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Effects of the Zr and Mo contents on the electrochemical corrosion behavior of Ti–22Nb alloy
Author(s) -
Yang S.,
Zhang D. C.,
Wei M.,
Su H. X.,
Wu W.,
Lin J. G.
Publication year - 2013
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201106478
Subject(s) - alloy , dielectric spectroscopy , materials science , corrosion , microstructure , quenching (fluorescence) , electrochemistry , polarization (electrochemistry) , metallurgy , phase (matter) , analytical chemistry (journal) , electrode , chemistry , physics , organic chemistry , quantum mechanics , chromatography , fluorescence
Ti–22Nb– x Zr and Ti–22Nb– x Mo ( x = 0, 2, 4, 6, in atom percent) were prepared by an arc melting method. The alloys were solution‐treated at 1073 K for 1.8 ks followed by quenching them into ice water, and the electrochemical corrosion behavior in a 0.9% NaCl solution at 25 °C and neutral pH range of the solution‐treated alloys was evaluated by using electrochemical impedance spectroscopy, polarization curves and an equivalent circuit analysis. It was found that the microstructure of the solution‐treated Ti–22Nb alloy mainly contains β phase with small amount of α″ phase, and the addition of Zr or Mo to a Ti–22Nb alloy is efficient to stabilize the β phase. The resulting impedance parameters and passive current densities indicated that the corrosion resistance of the Ti–22Nb alloy was promoted significantly with the addition of Zr and Mo.