DECHEMA

About: DECHEMA is a nonprofit organization based out in Frankfurt am Main, Germany. It is known for research contribution in the topics: Corrosion & Oxide. The organization has 756 authors who have published 1307 publications receiving 25693 citations.

Infrastructure Challenges Caused by Industrial Transformation to Achieve Greenhouse Gas Neutrality. Ammonia Production in the Antwerp‐Rotterdam‐Rhine‐Ruhr Area

Abstract: Several pathways for potentially greenhouse gas neutral production of ammonia have been investigated compared to today's conventional ammonia production at chemical sites in Antwerp, Dormagen, and Geleen. These pathways include on-site water electrolysis using grid electricity, off-site production via water electrolysis using renewable electricity and supply of green hydrogen to the site, pyrolysis of natural gas and conventional ammonia production coupled with CO2-capture on-site and transport to a storage site. All pathways effectively eliminate scope 1 emissions present in conventional production but continue to emit scope 2 emissions from grid electricity consumption. Eventually, a coordinated industry-wide and cross-industry effort is needed to address the transformational changes and develop the common cross-border infrastructures.

Treating the surface of Al and Ti alloys, comprises applying halogen compounds to improve oxidation resistance

Abstract: Treating the surface of aluminium and titanium alloys, comprises applying halogen compounds to improve their oxidation resistance between 700 and 1100 [deg] C. The compound is e.g. a fluoro carbon.

The influence of gaseous impurities in air on the high temperature corrosion of coated and uncoated nickel-based superalloys

Abstract: The influence of small concentrations of SO2, HCl or Na2SO4 vapour in air on the corrosion of the uncoated nickel-based superalloys IN 792 DS + Hf, CMSX-6 and MA 760 ODS and the coatings RT 22 and LCO 22 has been investigated at 1000 and 1100°C. A level of 1% SO2 in air somewhat increased the oxidation of IN 792 DS + Hf and favoured the scale spallation of CMSX-6 at 1000°C. Some precipitates of Ti sulphide were found in the subsurface zones of both alloys. No influence was observed at 1100°C. The oxidation of MA 760 ODS and the two coatings was not affected by SO2 at 1000 and 1100°C. The addition of 100ppm HCl to air favoured the spallation of the scales of IN 792 DS + Hf and CMSX-6 at 1000°C. Again, no influence could be observed with these alloys at 1100°C nor with MA 760 ODS or the coatings at either of these temperatures. Contrary to expectations, no synergistic effect was found in air with 1% SO2 and 100ppm HCl, but SO2 reduced the negative effect of HCl. Catastrophic corrosion occurred with IN 792 D...

Microprobe and TEM investigations into samarium-cobalt magnets of the 1–7 type

Abstract: The preparation of magnets with energy products of up to 30 MGOe from Sm(Co, Cu, Fe, M)z alloys with M=Ti or Zr and z=6.8 or 7.25, respectively, as well as their magnetic properties and microstructures have already been reported on. We describe, in addition, the distribution of the non-metallic impurities, O, N, and C, and the phases which they form with the metallic constiturents as found by electron beam micro analysis and transmission electron microscopy. Ti, Zr, and C combine in forming the very stable carbides TiC and ZrC. The possible role of these carbides in regard to the magnetic properties is discussed.