Chromate-free inorganic coating systems for hot corrosion protection of superalloy substrate

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United States of America

PATENT NO 12252628
APP PUB NO 20230340276A1
SERIAL NO

17517930

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Abstract

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Hexavalent chromium-free slurry formulations which are suitable in the production of inorganic overlay coating systems are described. The formulations provide superior hot corrosion and high-temperature oxidation protection for superalloy substrates. A basecoat slurry and topcoat slurry are provided. The basecoat slurry includes an aluminum phosphate based aqueous solution having a molar ratio of Al:P higher than about 1:3 with the incorporation of pigments of either metallic particles, or metal oxide particles, or both in combination. The topcoat slurry includes an aluminum phosphate based aqueous solution having a molar ratio of Al:P higher than about 1:3. An inorganic overlay coating formed on substrate made from the slurry formulation of present invention for hot corrosion protection on superalloy substrate against hot corrosion. Furthermore, a multilayer coating comprises a metallic bond coat and an inorganic overlay coating formed on superalloy substrate to further enhance high-temperature oxidation and hot corrosion protection.

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Patent Owner(s)

  • PRAXAIR S. T. TECHNOLOGY INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Belov, Irina Zionsville, US 16 149
Copeland, Daryl G Greenwood, US 6 38
Fitzwater, Brian D Indianapolis, US 1 0
Perpall, Mark W Indianapolis, US 3 0
Tang, Zhihong Carmel, US 13 38

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