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Chementator: A new coating for steel

By Chemical Engineering |

Researchers at Pacific Northwest National Laboratory (PNNL; Richland, Wash.; edlinks.chemengonline.com/5830-537) have developed a ceramic-based coating for steel and superalloys that prevents corrosion, oxidation, carburization and sulfidization, which commonly occur in gas, liquid, steam and other environments. The low-cost, easy-to-apply material is available for licensing and research collaborations through PNNL’s operating company Battell (Columbus, Ohio; edlinks.chemengonline.com/5830-538). To make the coating, a liquid, pre-ceramic polymer is mixed with aluminum metal-flake powders to form a slurry. The slurry can be applied to the metal surface by dipping, painting or spraying. The coating is then cured at “low” temperature using a commercially available ruthenium-based catalyst, which causes the polymer to crosslink. The coated steel is then heated in air, nitrogen or argon at 700–900°C, which causes a diffusion reaction enabling the aluminum to permeate the metal to form an aluminide surface coating on the steel; the reaction layer is much stronger than an external coating because its an integral part of the steel, says PNNL scientist Chuck Henager.   Click here for a full pdf version of the…
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