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The Influence of Microstructure on the Passive Layer Chemistry and Corrosion Resistance for Some Titanium-Based Alloys
Abstract
The effect of microstructure and chemistry on the kinetics of passive layer growth and passivity breakdown of some Ti-based alloys, namely Ti-6Al-4V, Ti-6Al-7Nb and TC21 alloys, was studied. The rate of pitting corrosion was evaluated using cyclic polarization measurements. Chronoamperometry was applied to assess the passive layer growth kinetics and breakdown. Microstructure influence on the uniform corrosion rate of these alloys was also investigated employing dynamic electrochemical impedance spectroscopy (DEIS). Corrosion studies were performed in 0.9% NaCl solution at 37 °C, and the obtained results were compared with ultrapure Ti (99.99%). The different phases of the microstructure were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Chemical composition and chemistry of the corroded surfaces were studied using X-ray photoelectron spectroscopy (XPS) analysis. For all studied alloys, the microstructure consisted of α matrix, which was strengthened by β phase. The highest and the lowest values of the β phase’s volume fraction were recorded for TC21 and Ti-Al-Nb alloys, respectively. The susceptibility of the investigated alloys toward pitting corrosion was enhanced following the sequence: Ti-6Al-7Nb < Ti-6Al-4V << TC21. Ti-6Al-7Nb alloy recorded the lowest pitting corrosion resistance (Rpit) among studied alloys, approaching that of pure Ti. The obvious changes in the microstructure of these alloys, together with XPS findings, were adopted to interpret the pronounced variation in the corrosion behavior of these materials
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Authors (11)
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Nader El-bagoury
- Taif University Department of Chemistry
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Sameh Ahmed
- Taif University Department of Chemistry
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Ola Ahmed Abu Ali
- Taif University Department of Chemistry
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Shimaa El-hadad
- Central Metallurgical Research and Development Institute
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Ahmed Fallatah
- Taif University Department of Chemistry
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G.a.m. Mersai
- South Valley University Chemistry Department
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Mohamed Ibrahim
- Kafrelsheikh University Chemistry Department
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Rabah Boukherroub
- University Lille CNRS
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Mohammed Amin Prof.
- Taif University Department of Chemistry
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
Materials
no. 12,
pages 1 - 20,
ISSN: 1996-1944 - Language:
- English
- Publication year:
- 2019
- Bibliographic description:
- El-Bagoury N., Ahmed S., Abu Ali O., El-Hadad S., Fallatah A., Mersai G., Ibrahim M., Wysocka J., Ryl J., Boukherroub R., Amin M.: The Influence of Microstructure on the Passive Layer Chemistry and Corrosion Resistance for Some Titanium-Based Alloys// Materials. -Vol. 12, iss. 8 (2019), s.1-20
- DOI:
- Digital Object Identifier (open in new tab) 10.3390/ma12081233
- Verified by:
- Gdańsk University of Technology
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