Thermal properties of coatings based on full aluminosiloxane polymer

Abstract

This article is devoted to the study of thermal properties, heat resistance, corrosion resistance and fire resistance of new protective coatings based on the filled aluminosiloxane polymer. The aim of the study is to determine the effect of the source composition on the physical properties of the finished coating. Thermal stability was determined by periodic heating in a thermal chamber to a temperature of 800 °C for 5 h and then cooled in water. Corrosion resistance was determined by the change in roughness. Profiles and profilometers were used to determine the roughness parameters. Fire resistance was determined by the time from the start of the test to the onset of one of the normalized boundary states. It is set, that to improve the heat resistance of steel structures it is expedient to use appropriate coatings based on full aluminosiloxane polymer which contain Al2O3, ZrO2, kaolin, kaolin fiber and modifier TiO2 as fillers. The heat resistance of protective coatings for steel decreases by 20%-30% when kaolin is added at a heating temperature higher than 753 K. The heat resistance is increased by 30%-40% when kaolin fiber is added. Depth of corrosion of materials with developed protective coatings decreases by 2.2-3.5 times. The results of the study confirm that the introduction of kaolin in the coatings increases the fire resistance of the studied materials. Thus, the performance properties of the protective coatings can be adjusted over a wide temperature range by changing the oxide and silicate fillers.