THE INFLUENCE OF THE LAYERED STRUCTURE OF POLYMER COATINGS ON THEIR EROSIVE RESISTANCE

摘要

The paper presents the results of erosive resistance investigation of three-layer epoxy coating systems with different compositions of surface layers. This layer was modified with glass microspheres or nanoparticles of aluminium trioxide or silica. The highest erosive resistance, in the whole thickness range of examined epoxy coatings, was revealed by coating systems with a surface layer (top coat) modified using nanoparticles of aluminium trioxide. Similar but slightly lower erosive resistance was reported in the case of surface layer modification with nanoparticles of silica use. High erosive resistance of coating systems modified with nanoparticles results from their structure reinforcement by nanoparticles that seal nanopores generated during the process of coating constitution. The lowest erosive resistance was observed in the case of systems with a surface layer modified using glass microspheres. This results from high brittleness of glass microspheres, which is evident during the coating surface bombardment with alundum particles. The paper demonstrates the methods for the analysis of the interaction between lubricant and steel substrate and presents the obtained results. The samples to be tested were commercially available greases as well as greases developed for the purpose of this research, containing a known amount of adhesion additives. Due to the lack of normalized methods, the authors applied indirect methods based on the analysis of the peel resistance and the resistance to variable shearing rates. The obtained results reveal that there is a possibility to apply the proposed methods for the comparative assessment of interactions between the grease and steel substrate.