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Materials Science and Engineering of Powder Metallurgy >

2023 , Vol. 28 >Issue 5: 490 - 499

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2023061

Engineering and Technology

Effect of preparation process on corrosion resistance properties of powder metallurgy FeCrNi medium entropy alloy

  • HU Haixia ,
  • LIU Yong ,
  • HUANG Qianli
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  • Powder Metallurgy Research Institute, Central South University, Changsha 410083, China

Received date: 2023-05-24

  Revised date: 2023-08-29

  Online published: 2023-11-22

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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 words： powder metallurgy; hot extrusion; hot press sintering; grain size; corrosion resistance

Cite this article

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 . DOI: 10.19976/j.cnki.43-1448/TF.2023061

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