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.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Lakhtin, Yu.M., High-temperature nitriding, Met. Sci. Heat Treat., 1991, vol. 33, nos. 1–2, pp. 124–130.
Sung, J.H., Kong, J.H., Yoo, D.K., On, H.Y., Lee, D.J., and Lee, H.W., Phase changes of the AISI 430 ferritic stainless steels after high-temperature gas nitriding and tempering heat treatment, Mater. Sci. Eng., A, 2008, vol. 489, pp. 38–43.
Yoo, D.K., Lee, H.J., Kang, C.Y., Kim, K.H., Kim, Y.H., and Sung, J.H., A study on nitrogen permeation and tempering heat treatment of AISI type 409L ferritic stainless steel, Solid State Phenom., 2006, vol. 118, pp. 149–154.
Rogachev, S.O., Nikulin, S.A., Terentiev, V.F., Khatkevich, V.M., Prosvirnin, D.V., and Savicheva, R.O., Effect of internal nitriding on the fatigue strength of ferritic corrosion-resistant steel, Russ. Metall. (Engl. Transl.), 2015, vol. 2015, no. 4, pp. 332–337.
Nikulin, S.A., Rogachev, S.O., Khatkevich, V.M., and Rozhnov, A.B., Structure and hardness of corrosion resistant ferritic steels subjected to high temperature nitriding, Phys. Met. Metallogr., 2014, vol. 115, no. 2, pp. 186–191.
Batrakov, V.V., Batrakov, V.P., Pivovarova, L.N., and Sobol’, V.V., Korroziya konstruktsionnykh materialov. Gazy i neorganicheskie kisloty. Kniga 2. Neorganicheskie kisloty (Corrosion of Structural Materials. Gases and Inorganic Acids, Book 2: Inorganic Acids), Moscow: Metallurgiya, 1990.
Nagai, I.N., Tomashov, N.D., Seledtsov, D.K., and Kochergina, V.M., Corrosion resistance of metallic materials in bromine, Zashch. Met., 1981, vol. 17, no. 5, pp. 530–537.
Rogachev, S.O., Nikulin, S.A., and Khatkevich, V.M., Evolution of the structure and mechanical properties of a bulk-nitrided corrosion-resistant ferritic steel upon tempering in the temperature range of 400–700°C, Phys. Met. Metallogr., 2017, vol. 118, no. 8, pp. 782–787.
Nikulin, S.A., Khatkevich, V.M., Rogachev, S.O., Denisenko, K.S., and Nechaikina, T.A., Structure and mechanical properties of Fe–Cr–V alloy alloyed with nitrogen from the gas phase by high-temperature nitriding, Fiz. Khim. Obrab. Mater., 2016, no. 2, pp. 52–57.
Natradze, A.G., Aronson, Yu.P., and Rozanova, Yu.M., Zashchita ot korrozii v khimiko-farmatsevticheskoi promyshlennosti (Corrosion Protection in Chemical-Pharmaceutical Industry), Moscow: Meditsina, 1974.
Babakov, A.A. and Pridantsev, M.V., Korrozionnostoi-kie stali i splavy (Corrosion-Resistant Steels and Alloys), Moscow: Metallurgiya, 1971.
Nikulin, S.A., Khatkevich, V.M., Rogachev, S.O., Bekkaliev, B.E., and Belov, V.A., Long-term annealing resistance of ferritic chromium steels subjected to high-temperature nitriding, Russ. Metall. (Engl. Transl.), 2019, vol. 2019, no. 4, pp. 427–430.
Translated by A. Muravev
About this article
Cite this article
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
- ferrite corrosion-resistant steels
- high-temperature nitriding
- electrochemical corrosion
- high-temperature oxidation