Prediction of the electrochemical migration induced failure on power PCBs under humidity condition — A case study

Xue, Peng; Bahman, Amir Sajjad; Iannuzzo, Francesco; Gudla, Helene Conseil; Lakkaraju, Anish Rao; Ambat, Rajan

doi:10.1016/j.microrel.2022.114796

Cited by 1 publication

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Electrochemical migration (ECM) caused by corrosion is the main cause of PCB failure (Xue et al , 2022; Medgyes et al , 2015; Medgyes et al , 2023; Reiss et al , 2021; Yi et al , 2023; Yi et al , 2020). Especially with the miniaturization and high density of microelectronic systems, the metal on PCB becomes thinner and the distance between circuits becomes narrower, which results in heavier electrical loads on the metal and stronger electric field.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical migration behavior between Cu and Ag under a thin electrolyte layer containing chloride

Luo,

Qi,

Huang

2024

ACMM

View full text Add to dashboard Cite

Purpose The purpose of this paper is to investigate the effects of chloride ion concentration and applied bias voltage on the electrochemical migration (ECM) behavior between Cu and Ag under an NaCl thin electrolyte layer (TEL). Design/methodology/approach A self-made experimental setup for the ECM behavior between Cu and Ag was designed. An HD video measurement microscopy was used to observe the typical dendrite/corrosion morphology and pH distribution. Short-circuit time (SCT), short-circuit current density and the influence of the galvanic effect between Cu and Ag on their ECM behavior were studied by electrochemical tests. The surface morphology and composition of dendrite were characterized by FESEM/EDS. Findings The SCT increased with increasing NaCl concentration but decreased with increasing applied bias voltage, and the SCT between Cu and Ag was less than that between Cu and Cu because their galvanic effect accelerated the dissolution and migration of Cu. When NaCl concentration was less than or equal to 6 mmol/L, cedar-like dendrite was formed, whereas no dendrite formed and only precipitation occurred at high chloride ion concentration (100 mmol/L). The composition of the dendrite between Cu and Ag was copper. Research limitations/implications The significance of this study is to clarify the ECM failure mechanism of printed circuit board (PCB) with an immersion silver surface finish (PCB-ImAg). Practical implications This study provides a basic theoretical basis for the selection of protective measures and metal coatings for PCB. Social implications The social implication of this study is to predict the service life of PCB. Originality/value The ECM behavior of dissimilar metals under a TEL was investigated, the influence of the galvanic effect between them on their ECM was discussed, and the SCT increased with increasing NaCl concentration.

show abstract