Razvoj in analiza hidrofobnih premazov na aluminijevi zlitini

magistrsko delo

Sandi Skrbinšek (Author), Matjaž Finšgar (Mentor), Lidija Fras Zemljič (Co-mentor), Zdenka Peršin (Co-mentor), Avgust Šibila (Co-mentor)

Abstract

Magistersko delo prikazuje študijo narave silikonskih premazov na aluminijeve zlitine. Ker so se silikoni v preteklosti že dokazali kot cenovno ugodno in uspešno hidrofobno sredstvo smo jih uporabili kot osnovo za premaz na aluminijevo zlitino. Za osnovna nanosa smo uporabili silikon brez dodatka zamreževalca ter polidimetilsiloksan z dodanim zamreževalcem. Izkazalo se je, da sama polimerna nanosa na aluminijevi zlitini že dajeta hidrofobni značaj. Hidrofobnost silikonskih nanosov smo želeli izboljšati, da bi se približali superhidrofobnemu »lotosovemu efektu«. Študijo smo nadaljevali s funkcionalizacijo površine polimernih nanosov. Za funkcionalizacijo smo si pripravili in karakterizirali raztopino SiO2 nanodelcev. Nanodelce smo v različni kombinacijah z heksametildisilazanom, polidimetilsiloksanom in silikonom nanašali z »layer by layer« (plast po plast) nanosi. Opazovali smo stične kote posameznih rezultatov vzorcev. Najbolj perspektiven izmed nanos je bil nanos silikona, kot osnovni premaz, katerega smo funkcionalizirali s SiO2 nanodelci na katere smo dodali plast heksametildisilazana. Z brušenjem površine zlitine, pred posameznimi nanosi smo stični kot še povečali in se približali »lotosovemu efektu«. Pripravljene premaze na zlitinah smo tudi testirali za korozijsko obstojnost. Vzorci so bili 30 dni izpostavljeni 5 % raztopini NaCl. Tukaj je bil najpreskpaktivnješi vzores tudi nanos silikona na brušeno aluminijevo zlitino z dodanimi nanosi SiO2 nanodelcev in heksametildisilazanom kot zaključni sloj. Čeprav je stični kot drastično upadel za 63 %, je ostal edini vzorec, kjer je po korozijskem testu površina ostala gladka (čeprav je površina malo potemnela). Na določenih prespektivnih vzorcih smo opravili tudi SEM analizo.

Keywords

polidimetilsiloksan;silikon;premazi;aluminijeve zlitine;SiO2 nanodelci;heksametildisilazan;magistrske naloge;

Data

Language:	Slovenian
Year of publishing:	2019
Typology:	2.09 - Master's Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[S. Skrbinšek]
UDC:	620.3:669.715(043.2)
COBISS:	22335766
Views:	820
Downloads:	110
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Research and analysis of hydrophobic coatings on aluminium alloy
Secondary abstract:	The masters degree work shows the studies of nature of the silicone coatings on aluminum alloys. It was already proven in the past that silicone is a low cost successful hydrophobic agent, which is used as a basic coating agent for aluminum alloys. As a basic coating agant on aluminium alloy we used silicone without the addition of a crosslinker and polydimethylsiloxane with an added crosslinker. It turned out that both polymeric coatings on aluminum alloy already give a hydrophobic effect. Therefore we tried to improve the hydrophobicity of silicone coatings in order to approach the superhydrophobic "lotus effect". The study continued with the functionalization on the surface of both polymer coating. For polymer functionalization, a solution of SiO2 nanoparticles was prepared and characterized. Nanoparticles were applied in different combinations with hexamethyldisilazane, polydimethyloxane and silicone with "layer by layer" method. We observed the contact angles of individual sample results. The most promising coating was silicone polymer as a primer, which was functionalized with SiO2 nanoparticles on which the layer of hexamethyldisilazane was added. With the fine surface sanding of the aluminium alloy before coating we improved the value of the contact angle and got close to superhydrophobic "lotus effect". Different prepared coatings on aluminium alloys were also tested for corrosion resistance. Samples were exposed to a 5% NaCl solution for 30 days. The most perspective coating here was silicone coated on a pre-sanded aluminum alloy with added SiO2 nanoparticles with a hexamethyldisilazane as a finishing layer. Although the contact angle of the sample was was 63% lower, the sample was the only one which surface remained smooth (just got a little darker color) and undamaged. SEM analysis was also performed on some prespective samples.
Secondary keywords:	polydimethylsiloxane;silicone;coatings;aluminium alloy;SiO2 nanoparticles;hexamethyldisilazane;
URN:	URN:SI:UM:
Type (COBISS):	Master's thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	X, 52 str.
ID:	11080965