| Sponsor |
|
Need a Profiler Plan B?
Tired of having to share a thermal profiler across different soldering operations? Add the affordable V-M.O.L.E. 2 four-channel profiler to the mix for time-saving efficiency.
ECD
|
|
| Sponsor |
|
"Ask the Experts" Program by Circuitnet
Do you have a question or process issue in PCB assembly? The Circuitnet "Ask the Expert's" program has over 100 panel members waiting to answer your question. Submit question now.
Circuitnet Media LLC
|
|
| Ask the Experts |
|
|
June 29, 2011 - Updated
June 27, 2011 - Originally Posted
ENIG and Black Pad
We have noticed a problem on ENIG boards in our WAVE process. The problem looks similar to Black Pad. We do not know how to identify the problem, or where to begin to find a resolution to the problem. Here are some facts: - Black residue is on the vias and this on the solder side.
- Component side SMT parts do not exhibit the problem.
- Boards are processed Pb-free - SAC305, with no-clean water based flux.
- THTs will not wet after residues appear (for touch up process)
- Blowholes appear to accompany the defect but are not always present.
Hope you can help identify the problem and how to eliminate it.
G. R.
|
| Expert Panel Responses |
You likely have a sulfur contamination issue. Sulfur residues can occur when there is ineffective cleaning after the nickel plating process.
Dr. Craig D. Hillman
CEO & Managing Partner
DfR Solutions
Dr. Hillman's specialties include best practices in Design for Reliability, strategies for transitioning to Pb-free, supplier qualification, passive component technology and printed board failure mechanisms.
|
|
Submit A Comment
|
Comments are reviewed prior to posting. You must include your full name to have your comments posted. We will not post your email address.
|
Free Newsletter Subscription
Circuitnet is built for professionals who bear the responsibility of looking ahead, imagining the future, and preparing for it.
Insert Your Email Address
|
| Sponsor |
|
Prototyping to High-Speed Production
From first builds to 22,000 CPH, Manncorp pick & place machines scale with your budget, space, and output goals—so your line grows as you do. Backed by lifetime support.
Manncorp Inc.
|
|
|
