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Materials Science and Engineering of Powder Metallurgy  2023, Vol. 28 Issue (5): 490-499    DOI: 10.19976/j.cnki.43-1448/TF.2023061
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Effect of preparation process on corrosion resistance properties of powder metallurgy FeCrNi medium entropy alloy
HU Haixia, LIU Yong, HUANG Qianli
Powder Metallurgy Research Institute, Central South University, Changsha 410083, China
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Abstract  FeCrNi medium entropy alloys were prepared by canned hot extrusion and hot press sintering technology, respectively. The effects of preparation process on microstructure and corrosion resistance of FeCrNi alloy were studied. The results show that the average grain size of FeCrNi medium entropy alloy prepared by hot extrusion is 13 μm with coarse annealing twins, while the average grain size of FeCrNi medium entropy alloy prepared by hot press sintering is smaller, and the average grain size is 6 μm. FeCrNi medium entropy alloy prepared by hot press sintering shows good corrosion resistance in 0.5 mol/L H2SO4+2×10-6 mol/L HF solution, that is a higher breakdown potential (0.979 V), a lower corrosion current density (7.68×10-6 A/cm2), and a wider passive zone ΔE (1.011 V). Cr element in the passive film of FeCrNi by hot extrusion is mainly in the form of Cr(OH)3, while Cr element in the passive film of FeCrNi by hot press sintering is mainly in the form of Cr2O3. This is because the high density grain boundaries of the fine crystal structure provide more diffusion channels for Cr, and then promote the formation of Cr2O3 in the passive film, and improve the stability and corrosion resistance of the passive film.
Key wordspowder metallurgy      hot extrusion      hot press sintering      grain size      corrosion resistance     
Received: 24 May 2023      Published: 22 November 2023
ZTFLH:  TB31  
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HU Haixia
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HU Haixia,LIU Yong,HUANG Qianli. Effect of preparation process on corrosion resistance properties of powder metallurgy FeCrNi medium entropy alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(5): 490-499.
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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023061     OR     http://pmbjb.csu.edu.cn/EN/Y2023/V28/I5/490
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