The Electrochemical Behavior of Electroless Plated Ni-P Alloys in Concentrated NaOH Solution

Ping Ho Lo, Wen Ta Tsai, Ju Tung Lee, Ming Pan Hung

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)

Abstract

Electroless Ni-P deposits with phosphorus content ranging from 4.8 to 12.8 weight percent (w/o) were examined using potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) techniques to characterize the effect of phosphorus on the corrosion behavior of electroless nickel-plated mild steel in deaerated 40 w/o NaOH solution. Anodic polarization of the electroless Ni-P alloys in caustic NaOH solution shows that the passive current density decreases with increasing phosphorus content in the deposits. At an applied potential of -1.2 V vs. saturated calomel electrode (VSCE) (close to their Ecorr). EIS data indicate that the Rctfor Ni-P alloys in NaOH solution increases with increasing phosphorus content. X-ray photoelectron spectroscopy (XPS) results suggest that the primary constituent formed on the Ni-P surface after EIS measurement in 40 w/o NaOH solution at an applied potential of -0.4 VSCE (in the passive region) is Ni(OH)2, which is responsible for the passivity of the Ni-P alloys. The polarization resistance of Ni-P alloys in NaOH solution at -0.4 VSCE also increases with increasing phosphorus content.

Original languageEnglish
Pages (from-to)91-96
Number of pages6
JournalJournal of the Electrochemical Society
Volume142
Issue number1
DOIs
Publication statusPublished - 1995

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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