-- The Home Page of the Finishing Industry
23+ years of serious education, promoting Aloha,
& the most fun you can have in metal finishing smiley
    no popups, no spam
on this site
current topics
topic 6742

Electroless Nickel & Immersion Gold for Ultrasonic Wire Bonding


(I attached a file which have three pictures of plated surface. These pictures were taken from quality samples which have enough ductility to endure ultrasonic shock.)


Dear Adviser,

Our company is manufacturing flexible PCB. We have some problem with crack on the pad (*plated with Electroless Nickel & Immersion Gold) which is connected with gold wire by ultrasonic bonding. Therefore we have looked for proper plating chemicals which can make surface endure Ultrasonic wire bonding shock.

( * The thickness of electroless nickel layer should be 5 to 8 µ and the thickness of gold layer should be about 0.15 µ)

I think that electroless nickel layer should have ductility or fine grains in order to endure ultrasonic bonding shock.

If you have any idea or information with regard to ductility and ultrasonic bondability of electroless nickel plating & immersion gold ,please help us.

Thanks & regards.

Hyun Soo Park
Gunpo-Shi ,Kyeonggi-Do, Republic of Korea


Dear Mr. Park,

Can you provide photos of the cracked pad?

The surface is fairly smooth, I would be more concerned about the ductility and elongation of the electroless nickel, which could be tested by some standard method (ASTM, perhaps?)

pooky tom pullizi signature
Tom Pullizzi
Falls Township, Pennsylvania

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to 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.