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

• Autorzy: Garbacz Marcin

Identyfikatory

DOI

10.36137/1982E

• Języki publikacji: EN

Abstrakty

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.

Słowa kluczowe

EN

neutral salt spray; control charts; within-laboratory reproducibility; interlaboratory reproducibility; bias; metal workpieces; paint coatings

• Wydawca: Instytut Kolejnictwa
• Czasopismo: Problemy Kolejnictwa
• Rocznik: 2023
• Tom: Z. 198
• Strony: 97--117
• Opis fizyczny: Bibliogr. 22 poz., rys., tab.

Twórcy

autor

Garbacz Marcin

• Railway Research Institute, Materials & Structure Laboratory

Bibliografia

• 1. EN ISO/IEC 17025:2017: General requirements for the competence of testing and calibration laboratories.
• 2. EN ISO 9227:2017: Corrosion tests in artifi cial atmospheres – Salt spray tests.
• 3. ASTM B117-19: Standard Practice for Operating Salt Spray (Fog) Apparatus.
• 4. Garbacz M.: Szacowanie niepewności przyspieszonych badań korozyjnych w obojętnej mgle solnej wg ISO 9227 / ASTM B117 w kontekście badań powłok lakierowych oraz detali metalowych realizowanych w akredytowanym Laboratorium Badań Materiałów i Elementów Konstrukcji Instytutu Kolejnictwa [Estimation of the uncertainty of accelerated corrosion tests in neutral salt spray according to ISO 9227 / ASTM B117 in the context of testing varnish coatings and metal details carried out in the accredited Materials and Structures Testing Laboratory of the Railway Institute], Praca dyplomowa w zakresie „Metrologii Chemicznej”, Uniwersytet Warszawski, Wydział Chemii, Warszawa, maj 2019.
• 5. Guide to the Expression of Uncertainly in Measurement (GUM), BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML. International Organization of Standardization, Geneva Switzerland, 1st Edition 1993, Corrected and reprinted 1995. Wydanie polskie: Wyrażanie niepewności pomiarów (Guide to the Expression of Uncertainty in Measurements) – przewodnik, wydanie polskie, Główny Urząd Miar, 1999, www.gum.gov.pl.
• 6. Measurement Uncertainly in Testing. Eurolab Technical Report No. 1/2002.
• 7. Magnusson B. et al.: Handbook for calculation of measurement uncertainty in environmental laboratories, Nordtest Report TR 537 (ed. 4) 2017.
• 8. Biuletyn Informacyjny Klubu POLLAB 2/51/2008, Podręcznik obliczania niepewności pomiaru w laboratoriach środowiskowych, ISSN 1428-6009 (tłumaczenie Nordtest Report TR 537, wersja 3 styczeń 2008).
• 9. Hyk W., Stojek Z.: Analiza statystyczna w laboratorium, wydanie I, Wydawnictwo naukowe PWN, Warszawa, 2016,
• 10. ISO/TS 21748:2004: Guidance to the use of repeatability, reproducibility and trueness estimates in measurement uncertainty estimation.
• 11. EN ISO 10289:2001: Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates – Rating of test specimens and manufactured articles subjected to corrosion tests.
• 12. EN ISO 4628-1:2016: Paints and varnishes – Evaluation of degradation of coatings – Designation of quantity and size of defects, and of intensity of uniform changes in appearance – Part 1: General introduction and designation system.
• 13. EN ISO 4628-2:2016: Paints and varnishes – Evaluation of degradation of coatings – Designation of quantity and size of defects, and of intensity of uniform changes in appearance – Part 2: Assessment of degree of blistering.
• 14. EN ISO 4628-3:2016: Paints and varnishes – Evaluation of degradation of coatings – Designation of quantity and size of defects, and of intensity of uniform changes in appearance – Part 3: Assessment of degree of rusting.
• 15. EN ISO 4628-4:2016: Paints and varnishes – Evaluation of degradation of coatings – Designation of quantity and size of defects, and of intensity of uniform changes in appearance – Part 4: Assessment of degree of cracking.
• 16. EN ISO 4628-5:2016: Paints and varnishes – Evaluation of degradation of coatings – Designation of quantity and size of defects, and of intensity of uniform changes in appearance – Part 5: Assessment of degree of flaking.
• 17. EN ISO 4628-8:2012: Paints and varnishes – Evaluation of degradation of coatings – Designation of quantity and size of defects, and of intensity of uniform changes in appearance – Part 8: Assessment of degree of delamination and corrosion around a scribe or other artifi cial defect
• 18. Shigeru Suga & Shigeo Suga. Report on the results from the ISO/TC156/WG7 International Round Robin Test Programme on ISO 9927 Salt spray tests., J. Surface Finish. Soc. Japan. 2005, 56 p. 28, DOI:10.4139/sfj .56.28.
• 19. ISO 3574:2012: Cold-reduced carbon steel sheet of commercial and drawing qualities.
• 20. Augustyński Ł.: Badania przyspieszone – komora solna i komora wilgotnościowa, Materiały szkoleniowe TUV Rheinland Polska.
• 21. ASTM Research Report RR:A01-1003.
• 22. Fotowicz P.: Obliczanie niepewności rozszerzonej metodą analityczną opartą na splocie rozkładów wielkości wejściowych [Calculation of Expanded Uncertainty by Analytical Method Based on Convolution of Distributions of Input Sizes], Pomiary Automatyka Robotyka, 1/2005.