Badania udarności starzonych powłok polimerowych na podłożu stalowym

• Autorzy: Mayer P.

Warianty tytułu

EN

Impact test of aged polymer coatings on steel substrate

• Języki publikacji: PL

Abstrakty

PL

Obiekty techniczne podczas eksploatacji narażone są na destrukcyjne oddziaływanie środowiska, w którym się znajdują. Potrzeba rozwiązania tego problemu była główną przyczyną opracowania i stosowania powłok ochronnych, które wydłużą czas życia danych obiektów technicznych. W pracy przeprowadzono badania udarności wybranych powłok polimerowych, nałożonych na podłoże stalowe, które były poddane procesom starzenia. Badaniom poddano powłoki poliuretanowe, polimocznikowe i polimocznikowo-poliuretanowe, które narażone były na działanie promieniowania UV, środowiska kwaśnego oraz zmiennych temperatur. Po procesie starzenia powierzchnie powłok analizowano pod mikroskopem stereoskopowym oraz wyznaczono grubość powłok. W zależności od rodzaju powłoki oraz wypływu różnych czynników środowiskowych zaobserwowano zmiany w odporności na uderzenia.

EN

Technical objects, during operation, are exposed to the destructive impact of the environment in which they are located. The need to solve this problem was the main reason for the development and use of protective coatings, which will extend the lifetime of given technical facilities. The impact tests of selected polymer coatings applied to the steel substrate, which underwent aging processes, were performed in the work. Before applying the coatings, the steel substrate was subjected to abrasive blasting using as an abrasive an electrocorund with grain granulation F30. The roughness was measured on the profilometer by the contact method, determining the arithmetic mean deviation of the roughness profile - Ra and the roughness height by 10 points - Rz. Polyurethane, polyurea and polyurea-polyurethane coatings were subjected to tests, which were exposed to UV radiation, acidic environment and variable temperatures. Biresin® U1305 and Almacoat Floor SL polyurethane coatings, after mixing the ingredients in the right proportions, were applied by hand using a brush. The Almacoat Protect C coating, in accordance with the manufacturer's recommendations, was sprayed with a pneumatic gun. Accelerated aging using UV radiation was carried out for 3 weeks. The samples were placed in a chamber equipped with two T8 fluorescent lamps with a capacity of 18 W and two T8 fluorescent lamps with a power of 36 W, which emitted radiation from the UV-A range with a wavelength of 350 ÷ 400 nm. Aging of coatings in a 5% NaCl solution also took place over a period of 21 days. The samples were completely immersed in the solution and stored at room temperature. On the other hand, aging at variable temperatures consisted of subjecting the coatings to alternating high (+ 60 ° C) and low (-18 ° C) temperatures for 3 cycles, one cycle being 5 changes at 1 hour at low and high temperatures. After the aging process, the coating surfaces were observed under a stereoscopic microscope and the coating thickness was determined. Depending on the type of coating and the outflow of various environmental factors, changes in impact resistance were observed. Among the coatings tested, the highest impact strength was obtained for polyurea-polyurethane coatings (Protect C). Analyzing the effect of individual factors, UV radiation had the least impact on the deterioration of the impact strength of coatings, although the changes in appearance were significant. However, the aging of polyurethane and polyurea-polyurethane coatings in the NaCl solution reduces the impact resistance twice.

Słowa kluczowe

PL

powłoki polimerowe; starzenie powłok; badania udarności

EN

polymer coatings; aging of coatings; impact test

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Interdisciplinary Journal of Engineering Sciences
• Rocznik: 2018
• Tom: Vol. 6, no. 1
• Strony: 1--5
• Opis fizyczny: Bibliogr. 13 poz., rys., tab., wykr.

Twórcy

autor

Mayer P.

• Politechnika Wrocławska, Wydział Mechaniczny, Katedra Odlewnictwa, Tworzyw Sztucznych i Automatyki, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw

Bibliografia

• [1] Kotnarowska D., Wojtyniak M.: Methods for testing the quality of protective coatings Radom University of Technology Publisher, Radom 2010, s. 9-11.
• [2] Yeh J-M. Chang K-C.: Polymer/layered silicate nanocomposite anticorrosive coatings. Journal of Industrial and Engineering Chemistry 2008, 14, 275-291.
• [3] Chattopadhyay D.K., Raju K.V.S.N.: Structural engineering of polyurethane coatings for high performance applications, Progress in Polymer Science 2017, 32, 352-418.
• [4] Przerwa M.: The influence of climatic factors on the surface condition of polyurethane and epoxy coatings, TRANSCOMP - XIV International Conference Computer Systems Aided Science, Industry and Transport, Logistics 2010, 6, 2811- 2817.
• [5] Tekalur S.A., Shukla A., Shivakumar K.: Blast resistance of polyurea based layered composite materials, Composite Structures 2008, 84, 271- 281.
• [6] Xue L., Mock W., Belytschko T.: Penetration of DH-36 plates with and without polyurea coating, Mechanics of Material 2010, 942, 81-103.
• [7] Roland C.M., Fragiadakis D., Gamache R.M.: Elastomer-stell laminate armor, Composite Structures 2010, 92, 1059-1064.
• [8] Hallmann L., Ulmer P., Mreusser E., Hanmerle C.: Effect of blasting pressure, abrasive particle size and grade on phase transformation and morphological change of dental zirconia surface, Surface & Coatings Technology 2012, 206, 4293-4302.
• [9] Zhang T., Bao Y., Gawne D.T., Mason P.: Effect of a moving flame on the temperature of polymer coatings and substrates, Progress in Organic Coatings 2011, 70, 45-51.
• [10] Gnatowski A., Kwiatkowski D., Nabiałek J., Studies on the influence of UV aging on the properties and structure of PA 6.6 composites with glass fibers, Composites 2010, 10, 3, 240- 243.
• [11] Boubakri A., Geurmazi N., EAlleuch K., Ayedi H., Study of UV–aging of thermoplastic polyurethane material, Materials Science and Engineering A 2010, 527, 1649-1654
• [12] Bartolomeo P., Irigoyen M., Aragon E., Frizzi M., Perrin F., Dynamic mechanical analysis and Vickers micro hardness correlation for polymer coating UV ageing characterisation, Polymer Degradation and Stability 2001, 72, 63-68.
• [13] Hu J., Li X., Gao J., Zhao Q., Ageing behavior of acrylic polyurethane varnish coating in artificial weathering environments, Progress in Organic Coatings 2009, 65, 504-509.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).