Corrosion and electrochemistry

The Corrosion and Electrochemistry Laboratory is well equipped with a broad range of electrochemical instruments, sample preparation equipment and film monitoring facilities. A biocorrosion rig is under construction. For the moment one post.doc and 4 PhD students are involved in the activities. Several Master theses have been a result of this research. Papers of corrosion research can be given on request.

Sulphur chemistry has been of major interests. The chemistry of the sulphur compounds has been examined by cyclic voltammetric measurements using disk and ring disk electrodes. Work from this area is described in the PhD-theses by E. Skavås and partly in S. Richter PhD-theses at Iceland University. Some selected papers:

- E. Skavås and T. Hemmingsen: Kinetics and mechanism of sulphite oxidation on a rotating platinum disc electrode in an alkaline solution. Electrochim. Acta 52 (2007) 3510.

- L.R. Hilbert, T. Hemmingsen, L.V. Nielsen and S. Richter: Reliability of Electrochemical Techniques for Determining Corrosion Rates on Carbon Steel in Sulfide Media. Corrosion 63 (2007) 346.

The sulphur has also been examined with respect to film formation properties where film-monitoring techniques were combined with electrochemical measurements by post.doc F. Fusek. The film starts with a 2-dimensional growth covering the steel surface which proceeds in film a 3-dimensional growth giving a thicker film:

T. Hemmingsen, F. Fusek and E. Skavaas: Monitoring of the Corrosion Process on Sulphide Film Formation with Electrochemical and Optical Measurements. Electrochim. Acta 51 (2006) 2919.

T. Hemmingsen and H. Lima: Electrochemical and optical studies of sulphide film formation on carbon steel. Electrochim.Acta. 43 (1998), 35.

In corrosion process hydrogen is produced and if hydrogen is trapped in the metal it will result in hydrogen embrittlement. The rate of hydrogen permeation can be measured by use of a Devanathan-Stachurski cell. Post.doc E. Hörnlund examined the effect of sulphur compounds that provoke an increase in adsorbed hydrogen in the metal.

- E. Hörnlund, J.K.T. Fossen, S. Hauger, C. Haugen, T. Havn and T. Hemmingsen: Hydrogen Diffusivities and Concentrations in 520M Carbon Steel under Cathodic Protection in 0.5M NaCl and the Effect of Added Sulphite, Dithionite, Thiosulphate, and Sulphide. Int. J. Electrochem. Sci., 2 (2007) 82.

A new activity started up in cooperation with Statoil and IFE where PhD student T. Berntsen under co-supervision from Researcher Marion Seiersten at IFE will examine the formation of a corrosion protective film under pH stabilized multiphase fluids in transportation lines. Four master students were involved in the project in 2011.

- T. Berntsen, M. Seiersten, T. Hemmingsen: Effect of FeCO3 Supersaturation and Carbide Exposure on the CO2 Corrosion Rate of Carbon Steel, NACE Corrosion 2011

In addition a Strategic Institute project has run for 3 years at IFE, ”Fundamental Understanding of Localised Corrosion in H2S-Containing Environment” (NFR-project 186937). The effect of sulphide on localised corrosion will be examined by vil bli PhD student Yuan Song under co-supervision from Researcher Jon Kvarekvål at IFE. One master student was involved in the project in 2011.

 - Y. Song, A. Palencsar, G. Svenningsen, J. Kvarekval, T. Hemmingsen: Effect of O2 and temperature on sour corrosion. NACE Corrosion 2011

Producing oil- and gas from deep water faces new challenges for the equipment. The corrosion behaviour at deep water under such conditions. A collaboration with Researcher Magnus Hurlen Larsen at Nexans Norway involved two master students in 2009.

Contact person: Tor Hemmingsen