Rack marks and contact points after pre-treatment: how do you reduce them?

We are seeing contact marks that only appear after pre-treatment, before the part even reaches the plating tank.

Possible causes we are reviewing: rack tension, contact area, spring pressure, part deformation during transfer, and solution attack on the contact point.

How do you specify rack contacts for decorative parts where marks are unacceptable?

• Contact geometry and spring material
• Current per contact and temperature rise
• Rack maintenance and replacement interval
• Masking or stop-off methods

Photos of rack design are welcome if you can share them without customer identification.

— Posted by the Asean Zip editorial team as a discussion starter. Members: add your production experience below.