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Galvanic zinc coating
Půček, František ; Dvořák, Milan (referee) ; Žák, Ladislav (advisor)
This thesis is based on elaboration and full description of galvanic zinc coating, operations and technologies used in them. The thesis is aimed on analysis of corrosion. How is it formed and how is it spreading. The thesis is also aimed on physical-chemical process which takes place on the surface of coated part during technologies used in galvanic zinc coating. The thesis also emphasize on choosing the right method so we can achieve the best results and good economic conditions. In conclusion the thesis analyzes defections in galvanic zinc layer.
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Design of a device for profiles painting on a pultrusion line
Krejčí, Miloš ; Slaný, Martin (referee) ; Zouhar, Jan (advisor)
Surface treatments of composite materials represent a specific issue in terms of the design of automatic painting equipment. The surface treatment modules were designed to be integrated into an existing pultrusion line, with an emphasis on maintaining the ergonomics of the workplace and adhering to space requirements. The selection of a suitable paint was first made from the coatings available on the market, then continued through collaboration with the manufacturer. The collaboration led to the development of a powdered, thermally curable formulation and a liquid, UV curable formulation. After adhesion tests, an optimised version of the UV formulation was selected. The design of the coating equipment is based on the requirements specific to the selected UV curable formulation. It consists of technologies for UV surface pretreatment, paint application and UV curing of the coating. The surface pretreatment is based on the experience of the supplier of the application technologies and own experiments. Coating application uses spray guns, again selected on the basis of testing in production. Curing of the coating is provided by a set of UV emitters with adjustable output power. Cost savings due to automation of the process and elimination of human labour are insignificant under current conditions due to the high price of the selected coating material. If the predicted production volumes are achieved, the savings can reach up to 10-12 CZK per linear metre of profile.
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CHANGES IN ELECTRICAL STEEL SHEETS INDUCED BY HEAT TREATMENT
Bulín, Tomáš ; Švábenská, Eva ; Hapla, Miroslav ; Ondrušek, C. ; Schneeweiss, Oldřich
Surface coating of electrical steel sheets is very important due to minimizing eddy current losses in electrical machines. The quality of coating can differ according to the composition. The coating layer has limited heat stability and after crossing of the guaranteed temperature it can be significantly degraded and its insulation properties may change importantly. The aim of this study is to describe changes in parameters of magnetic behavior of the non-oriented Si electrical steel sheet due to degradation of the coating by annealing in air. The parameters were acquired from the measuring of magnetic hysteresis loops on two types of samples with different excitation. The basic information on structure was obtained by optical microscopy. Acquired data are compared between samples with the damaged coating layer by annealing and the original coating layer. The results are discussed from the point of view of the possibility of using sheets with damaged insulation in electrical machines.
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CHANGES IN ELECTRICAL STEEL SHEETS INDUCED BY HEAT TREATMENT
Bulín, Tomáš ; Švábenská, Eva ; Hapla, Miroslav ; Ondrušek, C. ; Schneeweiss, Oldřich
Surface coating of electrical steel sheets is very important due to minimizing eddy current losses in electrical machines. The quality of coating can differ according to the composition. The coating layer has limited heat stability and after crossing of the guaranteed temperature it can be significantly degraded and its insulation properties may change importantly. The aim of this study is to describe changes in parameters of magnetic behavior of the non-oriented Si electrical steel sheet due to degradation of the coating by annealing in air. The parameters were acquired from the measuring of magnetic hysteresis loops on two types of samples with different excitation. The basic information on structure was obtained by optical microscopy. Acquired data are compared between samples with the damaged coating layer by annealing and the original coating layer. The results are discussed from the point of view of the possibility of using sheets with damaged insulation in electrical machines.
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Galvanic zinc coating
Půček, František ; Dvořák, Milan (referee) ; Žák, Ladislav (advisor)
This thesis is based on elaboration and full description of galvanic zinc coating, operations and technologies used in them. The thesis is aimed on analysis of corrosion. How is it formed and how is it spreading. The thesis is also aimed on physical-chemical process which takes place on the surface of coated part during technologies used in galvanic zinc coating. The thesis also emphasize on choosing the right method so we can achieve the best results and good economic conditions. In conclusion the thesis analyzes defections in galvanic zinc layer.
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