MATHEMATICAL MODELING OF THE CORROSION BEHAVIOR OF AUSTENITIC STEELS IN CHLORIDE-CONTAINING ENVIRONMENTS DURING THE OPERATION OF PLATE HEAT EXCHANGERS

Purpose. It consists in the development of mathematical models that describe dependence critical pitting temperatures AISI 304, 08X18N10, 321, 12X18N10T steels model circulating waters with pH 4...8 and chloride concentration from 350 to 600 mg/l.
 Research methods. The developed are based on linear square regression a neural network direct signal propagation for reduced set features.
 Results. was established studied austenitic chrome-nickel increase an water, number oxides up 3.95 μm size, average distance between titanium nitrides, Cr content decrease chlorides oxides, austenite grain diameter.
 Scientific novelty. Based relationships corrosion-resistant 08Х18Н10, 12Х18Н10Т, their chemical composition within standard structural heterogeneity, mechanisms influence resistance these materials chloride-containing have been developed. metastable is formed solid solution around size 1,98...3,95 microns repassivates before reaching dimensions about 5 microns, which contributes growth reversible environments.
 Practical value. proposed be used selection optimal melts production heat exchangers prediction during operation waters. processes contributing perforation transfer elements identified.