Sol-gel coating compositions including corrosion inhibitor-encapsulated layered double hydroxide and related processes

US10793725B2 · 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: Mar 15, 2019
• Grant date: Oct 6, 2020
• Expiry date: Mar 15, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C26/00
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A Zn—Al layered double hydroxide (LDH) composition is added to a solution including a corrosion inhibitor and stirred, and a precipitate of the solution is collected, washed, and dried to form a corrosion inhibiting material (CIM), in which the LDH composition is intercalated with the corrosion inhibitor. An inorganic CIM and/or an organic CIM may be formed. The organic CIM may be added to a sol-gel composition to form an organic CIM-containing sol-gel composition, and the inorganic CIM may be added to a sol-gel composition to form an inorganic CIM-containing sol-gel composition. Further, the organic CIM-containing sol-gel composition may be applied on a substrate (e.g., an aluminum alloy substrate) to form an organic CIM-containing sol-gel layer and cured by ultraviolet (UV) radiation, the inorganic CIM-containing sol-gel composition may be applied on the substrate to form an inorganic CIM-containing sol-gel layer and cured by UV radiation, and the sol-gel layers may be thermally cured.