This study is focused on the development of effective antimicrobial surface treatment of wooden furniture and materials based on wood. The research was performed with acrylic dispersed water-borne and two-component acryl-urethane varnishes. Treatment of varnishes based on chlorhexidine, phthalocyanines and plant extracts and the effect of unfinished wood itself were tested for assessment of antimicrobial activity. The assessment of how safe water-borne varnishes which contain biocides for in-can preservation actually are, was also evaluated in the scope of this thesis. Testing of the antimicrobial efficacy was performed according to a standard routine method and the European and Japanese standards (Agar diffusion plate test, JIS Z 2801 and EN 15457). In addition, a new method testing the antibacterial activity under dry conditions simulating the contamination by microorganisms carried on dust particles was developed. Moreover, the method suitable for testing of photocatalytic active substances simulating the real use of products was described. The appearance and physical and mechanical characteristics were tested in the final treatment of varnishes.

The thesis deals with the analysis of corrosion resistance of machinery used in wastewater treatment plants. The theoretical part of the thesis deals with the composition of waste water in terms of corrosion aggressiveness and describes the corrosive en-vironment in the WWTP. Furthermore, the types of corrosion are characterized and the exposed machinery of the WWTP with the highest level of corrosion is determined. The experimental part of the work is devoted to the analysis of corrosion resistance of corrosion-resistant austenitic steels and structural non-alloyed steels with duplex zinc coating and acrylate paint. Furthermore, structural low-alloyed steels with chemical-heat treatment by nitriding and ferritic nitrocarburizing in gas and structural non-alloyed steel with duplex system of phosphate + epoxy coating and zinc + epoxy coating are analysed as a possible replacement for stainless steels. The steels with duplex system of zinc + acrylate coating used in practice show little corrosion resistance (the first signs of corrosion after 12 h and 24 h). some chemical-heat treated steels and steel with duplex sys-tem of zinc + epoxy coating achieved the same corrosion resistance as stainless steels (264 h test time) and can be used in technical practice.