Effect of High-Temperature Nitriding on the Corrosion Resistance of Ferrite Chromium Steels


High-temperature nitriding with subsequent annealing allows changing the structure and increasing the mechanical properties of the entire volume of thin-walled samples from corrosion-resistant high-chromium ferrite steels without the formation of a continuous nitride layer on the surface. At the same time, the influence of high-temperature nitriding on the corrosion resistance of the steels has not been studied. In this paper, a comparative study of the effect of high-temperature nitriding on the electrochemical corrosion resistance and resistance to prolonged high-temperature oxidation of high-chromium ferrite steels with different content of Cr and V (17Cr–1Ti (AISI 439 type), 25Cr–1Ti (AISI 446 type), and Fe–20Cr–5V) has been carried out. High-temperature nitriding of ferrite steel at a temperature of 1075–1100°C with subsequent heat treatment (annealing at 550°C and annealing at 700°C with/without degassing) provides a different content of Cr and V in a solid solution and changes the corrosion resistance of materials. It is ascertained that high-temperature nitriding has a positive effect on the corrosion resistance of the steels in an aqueous solution of 1 mol/L NaCl + 0.5 mol/L H2SO4, and in an aqueous solution of 3% NaCl, the effect is negative. In this case, the degassing of the samples from their surface leads to a sharp displacement of the steady-state corrosion potential toward electropositive values, which indicates an increase in the corrosion resistance of the materials. The steels investigated are characterized by a high resistance to oxidation at high temperature (700°C for 30 h). For Cr20V5 steel in the initial (non-nitrided) state, the specific weight gain is several times greater than for the other steels. Nitriding with annealing both at a temperature of 550°C and at 700°C significantly increases the resistance of Cr20V5 steel to oxidation.

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Correspondence to S. O. Rogachev or S. A. Nikulin or V. M. Khatkevich or A. O. Cheretaeva or B. E. Bekkaliev.

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Translated by A. Muravev

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Rogachev, S.O., Nikulin, S.A., Khatkevich, V.M. et al. Effect of High-Temperature Nitriding on the Corrosion Resistance of Ferrite Chromium Steels. Inorg. Mater. Appl. Res. 11, 623–628 (2020). https://doi.org/10.1134/S2075113320030399

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  • ferrite corrosion-resistant steels
  • high-temperature nitriding
  • nitrides
  • electrochemical corrosion
  • high-temperature oxidation