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Krivy V.,VSB - Technical University of Ostrava | Urban V.,VSB - Technical University of Ostrava | Kreislova K.,SVUOM Ltd
Key Engineering Materials | Year: 2015

The paper describes the basic attributes of the new developed analytical method used for the calculation of corrosion losses on structural elements designed from weathering steels. The calculation takes into account the locality of the structure, type of the weathering steel, position and location of a surface in the structure and compliance with structural and maintenance requirements. The methodology for experimental testing of the realistic corrosion rates is introduced in this paper as well. Source


Urban V.,VSB - Technical University of Ostrava | Krivy V.,VSB - Technical University of Ostrava | Kreislova K.,SVUOM Ltd
Procedia Engineering | Year: 2015

This paper deals with experimental corrosion tests carried out on weathering steel bridges. The basic property of the weathering steel is its ability to create a protective layer on its surface in favorable environments. This protective layer called patina covers the surface of the whole structure, protects against external climatic influences and the construction resists completely without an anticorrosion coating. This paper presents the program of experimental atmospheric corrosion test carried out on road bridges made of weathering structural steel. The article presents results of corrosion tests after one year of exposure of corrosion specimens. This paper describes the influence of the position and location of an exposed surface, evaluates the different development on typical surfaces affected by leaking water and explains the high degree of correlation dependence between measured corrosion loss and average thickness of corrosion products. © 2015 Published by Elsevier Ltd. Source


Halama M.,Technical University of Kosice | Kreislova K.,SVUOM Ltd | Van Lysebettens J.,Ghent University
Corrosion | Year: 2011

Atmospheric corrosion of metals is a complex, nonlinear process. It involves a large number of interacting and varying factors governed by material composition, form, size, testing procedure, location of exposure, and type of application. Possible environmental factors include temperature, relative humidity, wet-dry patterns, hours of sunshine, pH of rainfall, amount of precipitation, concentration of main pollutants, etc. All factors are a part of the variables in artificial neural network (ANN) modeling. The most important variables are chosen from long-term experiences as elements in the development of a prototype "artificial intelligent sensor"-a model designed for the assessment of atmospheric corrosion of carbon steel under local geographical conditions. The variable impact analysis and 2D maps gave accurate prediction of the atmospheric corrosion of carbon steeL Future climatic scenarios, mainly the calculation of mass losses under different simulated concentrations of sulfur dioxide (SO2) during exposure time, are presented. © 2011, NACE International. Source


Krivy V.,VSB - Technical University of Ostrava | Urban V.,VSB - Technical University of Ostrava | Kreislova K.,SVUOM Ltd
Engineering Failure Analysis | Year: 2015

This article introduces the program of experimental atmospheric corrosion test carried out on weathering steel bridges in the Czech Republic. Corrosion losses and average thickness of corrosion products are measured and evaluated within this program. Protective ability of corrosion products is evaluated using X-ray diffraction analysis. Special attention is paid to the surfaces exposed to leakage from a failed drainage system. The test results show that the corrosion losses on structural elements are significantly conditioned by the position and location of exposed surface within the structure. The results also indicate a high degree of correlation dependence between measured average thickness of corrosion products and corrosion loss. © 2015 Elsevier Inc. Source


Kreislova K.,SVUOM Ltd | Geiplova H.,UTAM CET
Materials and Corrosion | Year: 2016

Comparative atmospheric corrosion data for different metal alloys can be used to predict the service life of a component, maintenance requirements, and metal loss to the environment. In some international projects some prediction models have been derived for the atmospheric corrosion rate of metals - dose/response functions (EN ISO 9224, ECE UN ICP program, Multi-Assess project) - including copper alloys. In this paper, actual corrosion studies of two long-term exposed objects - a bronze statue of John of Nepomuk from Charles Bridge and the copper roof of Queen Ann's Summer Palace, are presented. Both these objects are exposed to Prague's urban atmosphere for more than 300 years. The predicted and measured corrosion rates are compared for these cultural objects. During their exposure the corrosion rates changed as the result of changing corrosivity of atmosphere in the Prague centre. © 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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