OBTAINING HIGHLY EFFECTIVE PROTECTIVE COATINGS IN SHS OPERATING IN AN AGGRESSIVE ENVIRONMENT

摘要

For machines and units operating in corrosive environments, an important characteristic is corrosion resistance. To increase the corrosion resistance it is necessary to saturate the surface layer with elements that will form passive skin. In our case, when the ionic passivation potential is reached, oxide films are formed, with the following composition - Cr_2O_3, Al_2O_3, TiO_2, SiO_2, which protect the metal from destruction. Coatings were tested in 30% acid solutions HCl and H_2SO_4. When tested in a 30% solution of hydrochloric acid (HCl), the best resistance was shown by chromium-aluminum-silicified and chromium-alumina-titanated coatings having correspondingly weight loss values of 18,8 and 16,7 g/m2. Comparative analysis of corrosion resistance of protective coatings obtained in isothermal conditions showed that they have a weight loss of 1.7-2,1 times more.