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.

Über den Zusammenhang zwischen Lochkorrosion und Festigkeitsverhalten austenitischer Chrom-Nickel-Stähle

Abstract: Im Hinblick auf die spannungsmechanischen Wirkungen der Lochkorrosion werden die Lochform, die Lochtiefe und -grose sowie die Haufigkeit der Lochfrasstellen diskutiert, die unter potentiostatischen Bedingungen an den Stahlen X5CrNi 18 9 und X5CrNiMo 18 10 in 3% NaCI entstehen. Relations between pitting corrosion and mechanical strength of austenitic chromium nickel steels The shape, depth and size as well as the frequency of pits formed under potentiostatic conditions on the surfaces of chromium-nickel steels (German designations X 5 CrNi 18 9 and X 5 CrNiMo 18 10) in 3% NaCl are studied with reference to stress mechanical effects of pitting corrosion. Comparative studies of pitting corrosion and strength behaviour of specimens at- tacked under pitting enable the residual tensile strength to be represented as a function of potential, and the tensile strength as such to be plotted as a function of a corrosion index containing pit depth and number. External effects like thermal treatment, alloy composition and cold deformation can be interpreted uniformly on the basis of all these graphical representations.

Appts. to measure corrosion resistance

Abstract: Appts. for thermogravimetric characterisation of the corrosion resistance of materials includes a commercial micro balance (21) to record mass change readings at temps. > 1500 deg C. The influence of a reading distortion due to corrosive attack on the sample support and the weighing rod can be eliminated by a two stage weighing. The sample (4) can be lifted off of the interchangeable weighing rod (5) by a lifting mechanism (18), so that on the one hand the rod can be weighed with and on the other hand without the sample. After subtraction of the readings, the actual sample wt. can be recorded.

Neue Biopharmazeutika durch Manipulation pharmakologischer Parameter

Abstract: Verbesserung der Bindungseigenschaften, Steuerung der Pharmakokinetik, Schutz vor proteolytischem Abbau: Eine ganze Reihe von Beispielen zeigt, wie mit proteinchemischen, gentechnischen und immunologischen Methoden Probleme bei der Anwendung von Proteintherapeutika in den Griff zu bekommen sind. Das rationale Design dieser makromolekularen Wirkstoffe fuhrt zu Arzneimitteln mit uberlegenen Eigenschaften.

Zukünftige Chancen einer elektrochemischen Kohlenutzung

Abstract: Future scope of electrochemical coal utilization. Based on fundamental thermodynamic considerations and with due regard to known electrochemical reactions of coal-like substances, the potential of electrochemical coal conversion processes is discussed for the following three main groups of primary products: syngas, aliphatic compounds, and aromatic compounds. Thermal efficiencies and yields are compared with those of competing processes. The indirect electrochemical degradation of coal to soluble aromatic compounds with peroxodisulfate as redox mediator is a promising route of potential interest.

Implantation of Y- and Hf-ions into a F-doped Ni-base superalloy improving the oxidation resistance at high temperatures

Abstract: The surface modification of Ni-base alloys with low Al-contents (between 2 and 5 wt.%) with fluorine leads to the formation of a protective alumina scale under high temperature service conditions. The combined implantation of fluorine and reactive elements (Y, Hf) can increase the adherence of this alumina scale needed for technical applications.