Oxidation and electrochemical corrosion performance of Ti<DN>3</DN>Al alloy with TiAl coating

Yan Jun Xi; Yong Jun Liu; Zhi Xin Wang; Jin Bin Liu

doi:10.1108/00035591011009682

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Anti-Corrosion Methods and Materials

ISSN: 0003-5599

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Oxidation and electrochemical corrosion performance of Ti3Al alloy with TiAl coating

Document Information:
Title:	Oxidation and electrochemical corrosion performance of Ti3Al alloy with TiAl coating
Author(s):	Yan Jun Xi, (School of Material and Chemical Engineering, Zhong Yuan University of Technology, Zhengzhou, China), Yong Jun Liu, (School of Material and Chemical Engineering, Zhong Yuan University of Technology, Zhengzhou, China), Zhi Xin Wang, (School of Material and Chemical Engineering, Zhong Yuan University of Technology, Zhengzhou, China), Jin Bin Liu, (School of Material and Chemical Engineering, Zhong Yuan University of Technology, Zhengzhou, China)
Citation:	Yan Jun Xi, Yong Jun Liu, Zhi Xin Wang, Jin Bin Liu, (2010) "Oxidation and electrochemical corrosion performance of Ti3Al alloy with TiAl coating", Anti-Corrosion Methods and Materials, Vol. 57 Iss: 1, pp.13 - 17
Keywords:	Alloys, Coatings, Electrochemical corrosion, High temperatures, Oxidation resistance
Article type:	Research paper
DOI:	10.1108/00035591011009682 (Permanent URL)
Publisher:	Emerald Group Publishing Limited
Abstract:	Purpose – The purpose of this paper is to investigate the high-temperature oxidation behavior in air at 900-1,000°C and electrochemical corrosion performance in 3.5 percent NaCl solution of Ti-24Al-17Nb-0.5Mo (at. %) alloy with Ti-48Al-8Cr-2Ag (at. %) coating. Design/methodology/approach – Laboratory tests are performed to determine the effect of the Ti-48Al-8Cr-2Ag (at. %) coating on the corrosion performance of Ti3Al alloy. Findings – It is found that the oxidation rate of sputtered Ti-48Al-8Cr-2Ag nanocrystalline coating is lower than that of the Ti3Al alloy at 900°C. The former forms a scale of merely Al2O3 and the latter forms a scale of TiO2. However, the Ti-48Al-8Cr-2Ag nanocrystalline coating shows a slightly higher oxidation rate than did the Ti3Al alloy at 1,000°C, because outer TiO2 scale forms and columnar boundaries of the coating give a larger actual oxidation area than the original alloy. The coating shows the excellent electrochemical corrosion resistance in 3.5 percent NaCl solution because it exhibits stable passive polarization behavior without any overpassivation phenomena. Originality/value – TiAlCrAg coatings may become a promising protective coating for Ti3Al-base intermetallics, which improve the Al2O3 scale formation and make the passivation stable.