Laser fabrication of W-reinforced Cu layers: I. Corrosion behavior in 3.5% NaCl solution and synthetic acid rain

P. K. Wong, C. T. Kwok, Hau Chung Man, D. Guo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)

Abstract

In both 3.5 wt% NaCl solution and synthetic acid rain (SAR), the laser-fabricated specimens possess lower corrosion current density (Icorr) than that of cp Cu despite the active shift in open-circuit potential (OCP). Although Cu is cathodic to W in 3.5 wt% NaCl solution, the Cu phase in the laser-fabricated specimens dominantly dissolves during the immersion test. This anomalous observation is possible because the OCP values of the laser-fabricated specimens, cp Cu and cp W are quite near to each other, while the anodic and cathodic current densities are all not negligible for the Cu and W phases at OCP. As the anodic current density of the Cu phase is greater than anodic current density of the W phase, the Cu phase corrodes more quickly than the W phase. For the laser-fabricated specimens immersed in SAR, the Cu phase is anodic and is selectively attacked while the W phase is passive due to the formation of WO3.
Original languageEnglish
Pages (from-to)397-408
Number of pages12
JournalMaterials Chemistry and Physics
Volume181
DOIs
Publication statusPublished - 15 Sep 2016

Keywords

  • Alloys
  • Coatings
  • Corrosion
  • SEM

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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