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Hot dip galvanizing of the steel construction
Pometlo, Stanislav ; Vyplašil, Evžen (referee) ; Kubíček, Jaroslav (advisor)
This master´s thesis deals with hot dip galvanizing of steel constructions and their protection from corrosion. This work describes the origin of corrosion of steel and its corrosion in different areas and presents degreasing and pickling before hot dip galvanization. It describes possibilities of making zinc layer by the wet and draw method of hot dip galvanization. Furthermore, it puts forward reactions between zinc and iron, possible defects of the zinc layer and influence of the hot dip galvanizing on the steel constructions. The experimental part examines the influence of the hydrogen charging on the material and the time of the flux operation on the quality of layer. The work further analyses the changing of mechanical properties of steels Hardox 500 and Weldox 700 as a result of the hydrogen embrittlement during pickling by the hydrochloric acid.
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Anticorrosive modification of electric motors surface
Vlčková, Irena ; Straková, Monika (referee) ; Gráf, Jiří (advisor)
This Master´s thesis is devoted to the basic theory from semester project. There are describe completed practical tests, measurements and results. This project was written below patronage of company Siemens s.r.o. odštěpný závod Elektromotory Mohelnice, which is at the same time also my employer. There is production of asynchronous electromotors frame size 56 to 200. On the all of electromotors is desired quality surface treatment with difference on the base of request of customers.
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Optimisation of a die casting part production.
Vencálek, Jaroslav ; Janský, Milan (referee) ; Píška, Miroslav (advisor)
The project aim is an optimalization of production of pressure die casting, which serves as a one part of handle in office furniture area. The main emphasis was for mass finishing operation, which serves for rounding of very sharp part edges after die casting operation. A few tests of single mass finishing parameter was carried out and as result was a few partial recommendations for an increasing of production efficiency and improving of manufacturing process, namely an adjustment of separation cycle, proposal of optimum amount of pieces in each single batch and an innovation of chips type and dimensions. The project includes a proposal of a new and more efficiency layout of pieces on the transport pallet.
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Surface treatments in light industry
Dokoupilová, Dita ; Vyplašil, Evžen (referee) ; Kubíček, Jaroslav (advisor)
The bachelor thesis, written in the subjekt B2341 within the bachelor study, deals with analysis of application of powder plastics. The powder coating is a plastic layer technology used on metal materials. The main aim is a corrosion protection. The thesis contains an analysis of particual surface pre-treatments methods suitable for powder coating, the description of several color systems, the chemical analysis of the powder colours being used today and the typical opportunities of use. This thesis includes also the description of the setting process and several types of baking ovens.
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Plasma Chemical Surface Treatment of Polymeric Materials for Biomedical Applications
Mikušková, Radka ; Kozáková, Zdenka (referee) ; Krčma, František (advisor)
The theoretical part of bacalor thesis summarizes a plasma application for surface modification of materials used for biomedical applications. The main focus is on polymeric materials. Practical part focuses on specific surface modifications. An aim is to obtain from the initially hydrophobic surface hydrophilic by plasma chemical surface treatment and to optimize the method. Hydrophilicity is achieved by treating the sample in low temperature low pressure plasma generated in air based gaseous mixtures. The surface treatment efficiency is characterizad by water leak through the material. Structural changes of material surface are confirmed by X-ray photoelectron spectroscopy.
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Reliability of Lead-free Solders and the Selected Methods to Estimate its Lifetime
Švecová, Olga ; Kolařík, Vladimír (referee) ; Urbánek,, Jan (referee) ; Šandera, Josef (advisor)
The doctoral thesis is focused on reliability of lead-free solder SAC 305. Knowledge in the field of fatigue models used in determining the lifetime of solder joints are observed in this thesis. Also such methods of predicting reliability as numerically-analytical methods or reliability experimental tests are mentioned. Practical results of reliability measurement are presented. Experimental data served as the foundation for determining empirical coefficients for the fatigue model based on deformation induced by creep of the solder, which was implemented in the ANSYS environment. Results from different methods were compared and conclusions discussing the suitability of the presented prediction methods are formulated.
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Surface treatments of parts internal combustion engines
Toman, Josef ; Novotný, Pavel (referee) ; Maršálek, Ondřej (advisor)
This bachelor thesis is a professional research dedicated to the most frequently used surface treatments, applied to the stressed parts of internal combustion engines. The thesis also refers to surface treatments classification, benefits for the automotive industry and reasons for their development. Further it focuses on definitions of the technologies used, characteristics of processes and coatings, finishing operations after surface treatments and application of these treatments on the parts of internal combustion engines.
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Testing of service life of the bolt fastening used in electron microscopy
Habarka, Ondrej ; Radoš, Jiří (referee) ; Krejsa, Jiří (advisor)
Cílem této bakalářské práce je vybrat vhodný materiál a jeho povrchovou úpravu pro šroubový spoj s jemným závitem na držáku vzorku v elektronovém mikroskopu. První částí je přehled použitelných materiálů a povrchových úprav, které jsou nemagnetické, tudíž neovlivňují elektronový paprsek v mikroskopu. Dále se práce zabývá tvorbou testovacího zařízení na testování životnosti jednotlivých vzorků závitových tyčí. Výsledkem práce je porovnání testovaných materiálů a výběr jednoho nejvhodnějšího pro reálné použití.
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Design of measurement unit for analysis of surface materials properties
Kratochvíl, Robert ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
The thesis deals with the application of laser beams for examination of material properties. The properties being examined are quality of surface finish and transmissivity of materials in the optical portion of the electromagnetic spectrum. A measuring device containing laser diodes as a source of laser beam and photodiodes for evaluation of examined phenomena serves for examination of both properties. Conversion of the signal to digital quantity and its further processing take place in a microcontroller. The data is then sent via a serial bus and a converter to a computer, where it may be saved in a user program and where the user can work with them later. The thesis contains results of reflectivity measurement of a set of metal samples with different surface finish. Transmissivity measurement was applied on a set of optical filters.
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Corrosion resistance of surface treatments by polysiloxane paint systems.
Kulhanová, Veronika ; Molliková, Eva (referee) ; Tulka, Jaromír (advisor)
Influence of atmospheric and chemical environments on metal products leads usually to the corrosion damage. This master´s thesis deals with way to protect metals from corrosion, especially by polysiloxane coatings in combination with coatings containing zinc. Corrosion resistance of created coatings systems is tested by laboratory accelerated tests in corrosion chamber, where the natural atmospheric conditions are simulated. Chemical resistance in selected environments is verified by drop test. Quality characteristics coatings – thickness, adhesion to the underlying material, hardness and stability of the coating colour and gloss are evaluated too.
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