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Analýza přerozdělení prvků feritických ocelí s Ni povlakem pro technologie roztavených solí
Král, Lubomír ; Čermák, Jiří ; Matal, O. ; Šimo, T. ; Nesvadba, L. ; Jílek, M.
Changes in structure and chemical composition of Ni-coated ferritic steel ČSN 411523 are studied in the present paper. The Ni-coated material is perspective for applications in molten salts technologies. The samples were subjected to corrosion in molten mixture 60 mol. % LiF + 40 mol. % NaF at temperature 953 K, the duration exposition was 100, 300 and 1000 h. Experiments were carried out in a quasidynamic regime simulating the flow of the cooling media (the mixture of molten salts) in the pipeline system. The change of chemical composition in the vicinity of interface between the Ni layer and steel substrate was measured by SEM.
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Evaluation of the reliability of steel structures exposed to corrosion
Křivý, V. ; Marek, Pavel
This paper deals with the application of the probabilistic SBRA method to the reliability assessment of steel bar structures, where as main attention is paid to the valuation of possible corrosion effects. Advances in computer technology and informatics create assumptions for apposite reliability valuation of new designed as well as existing structures exposed to corrosion effects. Utilization of probabilistic simulation-based methods can offer to the designer’s quite easy, but simultaneously efficient and applicable tool for analysis of steel structures exposed to corrosion effects.
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Damaging Processes of Gas Pipelines in a Long-Time Operation
Gajdoš, Lubomír
The individual types of damage, which can occur during operation of gas pipelines, are assessed from the mechanical point ofview. Besides description of particular damaging processes,taking place in gas pipelines during operation, quantitative definitions of damage in faatigue, stress corrosion, general corrosion and pitting corrosion are proposed. Further a determination of critical parameters for individual kinds of damage is presented.
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Study of stagnant water occurrences and dripping waters in caves: Chemical composition and remarks to corrosion of dripstones
Zeman, Ondřej ; Bruthans, J. ; Filippi, Michal ; Vysoká, H.
Slight stagnant water occurrences (drops) were studied in four caves in the Czech Republic and Slovakia. Major components were analyzed (Na+, K+, Ca2+, Mg2+, SO42-, Cl-, NO3-), pH, conductivity and temperature were measured in the field. Results are shown in table 1. Waters coming from condensation differs by higher amount of sulphate and some other components if compared with dripping waters.
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