Open Access Conference Proceedings

Abstract: The key characteristic of austenitic Hadfield´s steel is its toughening (hardening) under mechanical loading (during operation). By the influence of mechanical loading austenite transformed to martensite, resulting in surface hardening (curing) with a good toughness. [..] Read more

Abstract: This paper describes experiments for the development of methods of non-destructive, non-contact surface diagnostics. This is oriented on technical systems in metallurgical operations with usage of laser scanners and digital image processing techniques. [..] Read more

Abstract: The operation of a blast furnace is characterized by simultaneous running chemical and physical processes. Hence, the influence of parameters like pressure, temperature and gas composition on the reduction behaviour of the iron bearing minerals cannot easily be presented in a simplified form, e.g. [..] Read more

Abstract: The aim of this article is to identify the main risks in internal logistics processes in companies involved in metallurgical supply chains. The article also includes an initial proposal on how to work with and eliminate some risks. [..] Read more

Abstract: This study investigates the application of infrared (IR) thermography for evaluating thermal-sprayed coatings, focusing on distinguishing coatings subjected to different thermal treatments and varying porosity levels. Experimental thermographic analysis demonstrated the capability of IR thermography to differentiate between coating variants. [..] Read more

Abstract: The aim of the present study was to investigate the effect of the concentration of precursors in the reaction mixture on the microstructure and electrochemical corrosion properties of MgAl-LDH coatings deposited on magnesium alloy AZ31. The concentrations of precursors Mg(NO3)2 and Al(NO3)3 were set to 0.10, 0.05, and 0.02 M and 0.10, 0.05, and 0.02 M, respectively. [..] Read more

Abstract: To describe a surface morphology of textured polymer coatings, the model of polymer chains attached to spherical granules was developed. By means of the model, we revealed the influence of coating density on its surface morphology. [..] Read more

Abstract: This paper presents some results of the study regarding the corrosion inhibition properties evaluated in HCl environment of drop casting deposited layers on steel, using ZnV2O6 oxide (obtained by hydrothermal and co-precipitation methods) and two Zn–metalloporphyrins, namely: Zn–5-pyridyl-10,15,20-tris(3,4-dimethoxyphenyl)-porphyrin (ZnPyDiMeOPP) and Zn-5(3OH-phenyl)-10,15, 20-tris-(3,4-dimethoxyphenyl)-porphyrin (Zn3OHtris34DiMeOPP).The open circuit potential measurement and potentiodynamic polarization electrochemical technique with Tafel representation were used to investigate the corrosion protection of mixed sandwich deposited layers.The performed tests revealed that the best corrosion resistance was obtained in the case of the steel coated with hydrothermally obtained ZnV2O6 oxide as first layer and Zn–5-pyridyl-10,15,20-tris(3,4-dimethoxyphenyl)-porphyrin (ZnPyDiMeOPP) as the second layer, i. e. [..] Read more

Abstract: The article presents the results of corrosion tests of multi-groove pads made with the MIG method on a C45E steel substrate. The process of welding the multi-groove pads was carried out with constant parameters of the pad-welding process (i.e. [..] Read more

Abstract: The mechanical and corrosion properties of weathering steel had been deeply studied in 70 and 80 ties of last century. In this period a lot of structure was built in the Czech Republic. [..] Read more

Abstract: At present, reinforced concrete or steel sheets with glass enamel are used for the construction of bioreactors, fermentation and storage tanks of biogas stations. To a lesser extent, corrosion-resistant steels are used and, in smaller dimensions, also plastics or fiberglass. [..] Read more

Abstract: In recent years, the cerium-based conversion coatings have been increasingly used as one of the more promising chromate coatings substitutes on aluminum alloys, as cerium compound do not pose environmental problems and the coatings provide an efficient corrosion protection close to that of chromium. The cerium-based layer was prepared from simple immersion of aluminium alloy sheets in a solution composed of a 4 - 8 g·L-1 Ce(NO3)3·6H2O; 30 - 50 ml·L-1 H2O2 (37 %) and 0.5 - 1,5 g·L-1 tannin at room temperature. [..] Read more

Abstract: The paper describes the corrosion resistance comparison of hot-dip zinc galvanized cast iron with flake graphite in relations to bronze. The practical application of investigated cast iron is planned as a materials for fitting elements working in corroding medium of sea water. [..] Read more

Abstract: It is generally recognized that the high content of non-metallic inclusions in structural steels alter their physical and mechanical properties. Formation of non-metallic inclusions is a complex phenomenon that depends on the composition, pressure and temperature of the working media. [..] Read more

Abstract: Metal structures, equipment, ships, port and hydraulic structures, other objects operating in river or sea water, after some time are exposed to the inhabitants of the aquatic environment. The surface is overgrown with algae; various small marine organisms attach to it. [..] Read more

Abstract: In December 2017 there was a crash of footbridge in Prague – Troja. This failure led to an increase in interest in current status of prestressed concrete stress-ribbon bridges in the Czech Republic and maximum effort to prevent another accident. [..] Read more

Abstract: The article provides an analysis and basic approaches to the choice of paint and varnish coatings and the technology of their application. A logical model of the life cycle of a paintwork system is presented. [..] Read more

Abstract: Magnesium and its alloys are very promising candidates for the development of degradable implants, but their application is limited by high corrosion rates. The corrosion resistance of magnesium materials can be increased by suitable surface treatment. [..] Read more

Abstract: Magnesium and its alloys are interesting materials but they have low corrosion resistance. Magnesium-aluminium double layered hydroxide (Mg-Al LDH) coatings were prepared on AZ31 alloy by hydrothermal method at 50 °C, 70 °C and 90 °C at different reaction times (3 h, 6 h and 24 h). [..] Read more

Abstract: Magnesium materials are desirable for surface treatment because of their low corrosion resistance. The preparation of coatings on AZ31 alloy by plasma electrolytic oxidation (PEO) in a bath with and without humic acid was investigated. [..] Read more