Studium vlivu koagulace pigmentových nanočástic fosforečnanu-zinečnatého na antikorozní vlastnosti transparentních nátěrových systémů

Abstract

Corrosion protection of metallurgical products is a serious issue with the aim to ensure long term durability of steel structures. Application of water-borne alkyd and acrylic based coating systems seems to supply an efficient corrosion protection. Research and development in the field of protection and quality of the coating systems is continuously moving forward. The main task of the water-borne coating systems is to reduce the total costs, the resulting dry film thickness, the amount of harmful volatile compounds (VOC), and concurrently retain sufficient anti-corrosion and technological properties. However, water-based paint matters have their limitations that can be sufficiently eliminated by the use of nanotechnology in the paint matter production process and application. Nanotechnology extends to all scientific disciplines (medicine, electronics, forming, engineering, etc.) including coatings to protect steel structures. Coating systems can be adjusted in the production process. An easy and advanced progressive solution to adjustment of properties of water-based paint systems is to deliver anticorrosion pigments in the film-forming component of the paint matter. Anticorrosive pigment zinc phosphate (ZP 10) is a suitable choice for improvement of the above-mentioned properties, and also meets the requirement for non-toxicity towards the environment. Admixture of anticorrosive pigment ZP 10 of normal size (of the order of 1 microns) satisfies the short-term protection requirement. Furthermore, disintegration of anticorrosive pigment into submicron sizes can greatly increase the effectiveness of anti-corrosion efficiency of surface coatings. The dissertation thesis is focused on the study of the effect of pigment particle size on the resulting anticorrosion properties of two water-borne alkyd and acrylic based coating systems. Applied "nanopigment" is suitably modified in order to increase the anticorrosion efficiency without causing degradation of the paint matter during application and drying. The results of an extensive set of experimental works enabled us to adjust the two types of water-borne coating systems and significantly prolong their life in demanding corrosive environments.