Mechanical Galvanized
Mechanical galvanizing is a process in which parts are tumbled in a drum with chemicals, zinc powder, and glass beads. During the tumbling, the beads cold-weld a uniform coating of the zinc powder onto the surface of the part. Offers superior corrosion resistance, a more uniform coating thickness, and no chance of hydrogen embrittlement as compared to electro-zinc. Post plating dichromate dip can be added for yellow mechanical zinc.
Application: Commonly used on high strength parts where hot dip galvanizing is not possible due to hydrogen embrittlement concerns. Hardened lockwashers are typically are finished with mechanical zinc and yellow dichromate.
Appearance: Dull gray.