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<p>The article presents the results of studying the structure, corrosion resistance, and heat resistance of coatings obtained by depositing Nb-Hf-Ta and Nb-Hf-Ta-Cr powder mixtures onto structural steel. The deposition was performed using a&#xa0;relativistic electron beam in air. The coating thickness was ~ 2.4 mm. It is shown that during electron beam heating, a&#xa0;dendritic structure is formed in the surface layers, consisting of a&#xa0;ferrite matrix (α-Fe) and intermetallic compounds (TaFe<sub>2</sub> and Cr<sub>2</sub>Hf). The microhardness of the hardened layers was as high as 800–850 <i>HV</i>. Depositing protective coatings leads to an increased corrosion resistance of the developed materials in 10% nitric acid solution. Depositing Nb-Ta-Hf increases the passivation region compared to stainless steel 12Kh18N9T (0.12C-18Cr-9Ni-Ti). However, such formed layer does not provide satisfactory corrosion protection in aggressive environment. The addition of chromium to the surfacing mixture enhances passivation due to its ability to form dense oxide layers. The heat resistance of the hardened layers was assessed. It was established that the heat resistance of the formed surface layers at 850 °C is 3&#xa0;times higher compared to corrosion-resistant steel 12Kh18N9T.</p>

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Corrosion resistance of materials obtained by non-vacuum electron beam surfacing with niobium-hafnium-tantalum powder mixtures

  • 期刊论文

  • 发表日期：

    2026年1月15日

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  • E. A. Drobyaz,
  • V. A. Bataev,
  • P. M. Petukhova,
  • O. N. Novgorodtseva

摘要

The article presents the results of studying the structure, corrosion resistance, and heat resistance of coatings obtained by depositing Nb-Hf-Ta and Nb-Hf-Ta-Cr powder mixtures onto structural steel. The deposition was performed using a relativistic electron beam in air. The coating thickness was ~ 2.4 mm. It is shown that during electron beam heating, a dendritic structure is formed in the surface layers, consisting of a ferrite matrix (α-Fe) and intermetallic compounds (TaFe2 and Cr2Hf). The microhardness of the hardened layers was as high as 800–850 HV. Depositing protective coatings leads to an increased corrosion resistance of the developed materials in 10% nitric acid solution. Depositing Nb-Ta-Hf increases the passivation region compared to stainless steel 12Kh18N9T (0.12C-18Cr-9Ni-Ti). However, such formed layer does not provide satisfactory corrosion protection in aggressive environment. The addition of chromium to the surfacing mixture enhances passivation due to its ability to form dense oxide layers. The heat resistance of the hardened layers was assessed. It was established that the heat resistance of the formed surface layers at 850 °C is 3 times higher compared to corrosion-resistant steel 12Kh18N9T.