Sol-gel coating compositions including corrosion inhibitor-encapsulated layered metal phosphates and related processes

US11739225B2 · kind B2 · utility

Assignee

• The Boeing Company · US

Inventors

• Vijaykumar S. Ijeri · Mumbai, IN
• Om Prakash · Kanchinakote, IN
• Stephen P. Gaydos · Chesterfield, US
• Raghavan Subasri · Hyderabad, IN
• Kalidindi Ramachandra Soma Raju · Hyderabad, IN
• Dendi Sreenivas Reddy · Hyderabad, IN

Key dates

• Filing date: Aug 6, 2019
• Grant date: Aug 29, 2023
• Expiry date: Jun 29, 2042

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C2222/20
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A layered tetravalent metal phosphate composition (e.g., a layered zirconium phosphate composition) and a first corrosion inhibitor (e.g., cerium (III), a vanadate, a molybdate, a tungstate, a manganous, a manganate, a permanganate, an aluminate, a phosphonate, a thiazole, a triazole, and/or an imidazole) is dispersed in an aqueous solution and stirred to form a first solution. A precipitate of the first solution is collected and washed to form a first corrosion inhibiting material (CIM), which includes the first corrosion inhibitor intercalated in the layered tetravalent metal phosphate composition. The first CIM is added to a first sol-gel composition to form a first CIM-containing sol-gel composition. The first CIM-containing sol-gel composition is applied on a substrate to form a CIM-containing sol-gel layer, cured by UV radiation, and thermally cured to form a corrosion-resistant coating. One or more additional sol-gel composition may be applied on the substrate.