Zinc nickel plating for a major European automotive OEM

Services: Zinc Nickel Plating

End User

Major European Automotive OEM

Component Description

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. This is why 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.

Coating Requirement

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.

Solution Supplied

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.