SurTec 668 is a chromium(VI)-free blue passivation for zinc that is suitable for all zinc processes. SurTec 668 has good corrosion protection with excellent color and brilliance.
Performance Features
Liquid concentrate with slight precipitate
Trivalent blue passivation without hexavalent chromium or oxidizing agents
Contains cobalt, to improve the corrosion resistance
Produces passivation layers with intensive blue color, even at shorter application times
A hot black oxide process for steel, Black MagicTM Infusion converts outer micron of steel to black oxide passive phase for corrosion protection acting as a micro layer to hold corrosion inhibitors and oils.
