Wyniki wyszukiwania - BazTech

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Estimating the Uncertainty of the Result for Tests of Resistance to Environmental Conditions on the Example of the Method of Resistance to Neutral Salt Mist According to EN ISO 9227 / ASTM B117

Garbacz Marcin

Problemy Kolejnictwa

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2023

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Z. 198

97--117

EN

Environmental laboratory tests are one of the most frequently performed tests to evaluate materials used, among others, for the construction of rail vehicles. The requirements of the EN ISO/IEC 17025 standard for research laboratories, particularly when evaluating the compliance of materials with the specified requirements, impose on laboratories the need to consider the results of final measurements along with the uncertainties of these results. Due to the complexity of the physical and chemical processes occurring during environmental tests, determining the sources of uncertainty of the measurement result can be very complicated. The article presents one of the methods of estimating the complex uncertainty for environmental tests on the example of corrosion tests using the NORDTEST TR 537 concept of uncertainty estimation. The article presents an exemplary method of uncertainty estimation based on a set of empirical data obtained in an accredited Laboratory for Testing Materials and Structural Elements of the Railway Institute with the use of within-laboratory reproducibility and method bias. Examples of uncertainty estimation depending on the type of tested objects (metal details and paint coatings) and the method of their evaluation after corrosion tests (quantitative and qualitative methods) are presented. The article also briefl y presents the possibilities of interpreting and processing the obtained data as part of the control carried out inside the laboratory on the basis of a simple statistical tool such as Shewhart control charts and the Ishikawa diagram for the method of determining corrosivity in salt chambers, identifying important factors influencing the measurement uncertainty and at the same time showing the complexity the entire research process.

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Influence of Laboratory Ageing on the Preservation of Anti-graffiti Properties for Paint Systems Used in Rolling Stock

Garbacz Marcin

Problemy Kolejnictwa

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2022

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Z. 195

97--116

EN

The article describes and presents the influence of selected ageing mechanisms of paint systems currently used in railways in Poland in the context of maintaining their original protective properties against graffiti. Six paint systems with different types of finish, which had anti-graffiti properties, were tested, and the characteristics of the surface of the paint system, such as gloss and colour, were determined after a series of painting and cleaning of graffiti (markers and sprays). The tested objects were subjected to artificial simulated ageing using laboratory solar radiation in a synergistic combination of temperature and humidity in accordance with PN-EN ISO 16474-2 and in accordance with the proprietary methodology described in DN 001/08/A2/16 section 4.1.8 using the UV-C radiation source (discrete spectrum). The tested samples were also subjected to a different type of ageing mechanism under strong corrosive conditions in the form of neutral salt spray according to the methodology described in PN-EN ISO 9227.

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Odporność korozyjna w obojętnej mgle solnej azotowanej stali S355

Tacikowski J., Michalski J., Wach P., Filipowicz M., Wojucki M.

Inżynieria Powierzchni

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2017

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nr 4

62--67

PL

W artykule omówiono wyniki badań realizowanych w projekcie „TANGO: „Innowacyjne warstwy azotowane nowej generacji o podwyższonej odporności korozyjnej wytwarzane na elementach maszyn”. Celem projektu było m.in. opracowanie technologii azotowania antykorozyjnego przemysłowych zawiasów drzwiowych wykonanych ze stali S355. Zawiasy drzwiowe i próbki kontrolne azotowano w procesach regulowanego azotowania gazowego w temperaturze 570oC przez 5 h. Zastosowane parametry umożliwiły uzyskanie warstwy azotowanej z warstwą azotków żelaza  + ( + ’). W artykule wykazano, że warstwa azotków żelaza  + ( + ’) impregnowana inhibitorem korozji ma bardzo dobrą odporność na korozję w atmosferze obojętnej mgły solnej, a także ma dobrą odporność na zużycie przez tarcie.

EN

The article discusses the results of the research carried out in the "TANGO" project: "Innovative nitrided layers of a new generation with increased corrosion resistance produced on machine elements". The goal of the project was, among others, to an anti-corrosive nitriding technology for industrial door hinges made of S355 steel. Door hinges and control samples were nitrided in controlled gas nitriding processes at 570oC for 5 hours. The applied parameters made it possible to obtain a nitrided layer with a layer of iron nitrides  +( +’). The article shows that the layer of iron nitrides  +( +’) impregnated with a corrosion inhibitor has a very good corrosion resistance in a neutral salt spray atmosphere and also good resistance to friction wear.