Abstract: For parts 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 – Cr2O3, Al2O3, TiO2, SiO2, which protect the metal from destruction. Coatings were tested in 30% acid solutions HCl and H2SO4.When tested in a 30%solution of hydrochloric acid (HCl), the best resistance was shown by chromium-aluminium-silicified and chromium-alumina-titanated coatings having correspondingly weight loss values of 18,8 and 16,7 g/m2. When tested in a 30% solution of sulfuric acid (H2SO4), all the protective layers are as well resistant to chromium-alumino-borated 11,74 g /m2, chromium-aluminosiliconized 10,84 g/m2, chromo-alumina-titanated – 12,4 g/m2.
Authors: Borys Sereda, Dmytro Sereda, and Irina Kruglyak
Keywords: Self Propagating High-Temperature Synthesis, Corrosion Resistance, Protective Coatings, Brass