Home
 
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
SEARCH🔍
the Site
no_pop_no_spam2

World's top finishing resource since 1989
Chime right in - No login req'd

topic 29987

Pits and dents from electroplating process of PCB



2004

I have a headache on the pits and dents problem from the electroplating process. After pattern plating and Alkaline etching, on the side of the traces there are some pits and dents on them. I would like to know the root cause and how to solve it.

Thanks,

Narakorn K [last name deleted for privacy by Editor]
PCB fabrication - Bang-Pa-In, Ayuthaya, Thailand


2004

pattern plating means build up of copper, then mostly tin-lead, or tin only to save copper circuit during etching. rough deposit in copper plating. excess current, low chloride, improper filtration. My exp. in PCB manufacturing from 1988 to 1992. We were normally supplying c.d 2 amp/dm2.

ajay raina
Ajay Raina
Ludhiana, Punjab, India


2004

That problem is typically caused by incomplete development of the image/photoresist residues.

James Totter
James Totter, CEF
- Tallahassee, Florida


2004

FOR BETTER TREATMENT WRITE PROBLEM IN DETAIL . PROCESS SEQUENCE IS NEEDED.
PTH ELECTROLESS COPPER.HIGH BUILD
RINSE
DRY
BRUSHING
PHOTO RESIST PRINTING UV EXPOSER
DEVELOPING
THEN PATTERN PLATING
MICRO ETCHING
WR
SULPHURIC ACID DIP
WR
COPPER PLATING
PROBLEM SEEMS IN YOUR DEVELOPING SOLUTION

ajay raina
Ajay Raina
Ludhiana, Punjab, India


October 27, 2009

This problem sounds like "Gas/Air bubble pitting".
I would imagine this problem is mainly on fine traces.

Ian Paterson
- London, UK


August 16, 2010

I agree that it could be caused in the developing process. I have also experienced it with fine line traces. If you are not using airless copper plating tanks I have found that vibration on the tanks significantly improved the issues I experienced with pitting especially with fine line traces.

Joe Boo
- Portland, Oregon

none
finishing.com is made possible by ...

this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start NEW Thread

Disclaimer: It's not possible to fully 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 might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA