COMPARATIVE ANALYSIS OF THE CORROSION BEHAVIOR OF TINI ALLOYS WITH AUSTENITIC AND MARTENSITIC MICROSTRUCTURES

Abstract

The work was devoted to the study of the corrosion behavior of TiNi alloys with the initial austeniticand martensitic structure in various states. In the course of the research, it was found that the rateof corrosion destruction of coarse-grained and ultrafine-grained Ti49.0Ni51.0 alloys was different: thecoarse-grained alloy turned out to be less corrosion resistant than the ultrafine-grained one. X-rayphase analysis of TiNi alloys revealed that as a result of corrosion processes in an aqueous solutionof NaCl and H2SO4, the phase composition of TiNi alloys changes, accompanied by the formationof titanium nickelide hydride – TiNiH1.4. In the ultrafine-grained state, the volume fraction of theformed hydride was higher than in the coarse-grained state. This is typical for both TiNi alloys;however, in the alloy with the initial martensitic structure, the volume fraction of TiNiH1.4 was higherthan with the austenitic one.