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The influence mechanism of Fe 3+ on corrosion behavior of Ti6 A l4 V in sulfuric acid solutions
Author(s) -
Wang L.,
Cheng X. Q.,
Gao S. J.,
Li X. G.,
Zou S. W.
Publication year - 2015
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.201307380
Subject(s) - x ray photoelectron spectroscopy , passivation , valence (chemistry) , materials science , titanium , sulfuric acid , dielectric spectroscopy , corrosion , inorganic chemistry , electrochemistry , titanium alloy , polarization (electrochemistry) , oxide , alloy , chemical engineering , metallurgy , chemistry , electrode , composite material , organic chemistry , layer (electronics) , engineering
The corrosion behavior of titanium alloy Ti6Al4V in 44.6 wt% sulfuric acid solutions, was studied via potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), Mott–Schottky and X‐ray photoelectron spectroscopy (XPS) techniques. The results indicated that the Fe 3+ played an important role in the passivation and stability of the passive film formed on Ti6Al4V. When the concentration of Fe 3+ reached to 0.001 M, the hydrogen evolution reaction (cathodic process) was remarkably influenced, the anode process of the corrosion reaction changed from active state to passivation state, and it showed an enormous increase of the impedance values ( R c ) with the capacitive arc varying from two to one. XPS results showed that as the concentration of Fe 3+ increased, there were less intermediate valence oxides Ti 2 O 3 and more stable valence oxides TiO 2 . Fe 3+ made more intermediate valence titanium ions or instability titanium oxides transformed into stable valence oxides, which enhanced the stability of the passive film.