zaključna naloga univerzitetnega študijskega programa I. stopnje Strojništvo
Žiga Oman (Author), Uroš Trdan (Mentor), Peter Gregorčič (Co-mentor)

Abstract

Lasersko teksturiranje je moderna metoda izdelovanja superhidrofobnih površin, ki imajo posebne lastnosti. V tej nalogi je raziskan prehod iz superhidrofilnega v superhidrofobno stanje površine lasersko teksturiranih vzorcev iz nerjavnega jekla 316L. Hkrati je izvedena podrobna analiza učinkov doseženega stanja na korozijsko odpornost v agresivnem kloridnem okolju. Za teksturiranje smo uporabljali označevalni Nd:YAG laser z valovno dolžino 1048 nm, katerega uporaba je cenejša od femtosekundnih laserjev. Lasersko smo teksturirali 4 vzorce in vsakega za določen čas izpostavili sobni atmosferi, ter spremljali nastanek superhidrofobnosti z meritvami kota omočljivosti ter EDS analizami. Sledili so elektrokemijski korozijski testi s spremljanjem korozijskega potenciala, linearne polarizacijske upornosti in ciklične polarizacije. Intenziteto korozijskih napadov smo ovrednotili s pomočjo kvantitativne analize s programom ImageJ. Analizirali smo delež korozije, krožnost korozijskih pitov, ter kot zasuka od drugega prehoda laserskega žarka. Rezultati elektrokemičnih testov kažejo, da prehod iz superhidrofilnega v superhidrofobno stanje izboljša korozijske lastnosti. Takoj po laserskem teksturiranju je korozijska odpornost najslabša, nato pa se je z razvojem hidrofobnosti izboljševala, kar je potrdila tudi kvantitativna analiza na metalografskih posnetkih korodiranih površin. Ključna ugotovitev naloge je, da je z relativno ceneno metodo laserskega teksturiranja možno izdelati superhidrofobne površine, na katere se kapljica ne prime in imajo izboljšane korozijske lastnosti.

Keywords

diplomske naloge;lasersko teksturiranje;omočljivost;superhidrofobnost;nerjavna jekla;korozijska odpornost;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [Ž. Oman]
UDC: 544.537:669.14.018.8(043.2)
COBISS: 16235291 Link will open in a new window
Views: 1166
Downloads: 293
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Other data

Secondary language: English
Secondary title: Correlation betwen wettability and corrosion properties of laser textured surfaces
Secondary abstract: Laser texturing is a modern method for synthesizing superhydrophobic surfaces that have special properties. In this assignment, the transition from superhydrophilic to superhydrophobic state of surface of laser textured samples from stainless steel 316L was observed. At the same time, a detailed analysis of the effects of the achieved state on the corrosion resistance in an aggressive chloride environment was carried out. For texturing we used the marking Nd:YAG laser with a wavelength of 1048 nm, which is cheaper than femtosecond laser. 4 samples were textured and exposed each for a limited period of time to room atmosphere, and monitor the occurrence of hyperphobicity with contact angle measurements and EDS analisys. The electrochemical corrosion tests followed; the corrosion potential, linear polarization resistance and cyclic polarization. The intensity of corrosion attacks was evaluated using a quantitative analysis with the ImageJ program. We analyzed the relative proportion of corrosion, the circulatrity of corrosion pit, and the angle from the second laser beam transition. The results of electrochemical tests show that the transition from superhydrophilic to superhydrophobic conditions improves corrosion properties. Immediately after laser texturing, the corrosion resistance was the lowest, but with the development of hydrophobicity, it improved, which was also confirmed by the quantitative analysis on metallographic images of the corroded surfaces. The most important synthesis of the task is that with a relatively cheap laser texturing method it is possible to produce superhydrophobic surfaces on which a drop of water does not spill and have improved corrosion properties.
Secondary keywords: laser texturing;wettability;superhydophobicity;stainless steel;corrosion resistance;
Type (COBISS): Final paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za strojništvo
Pages: XIV, 38 f.
ID: 10959636