Microstructure, Mechanical Properties, and Corrosion Behavior of NiCrMoTi Coatings with Boron Addition Fabricated by Non-vacuum Electron Beam Cladding

Microstructure, Mechanical Properties, and Corrosion Behavior of NiCrMoTi Coatings with Boron Addition Fabricated by Non-vacuum Electron Beam Cladding Научная публикация

Журнал

Metals and Materials International
ISSN: 1598-9623

Вых. Данные

Год: 2026, DOI: 10.1007/s12540-025-02136-x

Ключевые слова

Non-vacuum electron beam cladding · NiCrMoTi-B coating (boron-modified) · Microstructure · Corrosion behavior

Авторы

Malyutina Yuliya N. ^1,2 , Ruktuev Alexey A. ¹ , Emurlaev Kemal I. ^1,3 , Petukhova Polina M. ¹ , Panafidin Maxim A. ³ , Bataev Vladimir A. ¹ , Losinskaya Anna A. ¹

Организации

1	Faculty of Mechanical Engineering and Technologies, Novosibirsk State Technical University, K. Marx Ave. 20, Novosibirsk, Russia, 630073
2	Lavrentiev Institute of Hydrodynamics, Lavrentyev Ave. 15, Novosibirsk, Russia, 630090
3	Synchrotron Radiation Facility - Siberian Circular Photon Source «SKIF», Boreskov Institute of Catalysis SB RAS, Nikolsky ave. 1, Kol’tsovo, Russia, 630559

This study presents a novel approach to enhance the corrosion resistance of 40Cr steel by applying boron-modified NiCrMoTi coatings fabricated by non-vacuum electron beam cladding. Single-layer (S1) and double-layer (S2, S3) coatings were produced, with the S3 coating containing boron and chromium in the second layer. Microstructural analysis revealed a γ-(Fe, Ni) solid solution matrix in all coatings, while the S3 coating additionally exhibited hard (Fe, Cr)2B boride phases. The hardness values of analyzed samples were as follows: 238 ± 10 HV for 40Cr steel substrate, 285 ± 15 HV for S1 coating, 355 ± 25 HV and 275 ± 15 HV for the first and second layers of S2 coating, respectively. The introduction of boron and chromium resulted in significant grain refinement and increased microhardness. The maximum hardness value of the S3 coating reached 1637 HV, while an average microhardness in the second layer was 1010 ± 260 HV. Electrochemical tests in 10% HNO3 solution showed that all coatings significantly improved the corrosion resistance compared to the uncoated 40Cr steel. The single-layer S1 (Icorr = 0.046 mA/cm2, Ecorr = + 0.224 V) and the double-layer S3 (Icorr = 2.526 mA/cm2, Ecorr = − 0.124 V) coatings showed intermediate corrosion properties, while the double-layer S2 coating demonstrated optimal corrosion performance with the lowest corrosion current density (Icorr = 0.003 mA/cm2) and the highest corrosion potential (Ecorr = + 0.468 V). The superior corrosion resistance of the S2 coating is attributed to its elevated Ni (45 wt%) and Cr (15.8 wt%) content, which stabilized the passive film. In contrast, the heterogeneous microstructure of S3 coating caused selective matrix dissolution, despite the strengthening effect of boride phase. The results highlight that corrosion mechanisms are strongly influenced by microstructural features, with selective dissolution occurring along phase boundaries in heterogeneous coatings.

Malyutina Y.N. , Ruktuev A.A. , Emurlaev K.I. , Petukhova P.M. , Panafidin M.A. , Bataev V.A. , Losinskaya A.A.
Microstructure, Mechanical Properties, and Corrosion Behavior of NiCrMoTi Coatings with Boron Addition Fabricated by Non-vacuum Electron Beam Cladding
Metals and Materials International. 2026. DOI: 10.1007/s12540-025-02136-x Scopus OpenAlex

Опубликована online:

5 дек. 2025 г.

Scopus:	2-s2.0-105023997337
OpenAlex:	W4417016392

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