Columbia Chemical Receives GMW 4700 Type B, BL Approval

Columbia Chemical’s black all trivalent passivating conversion coating for electroplated zinc nickel alloy is now part of GM’s limited list of approved finishers for zinc nickel.

Related Topics:

Related Suppliers

Columbia Chemical, a Brunswick, OH-based manufacturers of zinc and zinc alloy plating additives, has been granted zinc nickel approval by General Motors for Trivecta NI-Z Black 70 with Trivecta Black Sealer 350 under the GMW 4700 Type B, BL specification.

Columbia Chemical’s black all trivalent passivating conversion coating for electroplated zinc nickel alloy is now part of GM’s limited list of approved finishers for zinc nickel. NI-Z BLACK 70 with Trivecta Black Sealer 350 meets all of the GMW 4700 TYPE B, BL specification minimum requirements including 240 hours to white corrosion, 1,000 hours to red corrosion and 61 cycles of the cyclic test.

Editor Pick

Combining 3D Printing and Electroplating for Replicable Experimentation

Andreas Osterwalder calls his office a museum: what looks like a collection of small machines are 3D printed and partially electroplated parts that the scientist has been creating for his experiments.