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CuSn plating

I have heard that some platers plate Pd over CuSn to replace Pd over Ni, so to prevent Cu diffusion in brass plating. For the Pd/Cusn combination, the plating can crack easily, and a buffer layer between the two layers might be needed, but what is that buffer layer made of?

WY Wong
- Hong Kong
2000

Cobalt plating can be used in place of Nickel plating. No CuSn is required when Cobalt plating is used.

Deville Yiu
Sun Lick, Hong Kong, China - Hong Kong
2000

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