Invention Grant
- Patent Title: Corrosion inhibitor-incorporated layered double hydroxide and sol-gel coating compositions and related processes
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Application No.: US15231668Application Date: 2016-08-08
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Publication No.: US10246594B2Publication Date: 2019-04-02
- Inventor: Vijaykumar S. Ijeri , Om Prakash , Stephen P. Gaydos , Raghavan Subasri , Kalidindi Ramachandra Soma Raju , Dendi Sreenivas Reddy
- Applicant: The Boeing Company
- Applicant Address: US IL Chicago
- Assignee: The Boeing Company
- Current Assignee: The Boeing Company
- Current Assignee Address: US IL Chicago
- Agency: Haynes and Boone, LLP
- Main IPC: C08G63/02
- IPC: C08G63/02 ; C09D5/10 ; B05D3/06 ; C23F11/06 ; C23F11/173 ; C23C18/12 ; C23C22/66 ; C23C22/68 ; C23C22/83

Abstract:
A corrosion-resistant coating on an aluminum-containing substrate such as an aluminum substrate, an aluminum alloy substrate (e.g., AA 2024, AA 6061, or AA7075), or other aluminum-containing substrate includes a corrosion inhibitor-incorporated Zn—Al layered double hydroxide (LDH) layer and a sol-gel layer. A zinc salt and a corrosion inhibitor (e.g., a salt of an oxyanion of a transition metal such as a vanadate) is dissolved to form a zinc-corrosion inhibitor solution, and the substrate is immersed in or otherwise contacted with the solution to form the corrosion inhibitor-incorporated Zn—Al LDH layer on the substrate. A sol-gel composition is applied on the corrosion inhibitor-incorporated Zn—Al LDH layer of the substrate to form a sol-gel layer, and the sol-gel layer is cured.
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