Formation and characterization of 1, 5-diphosphono-pentane films on polycrystalline zinc substrates

A. Pilbáth, I. Bertóti, É Pfeifer, J. Mink, L. Nyikos, E. Kálmán

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Investigation on time-dependent layer formation was performed on high purity polycrystalline zinc surface in reaction with aqueous solution of 1, 5-diphosphono-pentane (DPP) at room temperature. Film evolution was characterized by X-ray photoelectron spectroscopy, contact angle, atomic force microscopy, glow discharge optical emission spectroscopy and detailed infrared reflection absorption spectroscopy measurements. Development of a partly crystalline zinc-diphosphono-pentane conversion layer of increasing thickness with time was determined by consistent evaluation of the results. The formed layers turned the hydrophobic zinc surface to hydrophilic. The conversion-type interaction of diphosphonic acid compounds with the oxidized zinc surface resulting in zinc-diphosphonate salt was unambiguously justified by XPS and GD-OES analysis. The corrosion behaviour of the coated zinc substrate was studied using electrochemical impedance spectroscopy (EIS). The formed layers show significant protective effect in sodium-sulphate solutions. It was shown, that under the applied conditions, a 4 h treatment is necessary to obtain 75% protection efficiency after 4 h of immersion into the Na2SO4.

Original languageEnglish
Pages (from-to)1182-1192
Number of pages11
JournalSurface and Coatings Technology
Volume203
Issue number9
DOIs
Publication statusPublished - Jan 25 2009

Keywords

  • 1, 5-Diphosphono-pentane
  • Conversion layer
  • EIS
  • IRRAS
  • XPS
  • Zinc

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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