SMTA International Conference Proceedings

Electronic Assembly Pitting / Crevice Corrosion Research

Authors: Mike Bixenman, DBA, Wallace Ables, Richard Kraszewski, Chin Siang Kelvin Tan, Julie Silk, Keith Howell, Takatoshi Nishimura, Jim Hartzell, Karl Sauter, and Robert Smith
Company: Kyzen Corporation, Dell Computer, Plexus Corporation, Keysight Technologies, Nihon Superior, Enthone, Oracle, and HDPug
Date Published: 9/27/2015   Conference: SMTA International

Abstract: Pitting or crevice corrosion on printed circuit boards has not been well studied in the industry. This mechanism has been seen at small solder mask openings near circuit traces on printed circuit boards when stored or shipped in a humid environment with soldering fluxes that pass all standard tests. Failure modes are theorized to be driven by openings or defects in solder masks, voltage bias, flux activity and humidity levels. The High Density Packaging User Group Consortium is investigating this failure mechanism and the factors that cause the defect to occur.

Pitting / crevice corrosion is different than the well-studied electrochemical migration dendritic corrosion events. Test vehicles used to simulate pitting / crevice corrosion failure have been designed. Experiments to test the research hypothesis that pitting / crevice corrosion can occur on printed circuit boards soldered with no-clean wave fluxes are in progress and results to date will be documented in this research paper. This paper covers the correlation phase by comparing and contrasting existing IPC Test Methods to a newly designed Pitting / Crevice Corrosion test method. A description of the mechanism, data findings, inferences from the data findings and follow on research plans are reported in this paper.

Key Words: 

electrochemical migration, crevice corrosion, pitting corrosion

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