| abstract |
process for the manufacture of a substrate provided with a chromium free and chromium free passivation vi. The present invention relates to a process for the manufacture of a substrate provided with a cobalt-free and chromium vi-free passivation by applying a first acid passivation and a second alkaline passivation containing a mobile silicate. silane-modified and / or siloxane-modified, with which improved corrosion protection is obtained, an acidic, passive composition and a passive substrate, and a device for passive application. |