Corrosion Mechanisms of Lead-Free PCB Surface Finishes in Corrosive EnvironmentsAuthors: C. Xu, W.D. Reents, Jr., D.A. Fleming, J.P. Franey, G.E. Derkits Jr., P. Ahern, B. Wright, K. Demirkan, R. L. Opila, K. Hannigan, M. Reid, J. Punch, and M.N. Collins
Company: Alcatel-Lucent, University of Delaware, and Stokes Institute, University of Limerick
Date Published: 10/14/2012 Conference: SMTA International
In this work, corrosion products of lead-free PCB finishes in a mixed flowing gas (MFG) environment, designed to mimic the harshest ambient conditions found in the current worldwide marketplace, were characterized using optical microscopy, scanning Auger microscopy (SAM), Scanning Electron Microscopy/Energy Dispersive Spectroscopy (SEM/EDS), X-ray Diffraction (XRD) and Focused Ion Beam/Energy Dispersive Spectroscopy (FIB/EDS). The composition and structure of corrosion products were determined, providing insight into the corrosion mechanism for each finish studied in this work. Methods for improving corrosion resistance of the lead-free PCB finishes will be discussed in light of the experimental finding in this work. It is hoped that this understanding will benefit the development of more corrosion resistant surface finishes and optimization of current commercially available finishes.
corrosion mechanism, surface finish, mixed flowing gas
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