STUDY OF PROPERTIES THIN COATINGS CONTENT SMALL PARTICLES

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1 STUDY OF PROPERTIES THIN COATINGS CONTENT SMALL PARTICLES Tomáš LANÍK a, Jitka PODJUKLOVÁ b, Kateřina PELIKÁNOVÁ c, Kamila HRABOVSKÁ d, Karla BARABASZOVÁ e, Vratislav BÁRTEK f, Lenka DOBROVODSKÁ g, Vladimír Viktorovič MENŠIKOV h, Richard DVORSKÝ i a VŠB TU Ostrava, 17. listopadu 15, Ostrava-Poruba, ČR, tomas.lanik.st@vsb.cz b VŠB TU Ostrava, 17. listopadu 15, Ostrava-Poruba, ČR, jitka.podjuklova@vsb.cz, c VŠB TU Ostrava, 17. listopadu 15, Ostrava-Poruba, ČR, d VŠB TU Ostrava, 17. listopadu 15, Ostrava-Poruba, ČR, kamila.hrabovska@vsb.cz, e VŠB TU Ostrava, 17. listopadu 15, Ostrava-Poruba, ČR, karla.barabaszova@vsb.cz, f VŠB TU Ostrava, 17. listopadu 15, Ostrava-Poruba, ČR, vratislav.bartek.st@vsb.cz, g h VŠB TU Ostrava, 17. listopadu 15, Ostrava-Poruba, ČR,, i VŠB TU Ostrava, 17. listopadu 15, Ostrava-Poruba, ČR, richard.dvorsky@vsb.cz Abstract All metal and non-metal materials enclose their surface, which is in contact with Environment. Character of surface has a large influence on adhesion of protective paint system. Surface of background material has to be modified before application of protective coating. At the first like a mechanical surface finish treatment is using blasting. Important is also complete degreased by immersion of surface material. These technologies remove impurities from surface of material, create acceptable anchor pattern, makes better adhesion and corrosive protection of paint systems. Experimental works are aim at study on surface finish material and application of thin coating. Paint system is content by zinc-phosphate particles in nano and micro size. Experiments are intent on classification anticorrosive protection of thin coating. The using of particles nanosizes has influence on properties of protective coatings. Development of organic coating respects decreases VOC matters with using water like solvent components. Keywords: surface finish material, thin coating, nanoparticles, microparticles, anticorrosive resistance 1. EXPERIMENTAL WORK The experimental works are aim at study of influence roughness surface of steel material on applied paint system content of small particles ZP 10. Paint systems are on base of alkyd resin. As a anticorrosive pigment was used zinc phosphate in micro size and nano size. The surface of test materials were differently prefinishing with differently roughness of surface (blasting grit, blasting copper slag, cold rolling, cut and hot rolled tubes). 2. BACKGROUND MATERIALS Before application of paint systems was measured surface roughness all types of surfaces. Measurements was takes by use of touch profilometer Mitutoyo Surftest 301, according by standard ČSN EN ISO The measured values are processed in graph. 2.1 Surfaces of background materials On picture No. 1 are SEM pictures of individual surfaces, provide by Scanning Electron Microscope Philips XL-30 Series, Nanotechnology Center, VŠB-TU Ostrava.

2 , Olomouc, Česká Republika a) b) c) d) e) Obr. 1. Photographic documentation of surfaces background materials a) Blast surface steel grit G (80x magnification), b) Blast surface copper slag S (50x magnification), c) Cold-rolled steel V (50x magnification), d) Ground surface B (80x magnification), e) Hot-rolled seamless pipe T (350x magnification)

3 2.2 Graphic presentation of average values roughness of surfaces background materials Graf 1. Comparison of average roughness of background materials 3. APPLICATION OF PAINT SYSTEMS On steel surfaces were applied paint systems with low content of particles ZP10. The content of zinc phosphate in paint systems about particle sizes was in range 3 until 5 % in micro size and 0,1 until 2 % in nano size. Content of particles was determine by experimental theoretically calculation with assumption, that the particles cover surface of steel substrate and fill dry thickness of paint system in ¼. The dry thickness of paint systems was round 50 µm. Paint systems are intended for short-time anticorrosive protection. Obr. 2. Photographic documentation of particles ZP10 a) particles ZP10 about sizes 3 5 µm (3500x magnification), b) agglomeration of particles ZP 10 about size 4x100x200 nm (5000x magnification)

4 3.1 Corrosion tests in artificial atmospheres Salt spray tests according to the ČSN EN ISO 9227 Obr. 3. Photographic documentation of samples before insert to the Corrosion chamber a) paint system with micro particles ZP10, b) paint system with nano particles ZP10 Obr. 4. Photographic documentation of samples after 120 hours in Corrosion chamber a) paint system with micro particles ZP 10, b) paint system with nano particles ZP CONCLUSSION Presumption is, that 720 hours of exposition in the Corrosion chamber matches 10 years of corrosive protection about the aggression of corrosion C5. For short-time protection, that is 6 months, has to resist

5 paint system 36 hours in Corrosion chamber about the aggression of corrosion C5. This assumption realized paint system stuffed nano particles ZP10 on all background materials. With next exposition corroding samples with paint systems in Corrosion chamber. Paint system stuffed with nano particles ZP10, applied on background material from hot-rolled pipe, resist 120 hours in Corrosion chamber. That is 20 months short-time anticorrosive protection in real environment C5. Paint system stuffed with nano particles ZP10, applied on background material from Cold-rolled steel, after 120 hours exposition in Corrosion chamber showed corrosion only in cut without next diffusion and degradation of paint system. First appearance of corrosion paint system, content of nano particles ZP10 and applied on blast surface of copper slag and steel grit, was after 48 hours exposition in Corrosion chamber. This corrosion attack can be faster of secondary contamination surface with blast medium. Paint system with particles ZP10 in nano size had higher corrosive resist than paint system with particles ZP10 in micro size. Charecter, surface roughness and cleanness of surface are very important factors, which influencing corrosive resist of applied thin-film paint systems. LITERATURE [1] DOBROVODSKÁ, L. Influence of Surface Roughness of Steel Substrate on the Properties of Coatings with small Particles. Ostrava, p. Doctoral work, Faculty of Mechanical Engineering VŠB-TU Ostrava, Department of Mechanical technology. Head of Doctoral work doc. Ing. Jitka Podjuklová, Csc. [2] PELIKÁNOVÁ, K. Study of Influence Character Surface of Background Material and Input Components on Adhesion of Protective Coatings. Ostrava, pages with supplements. Doctoral work, Faculty of Mechanical Engineering VŠB-TU Ostrava, Department of Mechanical technology. Head of Doctoral work doc. Ing. Jitka Podjuklová, Csc. The contribution was elaborated as a part of the project MŠMT KONTAKT ME 08083