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A Guide to Lead-free SoldersIntroduction to Solder Alloys and Their Properties

A Guide to Lead-free Solders: Introduction to Solder Alloys and Their Properties Chapter 1 Solders remain among the most important joining materials in electronic as- sembly. This class of low melting point alloys must provide a unique set of properties to insure cost-effective production of reliable electronic assemblies, allowing joints to serve both mechanical and electrical functions. Near-eutectic SnPb alloys such as 60Sn40Pb, 63Sn37Pb and Ag-bearing 62Sn36Pb2Ag have traditionally been the most widely used solders for electronic assemblies. These alloys are used in applications ranging from consumer products to space communications systems and have been essential to the worldwide electronics industry. However, the replacement of Pb-bearing alloys is inevitable. Pb is toxic when ingested. In addition, Pb processing and reclamation may be detrimental to the environment. On the other hand, the connection between Pb use in electronics and harm to the environment remains a subject of research. Nonetheless, reduc- tion in Pb use will eventually be regulated. The European Union directives on Waste Electrical and Electronic Equipment (WEEE) dictate that products sold in the EU must be lead-free from July 1, 2006 (Nimmo 2002, Gamalski 2002). In Japan and Korea, major firms have moved forward with developing products with alternative alloys ranging from handhelds, such as calculators and minidisk players, to http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

A Guide to Lead-free SoldersIntroduction to Solder Alloys and Their Properties

Editors: Engelmaier, Werner
A Guide to Lead-free Solders — Jan 1, 2007
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Publisher
Springer London
Copyright
© Springer-Verlag London Limited 2007
ISBN
978-1-84628-309-3
Pages
1 –27
DOI
10.1007/978-1-84628-310-9_1
Publisher site
See Chapter on Publisher Site

Abstract

Chapter 1 Solders remain among the most important joining materials in electronic as- sembly. This class of low melting point alloys must provide a unique set of properties to insure cost-effective production of reliable electronic assemblies, allowing joints to serve both mechanical and electrical functions. Near-eutectic SnPb alloys such as 60Sn40Pb, 63Sn37Pb and Ag-bearing 62Sn36Pb2Ag have traditionally been the most widely used solders for electronic assemblies. These alloys are used in applications ranging from consumer products to space communications systems and have been essential to the worldwide electronics industry. However, the replacement of Pb-bearing alloys is inevitable. Pb is toxic when ingested. In addition, Pb processing and reclamation may be detrimental to the environment. On the other hand, the connection between Pb use in electronics and harm to the environment remains a subject of research. Nonetheless, reduc- tion in Pb use will eventually be regulated. The European Union directives on Waste Electrical and Electronic Equipment (WEEE) dictate that products sold in the EU must be lead-free from July 1, 2006 (Nimmo 2002, Gamalski 2002). In Japan and Korea, major firms have moved forward with developing products with alternative alloys ranging from handhelds, such as calculators and minidisk players, to

Published: Jan 1, 2007

Keywords: Solder Joint; Solder Alloy; Lead Free Solder; SnPb Solder; Surface Mount Technology

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