Materials Reports  2022, Vol. 36 Issue (Z1): 21120217-5 |
| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Structural State on Corrosion Properties of All Metal Fe Based Amorphous Alloys |
| HU Jiafu1, XIE Chunxiao2, TAO Pingjun1
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1 School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
2 College of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, Guangdong, China |
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Abstract (Fe0.52Co0.18Ni0.30)73Cr17Zr10 all-metal Fe-based amorphous alloy was fabricated by means of melt spinning and subjected to different structural relaxation treatments. Vacuum annealing heat treatment for 0 h, 0.5 h, 2 h, 4 h and 10 h at 725 K below the glass transition temperature(Tg=825 K) was carried out so as to obtain amorphous alloys with different structural states.Vacuum crystallization was carried out at 925 K above the glass transition temperature and then holding for 10 min so as to obtain the crystalline (Fe0.52Co0.18Ni0.30)73Cr17Zr10. The phase composition of the samples was tested by XRD, the thermodynamic parameters were analyzed by DSC to obtain the structural relaxation enthalpy (ΔHfv),and then the content of corresponding free volume(V0) was calculated. The electrochemical corrosion resistance in 3.5wt% NaCl solution was tested by electrochemical workstation.The corrosion morphology was observed by SEM and the type and content of elements were tested by EDS. The results show that a certain structural relaxation can reduce the free volume in the amorphous alloy, which makes the atomic stacking closer and the structure more stable so as to improve the uniform corrosion resistance and pitting corrosion resistance, among which structural relaxation for 0.5 h and 2 h has the best effect. The crystalline and long-time structural relaxation will improve the pitting corrosion sensitivity of amorphous alloys, reduce the density of passive film, and aggravate the corrosion.
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Published: 05 June 2022
Online: 2022-06-08
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| Fund:National Natural Science Foundation of China (5217010020). |
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