Corrosion Protection of Materials

Relationship Between the Limit Potentials of 06KHN28MDT Alloy and its Characteristics in a Chloride-Containing Medium

Anna Dzhus, Oleksii Narivskyi, Andriy Pashchenko, Dmytro Voskoboinikov

National University Zaporizhzhia Polytechnic, Ukraine

https://doi.org/10.15407/msse2025.01.144

PDF DocumentPDF

Keywords

crevice corrosion of 06KhN28MDT alloy, prediction of crevice corrosion resistance of 06KhN28MDT alloy, repassivation and free corrosion potentials and their calculation

Abstract

Mathematical models based on regression trees have been developed to establish the relationship between the repassivation potentials Erep and free corrosion Ecor of 06KhN28MDT alloy in a gap with a chloride-containing medium and its chemical composition and structure. It was found that the Erep potential shifts to the positive side by 192.4 mV with an increase in the Cr content from 23.12 up to 23.68 wt.%, and Ecor reaches the most negative value (-0.4557 V) with a decrease in the Cr and Mn content. Reducing the mean austenite grain diameter to 11 μm reduces Erep to 0.287 V. Mathematical models allow us to select optimal melts to increase the resistance of heat exchangers to crevice corrosion.

References

  1. Narivs’kyi O.E. Micromechanism of corrosion fracture of the plates of heat exchangers // Mater. – 2007. – 43 – P. 124–132. https://doi.org/10.1007/s11003-007-0014-3
  2. Narivs’kyi O.E. Corrosion fracture of plate-like heat exchanger // Mater. Sci. – 2005. – 41. 122–128. https://doi.org/10.1007/s11003-005-0140-8
  3. RTM-26-01-88 Guiding technical material. Methods of corrosion testing of metal materials. Basic requirements. Evaluation of results. Moscow: VNIIkhimmash. – 1989. – 22 p. [in Russian]
  4. Narivskyi O.E. Influence of the heterogeneity of AISI-321 steel on its pitting in chloride-containing media // Mater. Sci. – 2007. – 43. – P. 256–264. https://doi.org/10.1007/s11003-007-0029-9
  5. Mishchenko V.G., Snizhnoi G.V., Narivs’kyy O.Eh. Magnetometric investigations of corrosion behavior of AISI 304 steel in chloride-containing environment // Metallofiz. Noveish. Tekhnol. – 2011. – 33. – P. 769–774.
  6. Bolfrouh A., Masson C., Vouagner D. and et al. The cumulative effect of alloying elements N, W, Mo and Cu on the corrosion behavior of 17Cr-13Ni stainless steel in 2 N H2SO4 // Corrosion science. – 1996. – 38 (10). – P. 1639–1648. https://doi.org/10.1016/S0010-938X(96)00033-9
  7. Dzhus A.V., Narivskyi O.E., Subbotin S.A., Pulina T.V., Snizhnoi G.V., Leoshchenko S.D. The Influence of the Components of the 06KhN28MDT Alloy (Analogue of AISI904L Steel) and the Parameters of the Model Chloride-Containing Recycled Water of Enterprises on Its Pitting Resistance // Metallofiz. Noveish. Tekhnol. – 2024. – 46 – P. 371–383. https://doi.org/10.15407/mfint.46.04.037
  8. Gerasimov, V.V. Prediction of metal corrosion / V.V. Gerasimov // Metallurgy: 1989. – 151 p. [in Russian]
  9. Perren R.A., Ugowitzer P.J., Speidel M.O. Microstructure and corrosion resistance of super duplex stainless steels. Duplex Stainless Steels 97/ Proseedings, 5th World Conference, 21-23 Jct. – Maastricht, Netherlands. – 1997. – 1. – P. 897.
  10. Manning P.E., Duquette D., Savage W.F. Technical note: The effect of retained ferrite on localized corrosion in duplex 304L stainless steel // Mater. Sci. – 1980. – 59. – P. 260–262.
  11. Wang J-H., Su C.C., Szklarska-Smialowska Z. Effects of Cl− Concentration and temperature on pitting of AISI 304 stainless steel // Corrosion. – – 44 (10). – P. 732–737. https://doi.org/10.5006/1.3584938