Prague, Czech Republic


Prague, Czech Republic
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Eremias B.,SVUOM Ltd. | Turek L.,SVUOM Ltd.
METAL 2016 - 25th Anniversary International Conference on Metallurgy and Materials, Conference Proceedings | Year: 2016

For cooling tubes manufactured of aluminized carbon steel with inner surface welded longitudinally the question arises if the anticorrosion quality of Al coating produced on external surface can be influenced by the presence of the weld area on internal surface. In fact this quality is related to Al coating ability to prevent or at least to inhibit the corrosion process occurring during penetration of coating by water environment to the steelcoating interface. Electrochemical noise (EN) measurements provide a set of parameters which can be used to obtain useful information relating to possible impacts of time development of expected active-passive transitions in Al coating on kinetics of the underlying steel corrosion process.

Krivy V.,VSB - Technical University of Ostrava | Urban V.,VSB - Technical University of Ostrava | Kreislova K.,SVUOM Ltd.
Recent Progress in Steel and Composite Structures - Proceedings of the 13th International Conference on Metal Structures, ICMS 2016 | Year: 2016

This paper introduces the program of experimental atmospheric corrosion test carried out on weathering steel bridges in the Czech Republic. Attention is paid to study of corrosion processes at different structural elements of supporting structures of bridges. Measurements of corrosion losses and average thicknesses of corrosion products are carried out within this program. The article presents results of corrosion tests after one year of exposure of corrosion specimens. It results from the tests that corrosion losses of weathering steels are conditioned by position and location of exposed surface within the structure. The results indicate the high degree of correlation dependence between measured average thickness of corrosion products and corrosion loss. Protective ability of corrosion products is evaluated using X-ray diffraction analysis. © 2016 Taylor & Francis Group, London.

Kreislova K.,SVUOM Ltd | Knotkova D.,SVUOM Ltd
Materials | Year: 2017

Atmospheric corrosion poses a significant problem with regard to destruction of various materials, especially metals. Observations made over the past decades suggest that the world's climate is changing. Besides global warming, there are also changes in other parameters. For example, average annual precipitation increased by nearly 10% over the course of the 20th century. In Europe, the most significant change, from the atmospheric corrosion point of view, was an increase in SO2 pollution in the 1970s through the 1980s and a subsequent decrease in this same industrial air pollution and an increase in other types of air pollution, which created a so-called multi-pollutant atmospheric environment. Exposed metals react to such changes immediately, even if corrosion attack started in high corrosive atmospheres. This paper presents a complex evaluation of the effect of air pollution and other environmental parameters and verification of dose/response equations for conditions in the Czech Republic. © 2017 by the authors.

Kubzova M.,VSB - Technical University of Ostrava | Krivy V.,VSB - Technical University of Ostrava | Kreislova K.,SVUOM Ltd.
Procedia Engineering | Year: 2017

The article deals with the influence of atmospheric corrosion and corrosive environment factors on the development of a protective layer of corrosion products of the weathering steel. The main aggressive factors of atmosphere that can negatively affect corrosion rate and the development of corrosion products on the steel surface include sulfates and chlorides. The development of the protective layer of corrosion products on bridge structures designed from weathering steel is monitored by program of experimental atmospheric corrosion tests. Exposed specimens on selected bridges allow to determine the relationship between the thickness of the layer of corrosion products and corrosion losses depending on the time of exposure and local environmental conditions. For the evaluation of protective properties of corrosion layer of the weathering steel indexes PAI is applied. This article presents the part of results of field experimental atmospheric corrosion tests for selected bridge structures in Ostrava. The influence of the amount of chlorides forming insoluble compounds in corrosion products on the protective properties of corrosion layers weathering steel is monitored for these bridges. © 2017 The Authors.

Kreislova K.,SVUOM Ltd.
European Corrosion Congress, EUROCORR 2015 | Year: 2015

The Fe-Ag type Atmospheric Corrosion Monitor (ACM) sensors can be used for monitoring the corrosion rate and corrosivity of various atmospheric conditions in a shorter time than the exposure test according to EN ISO 9223. The correlation between the corrosion rate of carbon steel standard flat specimens and the ACM sensors' output sensors was tested in the Czech Republic in 2013-2014 under outdoor and sheltered conditions at two locations: Prague, and Kopisty, representing urban, respectively industrial environments. Corrosion rates of one month exposure test were plotted as a function of the ACM sensors output to evaluate their relationships. The environmental parameters were measured continually on both atmospheric test sites too.

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.

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.

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. | 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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