Study of corrosion behaviour of TiNi alloy with high Ni content with different microstructure in acid solutions

The article considers the corrosion behavior of the Ti49.1Ni50.9 alloy with an austenitic structure in coarse-grained and ultrafine-grained states in acid solutions of various concentrations with a holding time of 12 to 96 hours according to GOST 9.905-2007. The most significant corrosion damage is observed in the coarse-grained state in a 3 M H2SO4 solution, while even a long exposure time does not cause obvious corrosion damage in the ultrafine-grained state. Using scanning electron microscopy by analyzing energy dispersive spectroscopy corrosion products were studied.