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<p>In this study, TiAlN coatings were deposited on 420 stainless steel substrates using the cathodic arc evaporation (CAE) method at various bias voltages (− 50, − 100, and − 150&#xa0;V). The impact of the bias voltage on the microstructure, mechanical properties, and electrochemical corrosion behavior of the coatings was investigated in this research. The coatings were characterized by x-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and nanoindentation. Their corrosion performance was evaluated in a 3.5&#xa0;wt.% NaCl solution via potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results show that increasing the bias voltage refines the grain structure, reduces macroparticle (MPs) defects, and enhances the hardness to 11.2&#xa0;GPa for the − 150&#xa0;V bias voltage. However, the best corrosion resistance was achieved at a bias voltage of − 100&#xa0;V, which yielded the lowest corrosion current density (4.1&#xa0;µA/cm<sup>2</sup>) and the highest polarization resistance. The results suggest a critical condition for balancing the promotion of a dense, defect-minimized microstructure against the detrimental consequences associated with excessively high ion bombardment.</p>

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Mechanical and Electrochemical Corrosion Properties of TiAlN Coatings Deposited at Different Bias Voltages by Cathodic Arc Evaporation

  • 期刊论文

  • 发表日期：

    2026年4月11日

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  • Majid Mohammadi,
  • Sahebali Manafi,
  • Mina Toloueipour

摘要

In this study, TiAlN coatings were deposited on 420 stainless steel substrates using the cathodic arc evaporation (CAE) method at various bias voltages (− 50, − 100, and − 150 V). The impact of the bias voltage on the microstructure, mechanical properties, and electrochemical corrosion behavior of the coatings was investigated in this research. The coatings were characterized by x-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and nanoindentation. Their corrosion performance was evaluated in a 3.5 wt.% NaCl solution via potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results show that increasing the bias voltage refines the grain structure, reduces macroparticle (MPs) defects, and enhances the hardness to 11.2 GPa for the − 150 V bias voltage. However, the best corrosion resistance was achieved at a bias voltage of − 100 V, which yielded the lowest corrosion current density (4.1 µA/cm2) and the highest polarization resistance. The results suggest a critical condition for balancing the promotion of a dense, defect-minimized microstructure against the detrimental consequences associated with excessively high ion bombardment.