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topic 10430

Adhesion test for silver plate


What is a fair adhesion test for silver plate over nickel flash over aluminum base material. The part is a large intricate housing used in cellular towers. We are trying bake tests but are getting conflicting suggestions for time and temperature. Is there a standard in the plating industry? Plating integrity is critical so we must test each housing 100% at this time.

Rob McCulley
- Salisbury, Maryland, USA


I would use an aluminum coupon of the same alloy as the box. Run a coupon with each box, bend the coupon back and forth over itself until it breaks, use a pen knife to scrap at the broken edge, you should have NO peeling away from that edge, even when viewed with a 15X loupe.

Also, don't nickel flash, put 2-4 tenths of a mil of nickel under the silver.

Also make sure you correlate the coupon adhesion with it's related box so you know that if the coupon is good, so is the box.

tom pullizzi monitor
Tom Pullizzi
Falls Township,

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