Abstract
The corrosion behaviour of Ti 3Al and Ti 3Al–11 at.% Nb was studied and compared to Ti with salt fog spray test and electrochemical methods in NaCl, HCl, H 2SO 4 and HNO 3 solutions. The corrosion mechanism of Ti 3Al in salt fog is suggested to be the dissolution of Al and oxidation of Ti. Polarisation curves of Ti 3Al and Ti 3Al–11Nb in 0.5N NaCl and 1.0N HCl solutions showed passive and pitting behaviour. However, Ti 3Al–11Nb showed higher pitting potentials than Ti 3Al, especially in 1.0N HCl solution. Polarisation of Ti, Ti 3Al and Ti 3Al–11Nb in 1.0N H 2SO 4 solution demonstrated passive behaviour. In 1.0N HNO 3 solution, these intermetallics exhibited passive behaviour but without an active region. The addition of 11 at.% Nb to Ti 3Al improves the corrosion and pitting resistance in some acid and neutral chloride solutions. It is believed that the improvement is related to the specific microstructure and composition containing Nb with a high corrosion resistance.
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