Katedra nauky o materialoch

Košice, Slovakia

Katedra nauky o materialoch

Košice, Slovakia
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Kadukova J.,Katedra nauky o materialoch | Marcincakova R.,Katedra nauky o materialoch | Skvarekova E.,Ustav montannych vied a ochrany zivotneho prostredia | Miklos V.,Katedra integrovaneho manazerstva
Koroze a Ochrana Materialu | Year: 2013

Through their metabolic activities microorganisms produce a large variety of products that may contribute to corrosion of different materials, including metals. The goal of this work was to monitor selected factors important in terms of corrosion or bio-corrosion, namely location, soil and the presence of water in four parts of the transit gas line passing through Slovakia, and subsequently to identify the level of risk of bio-corrosion. The analysis results from monitored locations indicated that interms of bio-corrosion, the highest risk was in Zemplínské Hradiští 1 and Slivník trenches located in Eastern Slovakia and in Tomášová 1, 2 and 3 trenches located in the south of Slovakia. © 2013, Versita. All rights reserved.


Bursak M.,Katedra nauky o materialoch | Michel J.,Katedra nauky o materialoch | Janek J.,R.Ø.S.A. | Vojtko M.,Katedra nauky o materialoch
Chemicke Listy | Year: 2011

The contribution analyses a demotion of structure and mechanical properties of low-alloy CrMoV creep resistant steel after 265 000 operating hours by temperature 540 °C and nominal tension 44,8 MPa. Results of structural analysis and realized mechanical tests are exploited for a prediction of residual life cycle of tested steels.


Rosenberg G.,Ustav materialloveho vyskumu | Gasko M.,Ustav materialloveho vyskumu | Sinaiova I.,Ustav materialloveho vyskumu | Halama M.,Katedra nauky o materialoch
Chemicke Listy | Year: 2011

The coating microstructure of the hot-dip zinc galvanized interstitial free steel was investigated by metallographic analysis followed by measurement of the microhardness. Analysis of chemical composition was performed by scanning electron microscopy with energy dispersive X-ray facility (EDX). It was determined that the Fe-Al intermetallic layer in a two-layer arrangement occurs on the steel substrate/Zn interface. In accordance with data reported in the literature, the lower layer in contact with the substrate was a very small compact layer, having thickness of the order of 20∼60 nm and the upper layer comprised larger, around 400 nm in thickness.

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