NDLI: A Study on the Passivation Behavior and Semiconducting Properties of Gamma Titanium Aluminide in 0.1 N H$_{2}$SO$_{4}$, HNO$_{3}$, and HClO$

Content Provider	Springer Nature Link
Author	Memarbashi, S. Saebori, E. Shahrabi, T.
Copyright Year	2013
Abstract	The study focuses on the passivation behavior of single-gamma-phase titanium aluminide in acidic solutions with a particular emphasis on the role of oxidizing strength in characteristics of passive layer. The report includes potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) studies along with Mott-Schottky analysis in order to determine the corrosion behavior of the alloy and the semiconducting properties of the scale formed during exposure to acidic environment. Passive current density measured from potentiodynamic polarization curve, polarization resistance (R $_{p}$) estimated by EIS, defect density, and flatband potential drawn from Mott-Schottky analysis are mainly used in estimating the ability of passive film formed on alloy in protecting it against high corrosion rates in Sulfuric acid (a non-oxidizing acid), perchloric acid, and nitric acid (oxidizing acid with different oxidizing strength). The results show that passive current density (i $_{pass}$) in Sulfuric acid is 2.67 × 10$^{−5}$ A cm$^{−2}$, which is 2.5 and 3 times greater than the values obtained in perchloric acid (i $_{pass}$ = 9.91 × 10$^{−6}$) and nitric acid (i $_{pass}$ = 7.98 × 10$^{−6}$), respectively. EIS data reveal that the value of R $_{p}$ in sulfuric acid (20 kΩ cm$^{2}$) is about three and five times smaller than that its value in perchloric acid and Nitric acid, respectively. Mott-Schottky analysis shows that the passive layer exhibits an n-type semiconducting characteristics irrespective of acidic environment. The greatest and the smallest values of donor density (N $_{D}$) are obtained for the passive scale formed in sulfuric acid (N $_{D, H2SO4}$ = 18.36 × 10$^{19}$) and nitric acid (N $_{D, HNO3}$ = 13.13 × 10$^{19}$), respectively. The report concludes that characteristics of the passive scale are directly affected by reduction potential of the acid, which is the criterion of its oxidizing strength. An increase in the oxidizing strength of the acidic solution results in formation of more protective and less conductive layer on γ phase titanium aluminide.
Starting Page	912
Ending Page	917
Page Count	6
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	23
Issue Number	3
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2013-12-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	EIS gamma titanium aluminide Mott-Schottky analysis passive metal Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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