% bismuth in the zinc reduces rust creep by up to 80% after cyclic exposure according to ISO20340. With the alloyed zinc it is possible to formulate zinc epoxy coatings with rust creep below 1 mm in the test, thus achieving performance similar to what is know from zinc silicates.

KEY WORDS: Zinc pigment, Zinc-alloy, Bismuth, Corrosion Protection, Rust Creep, Zinc Silicate
The present work investigates the use of alloyed zinc powders in zinc epoxy and zinc silicate coatings. It is found that small amounts bismuth have a dramatic effect on rust creep resistance while nickel and magnesium was not found to have any effect in the tested range. 0.5% bismuth in the zinc reduces rust creep by up to 80% after cyclic exposure according to ISO20340. With the alloyed zinc it is possible to formulate zinc epoxy coatings with rust creep below 1 mm in the test, thus achieving performance similar to what is know from zinc silicates.

KEY WORDS: Zinc pigment, Zinc-alloy, Bismuth, Corrosion Protection, Rust Creep, Zinc Silicate
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