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Lab Reveals Corrosion Protection Discovery

Thursday, May 11, 2017

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Researchers in Germany have revealed what they say is a newly developed form of zinc-phosphate particles for anti-corrosion coatings that will better protect steel substrates as a result of their shape.

The scientists, at INM-Leibniz Institute for New Materials, say the newly developed particles take the form of flake-like shapes, about 10 times as long as they are thick. The shape and structure of the particles result in a number of properties that the researchers say make them more ideal for corrosion protection than traditional spherical zinc-phopshate particles.

More Soluble, Better Protection

The flakes are more soluble than their spherical counterparts, for one. “Now, more phosphate-ions are soluted and repassivation of bare metal surface, for example as a consequence of a mechanical damage, is better and faster,” Carsten Becker-Willinger, the head of INM’s Nanomers program, says.

Zinc Phosphate coating
Ollmann

The shape and structure of the newly developed zinc-phosphate "flakes" make them more ideal for corrosion protection than traditional spherical zinc-phopshate particles, researchers say.

Furthermore, the actual corrosion protection offered by coatings formulated with the flakes appears to be greater and longer-lasting, according to the scientists.

“In first test coatings, we were also able to demonstrate that the flake-type particles are deposited in layers on top of each other, thus creating a wall-like structure,” Becker-Willinger said. “This means that the penetration of gas molecules through the protective coating is longer because they have to find their way through the ‘cracks in the wall.’”

Experimental results were positive, the researchers say. Testing of flake- and spherical-phosphate-coated steel plates in an electrolyte bath showed that the flakes protected against corrosion for much longer: at least three days, as opposed to the spherical particles, which protected for only a few hours.

INM’s Nanomers program is dedicated to developing protective coatings based on polymer-matrix composites.

   

Tagged categories: Asia Pacific; Coating chemistry; Coating Materials; Corrosion; Corrosion control coatings; Corrosion protection; EMEA (Europe, Middle East and Africa); Latin America; North America; Research; Research and development; Zinc Phosphate

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