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Lehrstuhl für Allgemeine und Analytische Chemie

Current projects

Stress corrosion cracking of high strength steel wire materials

Abstract: Oil production off the coast requires materials with the highest strength and resistance to stress corrosion cracking due to increasingly exposed wells. This project tests new materials in the field of low- and high-alloyed steels for such applications and optimizes these materials along the entire process chain to guarantee optimum safety for people and the environment.

Project funding: Third party funding

Project partners: voestalpine Wire Technology GmbH and voestalpine BÖHLER Edelstahl GmbH & Co KG

Project start: December 2019

Team: Mathias Truschner, Gregor Mori

Sauergasbeständigkeit hochlegierter Werkstoffe mittels SSRT (Slow Strain Rate Test) in Autoklaven

Abstract: Nowadays the oil-field development expands into deeper and more corrosive environment containing H2S, CO2 and brine at high temperature and high pressure, where materials should meet the criteria for corrosion resistance and mechanical properties. The required service life of such materials can be estimated and controlled by a standardized slow strain rate testing (SSRT) method, which proved to be quick and simple among other methods. Voestalpine BÖHLER Edelstahl GmbH & Co KG built up a laboratory for analysis of corrosion-resistant alloys (CRA) by SSR testing. In this work the development of SSRT method for environment stress corrosion cracking (SCC) as well as the verification of its results will be done. The testing procedure is developed in accordance with NACE standard TM0198-2016, where the samples undergo slow continuous strain at a constant extension rate until total failure in the simulated sour environment at elevated temperatures. The susceptibility of the material to stress corrosion cracking will be examined visually for evidence of brittle cracking and by measurement of the ductility parameters (reduction in area and plastic elongation) of sample tested in the sour environment compared with the sample tested in the inert environment.

Project funding: Third party funding

Project partners: voestalpine BÖHLER Edelstahl GmbH & Co KG

Project start: August 2019

Team: Anastasiia Galakhova, Werner Keppl, Andreas Schalli, Karl Prattes, Gregor Mori

Hydrogen embrittlement of stainless steels in the production of renewable energies

Abstract: Corrosion resistant alloys for microbiological methanation applications are investigated in terms of hydrogen embrittlement. Constant load tests are performed in various atmospheres with up to 100 bar H2. The corresponding hydrogen absorption of steel specimens is measured, and the results are compared with those obtained after immersion in H2S-saturated solution.

Project funding: Third party funding

Project partners: voestalpine BÖHLER Edelstahl GmbH & Co KG

Project start: April 2019

Team: Anton Trautmann, Mathias Truschner, Josefine Pfeiffer, Andreas Keplinger, Gregor Mori

Publication(s): Trautmann, A., Mori, G., Siegl, W. et al. Berg Huettenmaenn Monatsh (2020) 165: 40.

Electropolishing of molybdenum

Abstract: The project aims in finding the optimal parameter setup for inside electropolishing of molybdenum tubes in order to the industries requirement of polishing tubes with the smallest inside diameter and as long as possible. Therefore electropolishing tests are operated under potentio- and galvanostatic conditions. Furthermore the effect of PCR (periodic current reversal) in the electropolishing process is investigated.

Project funding: Third party funding

Project partners: Plansee SE

Team: Matthias Eichinger, Gregor Mori, Bernhard Mayr-Schmölzer

Completed projects

Underground Sun Conversion...

Underground Sun Conversion – WP 4 (Materials and Corrosion)

Abstract: Microbiological methanation is being investigated in an existing porous natural gas reservoir. Since H2 is involved in the process, the hydrogen embrittlement of steel must be considered. Therefore, a test routine was developed, and a unique autoclave test bench was designed to simulate field conditions. With this Hydrogen Embrittlement Autoclave Testbench (H.E.A.T.) different carbon steels were tested in up to 100 bar H2. Constant load tests (CLTs) were performed and the corrosion rate and hydrogen absorption of specimens were measured. A material recommendation for the equipment on site was given.

Project funding: Austrian Climate and Energy Fund (FFG project number 855231)

Project partners: RAG Austria AG, University of Natural Resources and Life Sciences (BOKU), acib GmbH, Energieinstitut an der Johannes Kepler Universität Linz, Axiom angewandte Prozesstechnik Ges.m.b.H.

Project start: April 2017

Team: Anton Trautmann, Mathias Truschner, Josefine Pfeiffer, Markus Oberndorfer, Gregor Mori

Publication(s): Trautmann, A., Oberndorfer, M., Mori, G., & Bauer, S. (2019, May 15). Susceptibility of Selected Steel Grades to Hydrogen Embrittlement - Simulating Field Conditions by Performing Laboratory Wheel Tests With Autoclaves. NACE International. https://onepetro.org/conference-paper/NACE-2019-13402

Project homepage: underground-sun-conversion.at

Druckwasserstoffuntersuchungen...

Druckwasserstoffuntersuchungen an Armco-Eisen und einer 30CrNiMo8-Legierung

Abstract: Es wurden Druckwasserstoff-Beladungsversuche im Autoklaven mit bis zu 100 bar PH2 an verschieden umgeformten und geglühten Armco-Eisen sowie an dem Vergütungsstahl 30CrNiMo8 durchgeführt. Es zeigt sich, dass ein höherer Umformgrad zu einer steigenden Wasserstoffbeladung führt.   Temperatur und Zeit haben keinen großen Einfluss auf den   Gesamtwasserstoffgehalt. Der Vergütungsstahl zeigt nur eine geringe   Neigung zur Wasserstoffaufnahme. Langsamzugversuche am 30CrNiMo8   ergeben bei 10bar Wasserstoffdruck keine Neigung zur Versprödung.

Project funding: Third party funding

Project partners: Robert Bosch GmbH, voestalpine Tubulars GmbH & Co KG, voestalpine Stahl Donawitz GmbH, Materials Center Leoben Forschungs GmbH

Project start: Juli 2019

Team: Rüdiger Ruff, Wolfgang Siegl, Gregor Mori

Depassivation and Repassivation...

Depassivation and Repassivation of Stainless Steels

Abstract: In oil and gas production, deep wells producing highly aggressive media are often completed with highly alloyed corrosion resistant alloys (CRAs, mainly steels). These CRAs have excellent corrosion properties due to the formation of a passive layer of chromium, iron and molybdenum oxides and hydroxides. During acidizing jobs, when a plugged well is re-opened, and during sand production at high flow velocities, localized or uniform depassivation can occur and yield high corrosion rates of used CRAs.
In the present work the resistance of passive layers of various stainless steels was investigated alongside the conditions and kinetics of when these layers are rebuilt. Methods applied consisted of: potentiodynamic experiments, immersion tests, scratch tests and variable pH flow experiments. Results revealed that, with the exception of those with very low alloys, all stainless steels showed repassivation after acidizing when the pH level increased above 3. Repassivation occurs within 100 s to a certain (sufficient) extent, although the passive layer is not completely rebuilt within this period.

Project funding: Third party funding

Project partners: OMV, ZAG (Slovenian National Building and Civil Engineering Institute)

Project start: August 2016