| 摘要 |
The invention concerns an aqueous solution for pre-treating or after-cleaning of contact elements having a surface made of a silicon-containing copper alloy, the solution being alkaline, that is having a pH of more than 7, and containing a corrosion inhibitor. Ideally, the solution contains at least two different surfactants, which may be anionic surfactants and/or non-ionic surfactants and/or amphoteric surfactants and/or block copolymers. |
