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Institution

DECHEMA

NonprofitFrankfurt am Main, Germany
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.
Topics: Corrosion, Oxide, Coating, Alloy, Catalysis


Papers
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Journal ArticleDOI
TL;DR: In this article, the target aimed design of anodic oxide films on AA5005 by modified phosphoric acid anodizing and reinforcement by subsequent impregnation with nanosized silicon dioxide by chemical nanotechnology.
Abstract: The present work deals with the target aimed design of anodic oxide films on AA5005 by modified phosphoric acid anodizing and reinforcement by subsequent impregnation with nanosized silicon dioxide by chemical nanotechnology. The authors show the influence of the anodizing time on the oxide layer thickness, the pore diameter and the morphology. It is revealed that silicon dioxide nanoparticles are successful when incorporated into the open structure pores of the layer. The anodizing and the incorporation process were carried out wet on wet. Complementary electrochemical measurements show the potential of the modified oxide layer in view of corrosion protection despite their deliberated open porosity.

7 citations

Journal ArticleDOI
Lutz Friedel1
TL;DR: In this paper, the authors proposed a method to calculate the pressure drop of a rupture disc/safety valve unit by means of experimentally determined relative discharge reduction coefficients to the flow resistance of the safety valve in the unit.
Abstract: For straightforward engineering design purposes, the pressure drop of a rupture disc/safety valve unit is related by means of experimentally determined relative discharge reduction coefficients to the flow resistance of the safety valve in the unit. In the case of single phase flow the pressure drop can be calculated on the basis of the liquid or gas/vapour flow discharge coefficients available from the respective suppliers' catalogues. For two phase flow conditions reference must be made to the fitting correlations of S.D. Morris or H.C. Simpson et al. , which are presently the most accurate methods available.

7 citations

Journal ArticleDOI
TL;DR: In this article, an analysis of an aluminide coating deposited by pack cementation on austenitic steel 800HT tubes belonging to an industrial catalytic reactor for hydrogen production by reforming was carried out.

7 citations

Journal ArticleDOI
Alexander Donchev1, H. Fietzek, Vladislav Kolarik, D. Renusch1, Michael Schütze1 
TL;DR: In this article, in situ acoustic emission (AE) for monitoring scale cracking, deflection testing in monofacial oxidation (DTMO), and in situ X-ray measurements were complemented by detailed post-experimental metallographic investigations.
Abstract: Investigation of the oxidation behavior of 9% Cr steels at 650°C in dry air and air + 10% H2O have shown that oxide scale growth stresses may play a significant role in breakaway. For this reason, preliminary studies on the development and characteristics of growth stresses in oxides on these materials have begun. These studies include in situ acoustic emission (AE) for monitoring scale cracking, deflection testing in monofacial oxidation (DTMO) and in situ X–ray measurements. The measurements were complemented by detailed post-experimental metallographic investigations.From the DTMO measurements the stresses in the oxide on the specimens tested in humid environment are increased by about a factor of 5 compared to dry air at the beginning of oxidation for P91. In a humid environment the stresses decrease with oxidation time while in dry air they remain almost constant. Significant acoustic emission (AE) occurs in humid air for oxidation coupons while virtually no AE is observed for thin foils in a...

7 citations

Journal ArticleDOI
A. Rahmel1
TL;DR: The Korrosionsstromdichte wird durch das Verhaltnis des herausragenden and des eintauchenden Oberflachenenanteils bestimmt.

7 citations


Authors

Showing all 760 results

NameH-indexPapersCitations
Wolf B. Frommer10534530918
Michael W. Anderson10180863603
João Rocha93152149472
Martin Muhler7760625850
Michael Hunger6029511370
Ivars Neretnieks442247159
Michael Schütze403436311
Jens Schrader381294239
Roland Dittmeyer312063762
Lei Li291984003
Dirk Holtmann291073033
Lasse Greiner26741994
Klaus-Michael Mangold23571590
A. Rahmel23591967
Gerhard Kreysa22781305
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20231
20227
202145
202053
201949
201844