No passwords, no registration, no paywalls, no popups, no AI

As an Amazon Associate & eBay Partner we earn from affil links

finishing.com -- The Home Page of the Finishing Industry

Search our quarter-million Q&As

Home of the finishing HOTLINE since 1989

-----

Solder of tin plating over copper or brass

Dear ALL,

I had my copper pins Tin plated and put them on PCB then re-flow. Sometimes these pins cannot be soldered well to the PCB and I believe the combination ratio of Tin and Lead should be a main effect for this matter. Could someone give me an idea to improve this issue? By the way, I used 90% of Tin and 10% of Lead to plate these pins and the solder that I put on the PCB is 63% of Tin and 37% of Lead, can different combinations of Tin and Lead alloy melt together?

Best regards,

Su Chen-Chen
- Taipei, China

Find a 'phase diagram' for Lead-Tin alloys. Su. It should be in almost any metallurgy book. There you will see that the melting point depends on the alloy, and a 60-40 melts at a lower temperature than a 90-10. Best of luck.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.

Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.

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: