Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Lead Cleaning

Matt Stump

#10854

Lead Cleaning | 24 June, 1999

I am looking for a way to clean solder off of QFP packages. I'm thinking a chemical method would be easy, as long as the chemistry doesn't attack the leads themselves, or the package. Any suggestions?

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Vic Lau

#10855

Re: Lead Cleaning | 27 June, 1999

| I am looking for a way to clean solder off of QFP packages. I'm thinking a chemical method would be easy, as long as the chemistry doesn't attack the leads themselves, or the package. | Any suggestions? | Dear Matt,

I have a customer, who is component manufacturer. They have some component lead, base metal is alloy42 coated with ~20 micron of copper, then further coated with ~10 micron of Sn/Pb. They want to remove the Sn/Pb coating. We tried some nitric acid base cleaner, Alpha Metals PC1111Z, and cleaned the component lead at ambient conditions for 2 - 3 min. From EDX and cross-section analysis, we found the Sn/Pb layer was completely removed, but not the copper layer.

Hope this information useful to you.

Vic

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John Thorup

#10856

Re: Lead Cleaning | 28 June, 1999

| | I am looking for a way to clean solder off of QFP packages. I'm thinking a chemical method would be easy, as long as the chemistry doesn't attack the leads themselves, or the package. | | Any suggestions? | | | Dear Matt, | | I have a customer, who is component manufacturer. They have some component lead, base metal is alloy42 coated with ~20 micron of copper, then further coated with ~10 micron of Sn/Pb. They want to remove the Sn/Pb coating. We tried some nitric acid base cleaner, Alpha Metals PC1111Z, and cleaned the component lead at ambient conditions for 2 - 3 min. From EDX and cross-section analysis, we found the Sn/Pb layer was completely removed, but not the copper layer. | | Hope this information useful to you. | | Vic This might be the solder stripper supplied by Alpha PC Fab in Irvine Ca. 714/757-0111|

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