Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Rust-proof – even without chromium

Abstract:
Rust-proof - even without chromium

For a long time, chromium plating protected car bodies against rust - but this has been prohibited since 2007. However, chromium-free coatings are not suitable for universal use; they have to be adapted to the respective application. A new chromium-free coating can help.

Rust-proof – even without chromium

Germany | Posted on December 3rd, 2008



Years ago, the ice-cream van used to drive through residential areas, ringing a bell to entice people out of their houses. Today their place has been taken by scrap metal collectors. Whether it be refrigerators, washing machines or car parts - the dwindling natural resources mean that scrap metal is worth money. To ensure that the recycling of old cars, for example, does not pose a risk to human health and the environment, the European Parliament has issued a guideline: The use of toxic and carcinogenic chromium(VI) compounds in car manufacturing has been prohibited since mid-2007. Until then, a chromate layer underneath the paint protected the car body against corrosion. Since that time, several chromium(VI)-free protective coatings have made their way into industrial halls - but they do not afford the same degree of protection as chromium(VI) plating, and cannot be used on all types of metal surface.

Researchers at the Fraunhofer Institutes for Silicate Research ISC in Würzburg and for Machine Tools and Forming Technology IWU in Chemnitz, along with colleagues at the Institute for Corrosion Protection Dresden GmbH, have developed an alternative - based on nanocomposites. "The new nanomaterials we developed using the sol-gel method adhere very well to most types of galvanization that we examined," reports ISC project manager Dr. Johanna Kron. To produce them, the researchers dipped galvanized steel sheets into a coating sol and applied a powder coating. They subjected the coated sheets to a variety of load tests. One such test was to keep scratched steel sheets in a chamber filled with atomized brine for 360 hours, or 15 days, at a temperature of 35 degrees. They also placed the metal sheets in an environment chamber with a relative humidity of 100 percent for 240 hours, or 10 days. "These coatings protect most galvanized materials almost as well as commercial yellow chrome plating. Indeed, the new coatings are often even more effective than the chromium-free system and chromium(III) passivation currently on the market," says Kron.

Good anti-corrosion measures are one thing, but is it also possible to deep-draw and bend the metal sheets treated in this way without destroying the coating? "As the coatings are less than a thousandth of a millimeter thick, you can form the chromium-free coated metal sheets in exactly the same way as yellow chrome plated sheets," says Kron. The researchers can already produce the corrosion proofing on a laboratory scale. Kron believes that the system could be launched on the market in about five years' time.

####

About Fraunhofer-Gesellschaft
The Fraunhofer-Gesellschaft undertakes applied research of direct utility to private and public enterprise and of wide benefit to society.

For more information, please click here

Contacts:
Dr. Johanna Kron
Phone: +49 931 4100-631
Fax: +49 931 4100-698
Fraunhofer-Institut für Silicatforschung
ISC
Friedrichstr. 10a
97082 Würzburg
www.isc.fraunhofer.de

Patricia Weigel
Phone: +49 (371) 5397 1114
Fax: 61114
Fraunhofer Institute for Machine Tools and Forming Technology
IWU
Reichenhainer Straße 88
09126 Chemnitz
www.iwu.fraunhofer.de

Copyright © Fraunhofer-Gesellschaft

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Industrial Nanotech, Inc. to Publish PCAOB Audited Financials July 31st, 2014

Nanostructured metal-oxide catalyst efficiently converts CO2 to methanol: Highly reactive sites at interface of 2 nanoscale components could help overcome hurdle of using CO2 as a starting point in producing useful products July 31st, 2014

Carnegie Mellon Chemists Create Nanofibers Using Unprecedented New Method July 31st, 2014

Pressure probing potential photoelectronic manufacturing compound July 31st, 2014

Discoveries

Study finds physical link to strange electronic behavior: Neutron measurements offer new clues about iron-based superconductor July 31st, 2014

Nanostructured metal-oxide catalyst efficiently converts CO2 to methanol: Highly reactive sites at interface of 2 nanoscale components could help overcome hurdle of using CO2 as a starting point in producing useful products July 31st, 2014

Carnegie Mellon Chemists Create Nanofibers Using Unprecedented New Method July 31st, 2014

Pressure probing potential photoelectronic manufacturing compound July 31st, 2014

Announcements

Industrial Nanotech, Inc. to Publish PCAOB Audited Financials July 31st, 2014

Nanostructured metal-oxide catalyst efficiently converts CO2 to methanol: Highly reactive sites at interface of 2 nanoscale components could help overcome hurdle of using CO2 as a starting point in producing useful products July 31st, 2014

Carnegie Mellon Chemists Create Nanofibers Using Unprecedented New Method July 31st, 2014

Pressure probing potential photoelectronic manufacturing compound July 31st, 2014

Automotive/Transportation

Stanford team achieves 'holy grail' of battery design: A stable lithium anode - Engineers use carbon nanospheres to protect lithium from the reactive and expansive problems that have restricted its use as an anode July 27th, 2014

Nano-supercapacitors for electric cars July 25th, 2014

Using Sand to Improve Battery Performance: Researchers develop low cost, environmentally friendly way to produce sand-based lithium ion batteries that outperform standard by three times July 8th, 2014

Up in Flames: Evidence Confirms Combustion Theory: Berkeley Lab and University of Hawaii research outlines the story of soot, with implications for cleaner-burning fuels July 1st, 2014

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE