Letter 8074

EN on NiCr  

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I am being asked to electrolessly plate Ni on a NiCr sputtered alloy. I have tried an 30% HCl dip to strip off the native oxide but the EN won't initiate. The features are small, 3 uM openings through a spun on resist pattern. I have also tried a buffered HF solution (10:1) to expose the Ni in the NiCr alloy but to no avail.

Suggestions anyone?

Patrick Franklin
Indigo Systems - Santa Barbara, CA

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Try next:

(1) Reverse etching in sulfuric acid for 60s,switch polarity and
(2) Direct etching for 30s
(3) Reverse for 30s
(4) Direct for 10s.

If you have Nickel strike, plate 2-3 min. rinse and put in EN

Reverse mean parts is connected to positive pol on rectifier

Mico
- Vancouver

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