Temporary corrosion protection of galvanised steel by coatings containing cerium, yttrium and lanthanum

Sz Koszegi, I. Felhosi, F. H. Kśrmán, E. Kálmán

Research output: Contribution to journalConference article

Abstract

The temporary corrosion protection of continuously galvanised steel by rare earth metal containing salts has been investigated. The qualitative surface property, corrosion performance and adhesive feature of galvanised steel treated by immersion in cerium nitrate, cerium chloride, yttrium chloride and lanthanum chloride has been studied by surface analytical methods and electrochemical techniques. The surface film consists of Ce(III) from cerium nitrate solution using short (10 s and 60 s) immersion time occurs as an inhomogeneous layer on zinc coating. Applying long-term immersion period (30 min) the developed layer becomes more homogeneous from all of the solutions used. On EDS spectra oxygen peak appears when the time of film growth increases. This phenomenon indicates the oxide containing film development on the galvanised surface. The presence of protective film on the surface decreases the corrosion rate due to the anodic protection. Concerning the adhesive properties of the films testing by blending method, it can be established that acrylic paint covers the surface evenly without any cracks across the bending line. Based on the obtained results we can conclude that treatment in lanthanum- and yttrium-chloride solutions provides the most promising protective film properties on the galvanised surface.

Original languageEnglish
Pages (from-to)219-224
Number of pages6
JournalMaterials Science Forum
Volume473-474
Publication statusPublished - Apr 25 2005
Event4th Hungarian Conference on Materials Science, Testing and Informatics - Balatonfured, Hungary
Duration: Oct 12 2003Oct 14 2003

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Keywords

  • Electrochemical impedance spectroscopy
  • Galvanised steel
  • Paint adhesion
  • Passivation
  • Rare earth metal salts

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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