Affiliation:
1. University of Ljubljana, Faculty of Natural Sciences and Engineering, Ljubljana, Slovenia
2. Slovenian National Building and Civil Engineering Institute, Ljubljana, Slovenia
Abstract
Chromium-molybdenum steel (16Mo3) is widely used in petroleum, gas, automotive, and construction industries due to its good oxidation resistance and mechanical properties at moderately elevated temperatures. The aim of the research was to evaluate the corrosion susceptibility of 16Mo3 steel in hot rolled and aluminized states. Aluminization was performed by diffusion pack aluminization process at 900?C/2h and 730?C/4h, respectively. Electrochemical corrosion testing included measuring open circuit potential (EOCP), linear polarization resistance (LPR), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) in potassium phosphate buffer (KH2PO4, pH = 7). Optical microscopy (OM), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS) were used for surface layer microstructure characterization before and after corrosion tests. It was demonstrated that corrosion resistance of aluminized steel increased substantially. Corrosion properties were related to the structure and properties of intermetallic phase (FeAl, FeAl2 and Fe2Al5) that formed on the surface of 16Mo3 steel.
Publisher
National Library of Serbia
Subject
Materials Chemistry,Metals and Alloys,Mechanics of Materials,Geotechnical Engineering and Engineering Geology
Reference27 articles.
1. M. Hofmann, H. Biermann, Static and cyclic deformation behavior of the ferritic steel 16Mo3 under monotonic and cyclic loading at high temperatures, Steel Research International, 83 (7) (2012) 631-636. https://doi.org/10.1002/srin.201100238
2. M. Özdemir, H. Hakan Gökmeşe, V. Yilmaz, The development of microstructure and mechanical properties of Cr-Mo high temperature steel in different heat-treated-state, Journal of Basic and Applied Research International, 11 (4) (2015) 198-205. https://doi.org/10.5281/zenodo.7688358
3. J. Metsäjoki, E. Huttunen-Saarivirta, T. Lepistö, Elevated-temperature corrosion of uncoated and aluminized 9-12% Cr boiler steels beneath KCl deposit, Fuel, 133 (2014) 173-181. https://doi.org/10.1016/j.fuel.2014.05.017
4. B. Lemmens, Y. Gonzalez Garcia, B. Corlu, J. De Strycke, I. De Graeve, K. Verbeken, Study of the electrochemical behaviour of aluminized steel, Surface and Coatings Technology, 26 (2014) 34-38. https://doi.org/10.1016/j.surfcoat.2014.06.064
5. M. Akhoondan, A. Sagüés, Corrosion of aluminized steel in aggressive natural water, ECS Transactions - The Electrochemical Society, 4 (19) (2013) 25-35. https://doi.org/10.5006/0879