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Effect of SiO2 Coating Combined with Chemical Treatment by Phosphoric Acid on Oxidation Resistance of Ti-6Al-4V Alloy |
REN Bao-yi1, LIU Zi-ru2, GAO Yan-hui1, ZHANG Xue-jun1 |
1. College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China;
2. GE-HE Wind Energy (Shenyang) Co., Ltd., Shenyang 110168, China |
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Abstract The effects of phosphoric acid chemical treatment and composite SiO2 coating on oxidation resistance of Ti-6Al-4V alloy were investigated. Results show that, the average oxidation rate of the Ti-6Al-4V alloy treated by phosphoric acid decreases nearly by 75% in comparison with the blank samples at 600℃ after 24h oxidation in air. The oxidation rate of composite SiO2 coating sample reduces one order of magnitude in comparison with the blank sample oxidation for 100h at the same condition. The composite SiO2 coating has better anti-oxidation ability than phosphoric acid treatment. The compactness of the oxide scale of the composite SiO2 coating and the phosphoric acid treatment samples increases, and a good adhesion with the substrate is shown, the volume fractions of TiO2 in oxidation films reduce both phosphoric acid chemical treatment and composite SiO2 coating samples. The in-diffusion of O and out-diffusion of Ti are restrained because of the formation of TiP2O7 phase and deposit SiO2 coating.
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Received: 05 March 2012
Published: 20 May 2013
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