- Tytuł:
- Impact test of aged polymer coatings on steel substrate
- Autorzy:
- Mayer, P.
- Powiązania:
- https://bibliotekanauki.pl/articles/1189929.pdf
- Data publikacji:
- 2018
- Wydawca:
- Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
- Tematy:
-
powłoki polimerowe
starzenie powłok
badania udarności
polymer coatings
aging of coatings
impact test - Opis:
- 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.
- Źródło:
-
Interdisciplinary Journal of Engineering Sciences; 2018, 6, 1; 1--5
2300-5874 - Pojawia się w:
- Interdisciplinary Journal of Engineering Sciences
- Dostawca treści:
- Biblioteka Nauki
Artykuł