-- The Home Page of the Finishing Industry
Serious Education & the most FUN
you can have in metal finishing smiley

No popups, spam, registration or passwords
on this site
current topics
topic 9877

Pretreatment of Aluminium Micropads for Electroless Nickel Plating


I am currently plating aluminium pads on semiconductors with electroless Nickel. The pretreatment is a double dip zincate technique. The pads are about 100 µm in diameter and have a thickness of 0.8 µm AlCu0.5%. I am wandering that this pretreatment leads sometimes to a completely dissolved aluminium pad on the semiconductor. The reaction of electroless nickel cannot appear at these positions. Neighbouring pads seems to be okay.

Can this be a problem of the semiconductor or local potential differences ? Has anyone observed similar behaviour and what can I do to avoid this problem ?

Lothar Henneken
- Stuttgart, Germany


Your etching solution or zincation concentration is too high / or the etching time or zincation time too long. For your pretreatment process, I think 1 micro Al thickness is min. required. Your Al has only 0.8 micro, therefore, it is necessary to dilute the etching solution or zincation solution, or shorten the pretreatment time.

Good luck,

Yin Xiong
UTAC - Singpaore

If you have a question in mind which seems off topic, please Search the Site

ADD a Comment to THIS thread START a NEW threadView CURRENT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.