Additives to stop copper attack by alkaline etching agents such as ammonia and monoethanol amine (MEA)
US7211204B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2003 |
| Grant date | May 1, 2007 |
| Priority date | — |
| Expiry date | Jan 22, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2203/124
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A corrosive composition, such as an alkaline aqueous carbon dispersion, a cleaner, a cleaner conditioner, or a conditioner, comprises a corrosion inhibitor, e.g., benzotriazole. The corrosion inhibitor is present in an amount effective to reduce or stop the dissolution of metal from a metallic surface, such as a printed circuit board, in contact with the composition. A method to reduce or stop the dissolution of metal from a metallic surface in contact with a corrosive composition, and a method to stabilize or recover a corrosive composition containing metal contaminants by adding an effective amount of a corrosion inhibitor to the corrosive composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.