One of the more significant developments of the last 25 years in the metal finishing industry is the commercial development and application of trivalent passivates on zinc electroplate.

These developments have allowed applicators to eliminate the use of toxic hexavalent-chromate conversion coatings, thereby safeguarding the health of all involved in the handling and processing of zinc-plated parts. Further, these trivalent passivates have a substantially positive impact on the environment.

The following information addresses issues involved with producing a consistent blue-bright, thin-film passivate on electrodeposited zinc.