Newly-designed environment-friendly zinc electroplating black passivation, no more
use of metal salt, like silver, iron and nickel, as blackening compositions. No toxic metals,
like silver, and hexavalent chromium
in passivation solution. Easy to operate, stable
solution, brightly black-colored. No use of iron salt to blackening
the plating, good corrosion resistance, could reach more than 72 hours in NSS
(neutral salt spray) test. Applicable to all
kinds of zinc electroplating.
