A comparison of the corrosion resistance of Cu-Ni-stainless steel multilayers used for EMI shielding

Yoon Seok Choi, Yun Ha Yoo, Jung Gu Kim, Sang Ho Kim

Research output: Contribution to journalArticlepeer-review

78 Scopus citations

Abstract

Metallic coatings used for electromagnetic interference (EMI) shielding must have a low electrical resistance, in order for them to provide effective electromagnetic wave shielding, as well as good corrosion resistance and adhesion, in order to guarantee the reliability of the electronic devices. The ordinary metallic coatings used for EMI shielding consist of a conductive layer, a corrosion resistant layer and a buffer layer. When metallic coatings are used for this purpose, the malfunctioning of the EMI shielding can easily occur because of the delamination of the coating layer induced by corrosion. Therefore, in this paper, the effects of multilayer stacking on the corrosion resistance were investigated. Several metals were deposited onto polycarbonate by RF magnetron sputtering. The structural characteristics of the resulting film were investigated by means of X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The protection of the copper film by the multilayer was examined by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in 3.5 wt.% NaCl solution. The results obtained from the potentiodynamic polarization and EIS measurements showed that the outer layer of duplex stainless steel afforded better protective efficiency than the other layers.

Original languageEnglish
Pages (from-to)3775-3782
Number of pages8
JournalSurface and Coatings Technology
Volume201
Issue number6
DOIs
StatePublished - Dec 4 2006
Externally publishedYes

Keywords

  • Corrosion resistance
  • EIS
  • EMI shielding
  • Multilayer
  • RF magnetron sputtering
  • SEM

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