Amorphous and nanocrystalline materials are frequently used in contemporary engineering. Glassy metals offer unique properties such as high hardness, small abrasive wear, and increased corrosion resistance. Amorphous / nanocrystalline alloys containing tungsten and molybdenum are especially interesting, because in addition to the mentioned properties they exhibit useful magnetic properties. Finally they are extensively investigated.

The physical and chemical properties of amorphous alloys of either tungsten or molybdenum and one or more iron-group metals [1-3] make those alloys an alternative for the chromium plating. If the protective coatings are obtained by the electroplating processes, and contain a relatively high percentage of tungsten or molybdenum they will outperform hard chrome deposits. Those deposits also exhibit a good resistance to strong oxidizing acids such as nitric and hydrochloric acids, unlike the hard chrome which corrodes rapidly when it is in contact with these corrodents.

The obtained X-ray diffractograms and STM micrographs indicate that the tungsten amorphous alloys consist of closely packed nanofibers oriented perpendicularly to the substrate surface. For the molybdenum alloys, the amorphous character (grain size in the range of tens of nanometers) is obtained for its content higher than circa 20 at %. The amorphous Ni-Mo alloys never formed nanofibers, what was detected for the Ni-W alloys.

For a complete evaluation of this kind of alloys a reliable corrosion study were added to its characterization.

References

1. M. Donten, Z. Stojek, H. Cesiulis, J. Electrochem.Soc., 150 (2003) C95

2. Donten M., Cesiulis H., Stojek Z., Electrochim. Acta, 45 (2000) 3389-3396.

3. Donten M, Cesiulis H., Stojek Z., Electrochimica Acta, 50 (2005) 1405–1412.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/11992 must be provided.

1. Modification of gold microelectrodes for detection of DNA hybridization