Aqueous composition for the passivation of zinc and cadmium surfaces.

摘要

An aqueous composition, fundamentally consisting of organic polymers and chromate ions for the passivation of zinc and cadmium surfaces. These are provided with a high anticorrosive resistance and the traditional colouring of conventional chromate passivation. This immersion process (self colour) does not require subsequent rinsing, thus avoiding production of chromate polluted waste effluent.