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| Corrosion Behavior of Ti60 Alloy in Fog of NaCl Solution at 600 ℃ |
LI Rui1, CUI Yu1,2, LIU Li1( ), FAN Lei3, MENG Fandi1, WANG Fuhui1 |
1.Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3.State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an 710077, China |
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Abstract The corrosion behavior of Ti60 alloy in fog of NaCl solution at 600 ℃ has been characterized by mass gain measurement, scanning electron microscopy (SEM), X-ray diffractometer (XRD) and electron probe microanalyzer (EPMA). The results suggested that the corrosion rate of Ti60 alloy in fog of NaCl solution is much lower than that with solid NaCl deposit in H2O+O2 atmosphere after 100 h corrosion at 600 ℃. The corrosion products formed in fog of NaCl solution are of two layer-structure, the inner layer consists of TiO and Ti2O, while the outer one TiO2 and Na2TiO3. The fog of NaCl solution is rich in O2 and water vapor, which should be favor thermodynamically for the stable existence of TiO2 oxide, further for the formation of dense oxide scale of TiO2, therefore, the corrosion rate of the alloy in the fog of NaCl solution is reduced. In addition, Cl concentrated in the inner layer of the corrosion products, and might accelerate the corrosion of Ti60 alloy in accord with "active oxidation" mechanism.
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Received: 10 October 2020
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| Fund: National Key R&D Program of China(2017YFB0702303) |
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Corresponding Authors:
LIU Li
E-mail: liuli@mail.neu.edu.cn
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About author: LIU Li, E-mail: liuli@mail.neu.edu.cn
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