Amorphous Pd layer as a highly effective oxidation barrier for surface finish of electronic terminals
Journal
Corrosion Science
Journal Volume
83
Pages
419-422
Date Issued
2014
Author(s)
Abstract
The oxidation resistance of two important surface finishes, electroless Ni/immersion Au (ENIG) and electroless Ni/electroless Pd/immersion Au (ENEPIG), is studied. Auger electron spectroscopy and X-ray photoelectron spectroscopy analyses show that ENEPIG is more oxidation resistant. The oxidized species of Ni diffuse through the Au grain boundaries. The mechanism for this better performance is that the Pd layer has an amorphous structure. The amorphous Pd layer is able to inhibit the out-diffusion of Ni atoms through high-diffusivity paths. © 2014 Elsevier Ltd.
Publisher
Elsevier Ltd
Type
journal article