26. Polymeric and Ceram1C-Like Coatings on the Basis of Sin(C) Precursors for Protection of Metals Against Corrosion and Oxidation
- Dongming Zhu,
- Uwe Schulz,
- Andrew Wereszczak and
- Edgar Lara-Curzio
Published Online: 26 MAR 2008
Copyright © 2007 The American Ceramics Society
Advanced Ceramic Coatings and Interfaces: Ceramic Engineering and Science Proceedings, Volume 27, Issue 3
How to Cite
Günthner, M., Albrecht, Y. and Motz, G. (2006) Polymeric and Ceram1C-Like Coatings on the Basis of Sin(C) Precursors for Protection of Metals Against Corrosion and Oxidation, in Advanced Ceramic Coatings and Interfaces: Ceramic Engineering and Science Proceedings, Volume 27, Issue 3 (eds D. Zhu, U. Schulz, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291320.ch26
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 2006
Print ISBN: 9780470080535
Online ISBN: 9780470291320
- clariant ag
Since the price of steel and metals increased rapidly in the last few years, further approaches for protection metal substrates against wear, corrosion or oxidation are necessary. Thin ceramic coatings are promising candidates for this aim. Besides thermal spraying or CVD-and PVD-processes, simple varnish-techniques can be used to deposit thin films.
Two different special tailored solid and very good soluble precursors in the systems Si-C-N (ABSE) and Si-N (PHPS) have been developed for applications of polymer and ceramic-like coating materials. With corresponding precursor solutions in toluene or ether substrates with complex geometry can be coated by simple dip- or spray-coating-techniques. The degree of cera-misation and the properties of the resulting coatings are adjustable by special temperature programs. Processing and pyrolysis are possible either in inert atmospheres like nitrogen or in air.
Earlier results have shown that especially metals like aluminium, copper and magnesium can be effectively protected against acids, bases and aqueous salt solutions by thin SiN(C)-layers. Furthermore, hard gradient coatings up to 50 urn in thickness can be generate by the in-situ reaction of titanium substrates with SiN(C)-coatings through the formation of nitrides, silicides and carbonitrides near the surface.
New investigations exhibit a great potential of the ABSE- and PHPS-coatings to protect steel sheets (e.g. X5 Cr Ni 18–10) against corrosion (especially in acids) and against oxidation up to 1000 °C. The resulting SiON(C)-layers in the surface act as an excellent diffusion barrier against oxygen and reduce the weight gain by oxidation about two orders in magnitude.