Materials Reports 2021, Vol. 35 Issue (z2): 399-403 |
METALS AND METAL MATRIX COMPOSITES |
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Passivation Behavior of Co1.5CrFeNi1.5Mo0.5Ti0.5 in 3.5% NaCl Solution with Different pH Values |
TIAN Yongqiang1,2, YUAN Qingying1,2, FU Anqing3 , HE Shilei1,2, ZHOU Xinyi1,2, WANG Qiang1,2, YANG Xiaolong1,2, CHEN Haoming1,2
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1 Chinese National Engineering Research Center for Petroleum and Natural Gas Tubular Goods, Baoji 721008, China 2 Baoji Petroleum Steel Pipe Co., Ltd., Baoji 721008, 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 IIn order to study the passivation behavior of Co1.5CrFeNi1.5 Mo0.5Ti0.5 in 3.5% NaCl acid solution with different pH values. Cobalt (Co), chromium (Cr), titanium (Ti), iron (Fe) and nickel (Ni) with a purity of more than 99wt% were melted in a vacuum induction furnace. The microstructure of Co1.5CrFeNi1.5 Mo0.5Ti0.5 alloy was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS). The passivation behavior of Co1.5CrFeNi1.5 Mo0.5Ti0.5alloy in 3.5% NaCl acid solution with different pH values was studied by potentiodynamic polarization, electrochemical impedance spectroscopy, potentiostatic polarization and XPS analysis. The results show that the phase structure of Co1.5CrFeNi1.5 Mo0.5Ti0.5 is a single fcc structure, and its microstructure is dendrite structure; Co1.5CrFeNi1.5-Mo0.5Ti0.5 alloy has strong passivation ability in different pH 3.5% NaCl acid solution, and its corrosion resistance is enhanced with the increase of pH value; the composition of passivation film mainly includes Cr2O3, Cr(OH)3, Co3O4, MoO3, NiO, Fe2O3, Fe3O4, TiO2.
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Published: 09 December 2021
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Fund:This work was financially supported by the Youth Science Fund Project of National Natural Science Foundation of China(21908250). |
About author:: Yongqiang Tian, engineer, master's degree, graduated from Xi'an Shiyou University in 2020, worked in Petro China Baoji Steel Pipe Co., Ltd. in the same year. He mainly engaged in oil well pipe research and development. |
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