RT Journal Article
T1 Hindering the decrease in wear resistance of UV-exposed epoxy powder coatings by adding nano-SiO2 through ball milling
A1 Fernández Álvarez, María
A1 Velasco López, Francisco Javier
A1 Torres Carrasco, Manuel
A1 Bautista Arija, María Asunción
AB The wear resistance of organic coatings has an important role in order to extend their in-service life. Epoxy powder coatings were mixed with nanosilica through ball milling to study their effect on the wear performance after ultraviolet (UV) exposure. Two types of SiO2 nanoparticles were added: hydrophilic (HL) and hydrophobic (HB) at different percentages (0.25–1% by wt.). Modified powders were applied by electrostatic spraying gun on carbon steel sheets. After curing, coatings were exposed to a xenon lamp for 500 h. The surface of coatings was analyzed by scanning electron microscope (SEM). Reciprocating sliding wear tests were performed at room temperature and dry conditions, under 5 N load and 10 Hz frequency. The countermaterial was a 6 mm-stainless steel ball. Wear tracks were analyzed by an optoelectronic microscope and SEM. In order to analyze possible chemical changes, attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) was performed. Finally, universal hardness was evaluated to study mechanical properties. Results reveal that small amounts of both types of nanosilica, make the epoxy-matrix coatings chemically degrade less than non-reinforced ones under irradiation, increasing their mechanical behavior and thus wear resistance. The 0.75-1HL and the 0.75HB coatings exhibit the best wear performance after UV exposure.
PB Elsevier
SN 0043-1648
YR 2021
FD 2021-09-15
LK https://hdl.handle.net/10016/32838
UL https://hdl.handle.net/10016/32838
LA eng
NO The authors acknowledge Universidad Pontificia Comillas and Cubson International Consulting for their support with the ATR-FTIR tests and with the organic coating process respectively. Funding by Interreg SUDOE, through the KrEaTive Habitat project [grant number SOE1/P1/E0307], is also acknowledged.
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RD 3 may. 2024