The second conversion coating - final finishing black passivates with trivalent chromium based post-dip solutions

摘要

The development of a trivalent chromium-based post-dip solution has been demonstrated. The post-dip solution does not act like a sealer but reinforcesrnthe trivalent-chromium based conversion coating with a μ-phosphate-bridged chromium(III) layer, bearing a similar constitution like the passivate layer.