USE OF PREFORMED REACTION PRODUCTS FROM CATECHOL COMPOUNDS AND FUNCTIONALIZED CO-REACTAND COMPOUNDS TO REDUCE THE OXIDATION OF BARE METAL SURFACES
Patent Information
- Application Number
- DE602017086758
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2016-12-22
- Filing Date
- 2017-12-22
- Publication Date
- 2024-12-11
- Estimated Expiration
- 2037-12-22
AI Technical Summary
Bare metal surfaces are prone to oxidation or flash-rusting during the rinsing process in conversion coating applications, leading to poor appearance and reduced corrosion resistance, with existing solutions like sodium nitrite being environmentally restricted and not universally applicable.
A method involving preformed reaction products of catechol compounds and co-reactant compounds, which are stored and then applied to the metal surface to form a passivating barrier layer, reducing oxidation and enhancing corrosion resistance and paint adhesion.
The preformed catechol compound/co-reactant compound reaction products effectively prevent or inhibit flash-rusting, even with long dwell times or elevated temperatures, and reduce the risk of E-coat appearance defects, while also controlling the deposition of subsequent conversion coatings.