Vpliv staranja na površinske lastnosti lasersko teksturiranih in kemijsko modificiranih površin

Sever, Tina (author), Svenšek, Daniel (mentor), Conradi, Marjetka (co-mentor)

V zaključni nalogi predstavljam rezultate trimesečnega opazovanja sprememb omočitvenih lastnosti različnih lasersko teksturiranih vzorcev nerjavnega jekla AISI 316L. Spremljala sem omočljivost lasersko teksturiranih vzorcev brez nanosov ter z nanosi epoksidne smole in epoksidne smole z nanovključki FAS-TiO2 pri sobnih pogojih ter pri zmanjšanima zračnem tlaku in vlagi. Z meritvami kontaktnih kotov vodnih kapljic sem določila omočitvene lastnosti površin ter njihovo površinsko energijo. Z optično profilometrijo in vrstično elektronsko mikroskopijo sem analizirala hrapavost in morfologijo površin različno obdelanih vzorcev. Rezultati so pokazali, da lahko superhidrofobnost jekla dosežemo posredno s staranjem lasersko teksturirane površine z ustreznimi parametri ali pa neposredno z nanosi epoksidne smole z nanovključki FAS-TiO2. Zračna tlak in vlaga vplivata na spremembe omočljivosti lasersko teksturiranega jekla brez nanosov, na omočitvene lastnosti lasersko teksturiranih vzorcev z nanosi pa nimata vpliva. Pokazala sem, da je laserska obdelava učinkovita metoda za modifikacijo morfologije površin in s tem njihove omočljivosti.

• Language: Slovenian
• Keywords: jeklo AISI 316L, lasersko teksturiranje, polimerne prevleke, morfologija, omočljivost
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FMF - Faculty of Mathematics and Physics
• Year: 2018
• PID: 20.500.12556/RUL-101645
• COBISS.SI-ID: 3211876
• Publication date in RUL: 23.06.2018

Secondary language

• Language: English
• Title: Influence of aging on surface properties of laser textured and chemically modified surfaces

Abstract

This work presents the results of a three-month observation of wetting properties of differently laser-textured stainless steel AISI 316L. The samples were prepared uncoated, coated with epoxy resin, and with epoxy resin composite with inlcusion of FAS-TiO2 nanoparticles. The measurements were performed on samples kept under ambient conditions, and in conditions with reduced air pressure and humidity. Static water contact angles were measured and surface energy was calculated to evaluate surface wetting properties. Optical profilometry and scanning electron microscopy were used to analyze the roughness and morphology of laser-textured steel surfaces. The results have shown that superhydrophobicity of steel can be achieved either indirectly by aging the appropriately laser-textured surface, or directly by application of the epoxy resin composite with FAS-TiO2 nanoparticles. Ambient conditions have a significant impact on changes of wettability of laser-textured steel without coatings, but they do not affect the aging of additioanlly coated surfaces. I have shown that laser processing is an effective method for modifying surface morphology and, consequently, its wettability.

• Keywords: steel AISI 316L, laser texturing, polymer coatings, morphology, wettability