Abstract
In this work, the corrosion behavior of γ-TiAl alloy produced by electron beam melting (EBM) process in 3.5% NaCl solution was reported. The study has been performed using potentiodynamic polarization resistance and electrochemical impedance spectroscopy techniques and complemented by scanning electron microscopy investigations. All measurements were carried out after different periods of alloy exposure in the chloride solutions and at different temperatures. The results showed that the EBM produced γ-TiAl alloy has excellent corrosion resistance confirmed by the high values of polarization resistance and the low values of corrosion current and corrosion rate. With increase in immersion time, the corrosion potential moved to a higher positive value with a decrease in corrosion current and corrosion rate, which suggests an improvement in corrosion resistance. On the other hand, the increase of temperature was found to significantly increase the corrosion of the processed γ-TiAl alloy.
Highlights
There has been an increasing demand in the development of intermetallic alloys due to the stringent requirements of using high strength and low weight alloys in the automobile and modern aircraft industries
The corrosion behavior after different periods of exposure in an aerated 3.5% NaCl solution using potentiodynamic polarization measurement of the γ-TiAl alloy, which was produced by electron beam melting (EBM) process, was reported
The values of cathodic Tafel and anodic Tafel slopes, corrosion potential (ECorr), corrosion current density and polarization resistance (Rp) that are listed in Table 1 were obtained as previously reported in our earlier studies [12,13,14]
Summary
There has been an increasing demand in the development of intermetallic alloys due to the stringent requirements of using high strength and low weight alloys in the automobile and modern aircraft industries. Gamma titanium aluminides (γ-TiAl) are intermetallic alloys, proposed to be used in advanced aircraft turbines [1,2,3]. The use of γ-TiAl is preferred in aero-turbine industry because of its other several features. They possess light weight and offer superior creep, oxidation, and burn resistance than other titanium alloys. These alloys have enhanced strength at elevated temperatures. For that it goes without saying that γ-TiAl should have a good resistance to the harsh corrosive environment inside the turbine
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