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<p>In this investigation, plasma electrochemical carbonitriding (PEC) was&#xa0;utilized to fabricate carbonitrided coatings on ZK60 magnesium alloy under varying process conditions. Specifically,&#xa0;two concentrations of triethanolamine, 200&#xa0;mL/L&#xa0;and 300&#xa0;mL/L, were investigated at reaction voltages spanning from 100 to 200&#xa0;V. The phase composition, surface morphology, and structural characteristics of the coatings were systematically analyzed using x-ray diffraction, Raman spectroscopy, scanning electron microscopy, coating thickness measurement, energy-dispersive x-ray spectroscopy, and potentiodynamic&#xa0;polarization curves. The results indicated that TEA concentration of 300&#xa0;mL/L combined with reaction voltage of 150&#xa0;V produced the most homogeneous and compact coating, exhibiting favorable phase composition and superior corrosion resistance.&#xa0;Based on these optimal PEC parameters, the subsequent micro-arc oxidation (MAO) treatment was performed to produce the composite ceramic coating. Comparative analyses (XRD, SEM, and Tafel plots) confirmed that the PEC/MAO composite coating significantly enhanced corrosion resistance compared with the single-layer PEC coating. This improvement is attributed to the incorporation of carbon and nitrogen species from the PEC layer into the MAO ceramic layer, which reduces defect density and suppresses electrochemical activity. Overall, the proposed PEC/MAO methodology provides a promising strategy for designing high-performance, corrosion-resistant coatings on lightweight magnesium alloys for structural applications.</p>

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Plasma Electrochemical Carbonitriding-Assisted Micro-arc Oxidation Coating for Corrosion Protection of ZK60 Magnesium Alloy

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Zhaozhong Qiu,
  • Ke Liu,
  • Zhaoyan Liu,
  • Xincheng Zhang,
  • Rui Ding,
  • Jia Sun,
  • Yao Zhang,
  • Jiawen Xu,
  • Ailian Liu,
  • Gang Liang,
  • Sun Limei

摘要

In this investigation, plasma electrochemical carbonitriding (PEC) was utilized to fabricate carbonitrided coatings on ZK60 magnesium alloy under varying process conditions. Specifically, two concentrations of triethanolamine, 200 mL/L and 300 mL/L, were investigated at reaction voltages spanning from 100 to 200 V. The phase composition, surface morphology, and structural characteristics of the coatings were systematically analyzed using x-ray diffraction, Raman spectroscopy, scanning electron microscopy, coating thickness measurement, energy-dispersive x-ray spectroscopy, and potentiodynamic polarization curves. The results indicated that TEA concentration of 300 mL/L combined with reaction voltage of 150 V produced the most homogeneous and compact coating, exhibiting favorable phase composition and superior corrosion resistance. Based on these optimal PEC parameters, the subsequent micro-arc oxidation (MAO) treatment was performed to produce the composite ceramic coating. Comparative analyses (XRD, SEM, and Tafel plots) confirmed that the PEC/MAO composite coating significantly enhanced corrosion resistance compared with the single-layer PEC coating. This improvement is attributed to the incorporation of carbon and nitrogen species from the PEC layer into the MAO ceramic layer, which reduces defect density and suppresses electrochemical activity. Overall, the proposed PEC/MAO methodology provides a promising strategy for designing high-performance, corrosion-resistant coatings on lightweight magnesium alloys for structural applications.