Chrome Moly Alloy Steel
Zinc-nickel is an electrodeposited alloy coating selected for higher corrosion demands than conventional zinc plating while retaining a comparatively thin finish. A passivation layer and sealer or lubricated topcoat complete the system. Alloy composition, deposit thickness and post-treatment must be controlled; “zinc-nickel” alone is not a complete specification.
It can suit industrial, automotive and equipment assemblies exposed to cyclic moisture or de-icing environments, subject to project approval. Confirm compatibility with adjacent metals, fluids and the expected operating temperature.
As an electroplated process, zinc-nickel requires a documented embrittlement-control route for heat-treated fasteners. Cleaning, plating delay, relief treatment, hardness and verification should be agreed before manufacture.
Sealers and lubricants can be engineered for assembly behaviour. State the friction target and test method if torque-tension consistency is part of the design; colour or salt-spray duration alone does not define it.
Engineering note: Select the coating through the applicable fastener coating standard and project specification. Obtain approval for the full process route on high-strength bolting.