This paper presents detailed corrosion results for common surface finishes in both "industry standard" and "custom-designed" corrosion inducing environments. It is suggested that an improved understanding of the gaps between field and standardized test techniques may emerge from this work. Additionally, this paper focuses on demonstrating enhanced tarnish and corrosion performance for an immersion silver based final finish. A detailed review of the coating's confirmed functional and assembly performance, attained via a commercially installed system, is also provided.">

SMTA International Conference Proceedings


AN IMMERSION SILVER PWB SURFACE FINISH TO COMBAT HARSH ENVIRONMENTS

Authors: Ernest Long, Ph.D., John Swanson, and Lenora Toscano
Company: MacDermid
Date Published: 10/4/2009   Conference: SMTA International


Abstract: The corrosion of Pb-free PCB surface finishes in harsh, polluted working environments has been increasingly discussed and studied recently. Ever-improving advances in microchip and memory storage technology, combined with economic growth and industrialization in emerging markets have greatly expanded the reach of what are now common electronic goods. From this, observations relating to the performance of such systems in aggressive and unique environments may not be surprising. One challenging aspect of this subject emerges as designers, process suppliers, and other stakeholders attempt to characterize the corrosion performance of common surface finishes with "industry accepted" corrosion tests. It is being found that long-used test techniques are not matching field observations.

This paper presents detailed corrosion results for common surface finishes in both "industry standard" and "custom-designed" corrosion inducing environments. It is suggested that an improved understanding of the gaps between field and standardized test techniques may emerge from this work. Additionally, this paper focuses on demonstrating enhanced tarnish and corrosion performance for an immersion silver based final finish. A detailed review of the coating's confirmed functional and assembly performance, attained via a commercially installed system, is also provided.



Members download articles for free:

Not a member yet?

What else do you get when you join SMTA? Read about all of the benefits that go along with membership.

Notice: Sharing of articles is restricted to just your immediate work group. Downloaded papers should not be stored on an external network or shared on the internet.


Back


SMTA Headquarters
6600 City West Parkway, Suite 300
Eden Prairie, MN 55344 USA

Phone +1 952.920.7682
Fax +1 952.926.1819