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Snow D-excess OriGin Study

Overturning circulation in the new Arctic

Chronic wasting disease  prions from Norwegian cervids: Assessing the pathogenesis, shedding, spillover and zoonotic potential

The illusion of empty blind zones: How things may seem to appear out of nowhere in magic shows and road accidents

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CORAL, Produkter av resirkulert aluminium – utvikling av overflater med god heft mellom aluminium og en beskyttende, dekorativ overflate

Midlene fra BIA-Brukerstyrt innovasjonsarena fordelt på år

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Senior Research Scientist

Using post-consumer scrap as a major source for products, the energy consumption and CO2 emissions can be largely reduced, compared to the energy required for production of primary metal. 
This large reduction of CO2 emissions will increase the competitiveness of aluminium vs other materials in the increasing number of applications where carbon footprint is a key material selection criterion used by designers or architects. 
In the Coral project, the focus is on coated surfaces of aluminium (profiles and plates) for architectural use. 
Among powder coaters, there is some scepticism in using recycled aluminium for such applications, due to concern about increased filiform corrosion (FFC) caused by a higher level of impurity elements in the recycled material. 
The aim of the Coral project is therefore to develop a sustainable surface treatment process before coating, which provides profiles and plates made from recycled aluminium with the same surface quality as those made from primary aluminium. 
So far, we have investigated if there were differences in the microstructure of material based on mainly post-consumer scrap compared to primary aluminium after the same processing. Results show that the percentage of the post consumer scrap in the alloy does not influence the alloy characteristic as long as chemistry is similar.  However, as the concentration of trace elements is going to increase with increased recycling rate, the effect of trace elements such as copper and zinc, as well as impurities such as nickel, on filiform corrosion and response to surface treatment is important to investigate. Materials for investigation have been selected and appropriate surface analysis studies are in progress. The effect of copper both as alloy element as well as in a conversion coating bath on the electrochemical properties has been investigated, without strong characteristic dependencies in the relevant concentration range.
In addition, work together with the European Surface Treatment Association (ESTAL) continued to investigate the compatibility of current surface treatment processes with recycled aluminium. The results of filiform corrosion and acetic acid spray testing should help to understand critical factors during powder coating of aluminium  and are shared with ESTAL working group.

A surface treatment process shall be developed, which provides aluminium alloys produced from >75% end-of-life (EOL) scrap reproducibly with the same surface quality as alloys produced from primary aluminium, in particular in regard to resistance against filiform corrosion (FFC). The amount of EOL scrap in commercial aluminium alloys is bound to increase. Amongst end users of aluminium, increased use of recycled aluminium is met with large enthusiasm. An ambitious goal is to produce the same alloys as today, but containing close to 100% EOL scrap. Initial results from Hydro indicated that most quality criteria can be met. The major stumbling block is that surface enrichment of certain elements in EOL scrap based alloys may lead to susceptibility towards FFC. FFC resistance is crucially affected by the surface treatment of the metal. It is not obvious that conventional surface treatments can cope with the increased complexity of alloys based on EOL scrap. The idea of this project is (a) to design surface treatment strategies that limit FFC, by (b) investigating the FFC mechanism on  EOL scrap based alloys. The project shall first collect data about trace and alloy element distribution in EOL scrap based alloys, e.g. by high level analytical techniques. Second, the project will investigate surface enrichment of trace and alloy elements after different surface treatment steps, such as alkaline and acid etching, desmutting, conversion coating or anodising. Third, rate and mechanism of FFC will be studied by corrosion tests and in situ analysis techniques, and correlated to the local composition. The results of this will be used to design a surface treatment method which avoids enrichment of elements on the surface. Finally, industrial line trials using the new surface treatment process will be conducted. Ensuring FFC resistance of EOL scrap based alloys is essential for the market acceptance of such alloys, and thus for the “green shift” in aluminium production.

CORAL, Coated Recycled Aluminium   - developing surfaces for 
well-adhering and corrosion resistant coating systems

Understanding New Markets

NOBIPOL  - Centre for Biopolymer  Engineering at NTNU

0 projects

MATPROG-Matprogrammet: Norsk mat fra sjø og land

Understanding New Markets

Awarded: NOK 18.0 mill.

Project Period: 2002-2007

Location: Ukjent Fylke

MATPROG-Matprogrammet: Norsk mat fra sjø og land

NOBIPOL - Centre for Biopolymer Engineering at NTNU

Awarded: NOK 22.5 mill.

Project Period: 2002-2007

Location: Trøndelag - Trööndelage