Major European automotive OEM
This uniquely designed component with integral free moving washer is used on the aluminium wheels on a range of executive cars. Mounted in the aluminium casting it is important that no galvanic corrosion is set up – hence the designers chose zinc nickel alloy electroplating which unlike traditional zinc plating can be safely mated to aluminium. Additionally, tight tolerance is an issue with assembly being automated the torque characteristics need to be consistent.
The crucial issue is to maintain this tight tolerance when processing large volumes every day. Process control and repeatability is essential. A more unusual requirement was to maintain a predetermined dark black colour as these components are readily visible in the showroom. Moreover the coating has to achieve in excess of 720 hours salt spray performance. Tight tolerance even on the inside of the component and control of the torque characteristics were essential.
Using accurately specified barrel loadings and rectifier settings we have been able to control the coating thickness within the tight tolerances specified – even in bulk production. Naturally the coating is also RoHS and compliant, meeting end of vehicle life regulations. Finally, a torque controlling lubricant is applied.
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Zinc Nickel Plating
Conforming to all the major automotive specifications this finish provides the ultimate in corrosion resistance.
Used as an undercoat for tin, silver and nickel, as well as a finish in its own right.
We offer a barrel plating service for steel, brass and zinc diecast components.
A proprietary finish which gives stainless steel a durable black appearance.
With both bright and matt variants, we offer jig and barrel facilities.
Available with a range of passivates: clear, yellow, black and olive drab.