Alternatives to Cr(VI) Conversion Coatings for Magnesium Alloys

  1. Prof. Dr.-Ing. K. U. Kainer
  1. I. Azkarate,
  2. P. Cano,
  3. A. Del Barrio,
  4. M. Insausti and
  5. P. Santa Coloma

Published Online: 15 MAY 2006

DOI: 10.1002/3527607552.ch76

Magnesium Alloys and their Applications

Magnesium Alloys and their Applications

How to Cite

Azkarate, I., Cano, P., Del Barrio, A., Insausti, M. and Santa Coloma, P. (2000) Alternatives to Cr(VI) Conversion Coatings for Magnesium Alloys, in Magnesium Alloys and their Applications (ed K. U. Kainer), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607552.ch76

Editor Information

  1. GKSS-Forschungszentrum Geesthacht GmbH, Institut für Werkstofforschung, Max-Planck- Straße, D-21502 Geesthacht, Germany

Author Information

  1. Fundación INASMET, Camino de Portuetxe 12, 20009 San Sebastián, Spain

Publication History

  1. Published Online: 15 MAY 2006
  2. Published Print: 20 SEP 2000

ISBN Information

Print ISBN: 9783527302826

Online ISBN: 9783527607556

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Keywords:

  • magnesium alloys;
  • alternatives to Cr(VI) conversion coatings

Summary

A chemical conversion surface treatment based on permanganate and phosphate salts for magnesium alloys (AZ91D and WE43A) has been developed in this work. The process has been optimised for corrosion resistance using Design of Experiments techniques. The morphology and composition of the optimised conversion layers have been analysed. The corrosion behaviour of these layers have been compared with chromated conversions in salt spray fog and electrochemical tests. The Mn-based conversion has resulted to be competitive with the Cr-based conversions concerning corrosion resistance.