Prague, Czech Republic
Prague, Czech Republic

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Halama M.,Technical University of Košice | 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.


Krivy V.,VSB - Technical University of Ostrava | Marek P.,Westbohmische University in Pilsen | Kreislova K.,SVUOM Ltd. | Knotkova D.,SVUOM Ltd.
Stahlbau | Year: 2013

The corrosion rate of the weathering steel is considerably lower than that of the standard carbon steel. Nevertheless possible effects of corrosion losses on reliable service of the structure throughout the designed service life should be considered when designing the structures. In practice, the effects of the expected corrosion losses are typically eliminated by corrosion allowances which are added to the thickness of the element calculated in static analyses. This paper introduces a new method used for calculation of corrosion allowances on weathering steel bridges. This will be explained using an example of a bridge structure. © Ernst & Sohn;.


Kreislova K.,SVUOM Ltd. | Geiplova H.,SVUOM Ltd.
Procedia Engineering | Year: 2012

Paper presents the results of failure analysis of corrosion protection of steel bridges including evaluation of microclimate corrosivity and critical areas of bridge steel constructions during their service life. Microclimate around the road is higher mainly due to high deposition of chlorides from de-icing salts. This effect is not found to be significant only in winter season but during whole year. The durability of corrosion protection is affected even in project period when the design details may be inappropriate from the point of application or maintenance of corrosion protection. © 2012 Published by Elsevier Ltd.


Krivy V.,VSB - Technical University of Ostrava | Kreislova K.,SVUOM Ltd | Urban V.,VSB - Technical University of Ostrava
Solid State Phenomena | Year: 2015

The paper introduces the experimental corrosion tests that are carried out on the existing weathering steel bridges in the Czech Republic. The influence of the position and location of the surface in the structure on the resulting corrosion rates can be evaluated using this experimental testing. Typical surfaces of steel bridges are tested, e.g. webs of main girders, upper and lower surfaces of flanges, surfaces affected by leaking salt solutions. The corrosion tests to study the relation between steel grade (weathering steels S355J2WP and S355J2W) and corrosion rates are introduced in this paper as well. © (2015) Trans Tech Publications, Switzerland.


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.


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.


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.


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.


Kreislova K.,SVUOM Ltd | Mindos L.,SVUOM Ltd | Geiplova H.,SVUOM Ltd | Parakova M.,SVUOM Ltd
Materials Science Forum | Year: 2016

All industries are interesting in the durability/service life of products, structures, equipment, plants, etc. One factor affecting this is corrosion resistance. There are many methods for received such data. Methods supporting standardized data are long-term atmospheric corrosion tests, mapping of corrosivity, field tests on real structures including the evaluation of long-term exposed materials and coatings. The choice of suitable accelerated test is very important for receiving the reasonable information. © 2016 Trans Tech Publications, Switzerland.


Kreislova K.,SVUOM Ltd. | Dusek P.,SVUOM Ltd.
METAL 2014 - 23rd International Conference on Metallurgy and Materials, Conference Proceedings | Year: 2014

Technical standards are developed by a panel of experts, within a technical committee in frame of various standardisation organisations. The most important are ISO and ESS - the European standardization system (ESS) comprises the three recognised European Standards Organisations (ESOs) - CEN, CENELEC and ETSI. There are many technical committees or subcommittees for evaluation and testing of corrosion and corrosion protection, for each type of corrosion protection (paint systems, metallic coatings, cathodic protection, vitreous coatings, conversion coatings, ⋯), e.g. ISO/TC 156, ISO/TC 107, ISO/TC 35, CEN/TC 139, CEN/TC 219, CEN/TC 240 and CEN/TC 262. In Czech Republic the activity of all these TC are covered by TNK 32. The paper presents the most important news in this technical standards' development during last 2 years. From their large number the most important standards (newly developed or significantly changed) are mentioned in details.

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