Sol-gel coating compositions and related processes

US11091653B2 · 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 7, 2019
• Grant date: Aug 17, 2021
• Expiry date: Sep 3, 2039

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B05D2518/12
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

An alkoxysilane is contacted with water and an inorganic acid to form a first composition. A zirconium alkoxide is contacted with an organic acid to form a second composition. One or more alkoxysilanes and an organic acid are contacted with a mixture of the first and second compositions to form a sol-gel composition, to which a photoinitiator is added. The sol-gel composition has a ratio of a number of moles of silicon to a number of moles of zirconium (nSi/nZr) ranging from about 2 to about 10. The sol-gel composition is applied on a substrate (e.g., an aluminum alloy substrate) multiple times to form multiple sol-gel layers, and at least one of the sol-gel layers is cured by UV radiation. The multiple sol-gel layers are then thermally cured.