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<p>Electrodeposition was employed to produce cobalt and Co/ZrB<sub>2</sub> coatings on steel substrates. The coatings' morphological and structural features, and corrosion performance were assessed. The results showed that the pure cobalt and all composite electrodeposits had a nano-crystalline hexagonal close-packed (hcp) structure. However, the addition of ZrB<sub>2</sub> particles changed the preferred orientation, leading to a transformation from the relatively smooth pyramidal morphology of cobalt to a rougher surface at higher ZrB<sub>2</sub> particle concentrations (<i>i.e.</i>, 20 and 25&#xa0;g L<sup>−1</sup>). Based on the polarization and EIS outcomes, all coatings displayed significantly enhanced corrosion performance than the uncoated steel substrate. The addition of low (1 and 2&#xa0;g L<sup>−1</sup>) or high (25&#xa0;g L<sup>−1</sup>) ZrB<sub>2</sub> particle concentrations to the bath had minimal impact on the corrosion performance of the cobalt electrodeposits. However, the presence of ZrB<sub>2</sub> particles within the range of 5 to 20&#xa0;g L<sup>−1</sup> resulted in improved corrosion resistance for cobalt. Notably, the Co/15 ZrB<sub>2</sub> coating, having a charge transfer resistance of 41474 Ω cm<sup>2</sup>, exhibited the best corrosion resistance, representing a threefold reduction from the pure cobalt electrodeposit. The Co/20 ZrB<sub>2</sub> coating exhibited the highest hardness, measuring 573 HV, making it the hardest coating among the studied samples.</p>

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Enhanced Corrosion Resistance of Cobalt Coatings: The Role of ZrB2 Particle Incorporation

  • 期刊论文

  • 发表日期：

    2025年3月13日

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  • Soheil Mahdavi,
  • Asiyeh Fakhri

摘要

Electrodeposition was employed to produce cobalt and Co/ZrB2 coatings on steel substrates. The coatings' morphological and structural features, and corrosion performance were assessed. The results showed that the pure cobalt and all composite electrodeposits had a nano-crystalline hexagonal close-packed (hcp) structure. However, the addition of ZrB2 particles changed the preferred orientation, leading to a transformation from the relatively smooth pyramidal morphology of cobalt to a rougher surface at higher ZrB2 particle concentrations (i.e., 20 and 25 g L−1). Based on the polarization and EIS outcomes, all coatings displayed significantly enhanced corrosion performance than the uncoated steel substrate. The addition of low (1 and 2 g L−1) or high (25 g L−1) ZrB2 particle concentrations to the bath had minimal impact on the corrosion performance of the cobalt electrodeposits. However, the presence of ZrB2 particles within the range of 5 to 20 g L−1 resulted in improved corrosion resistance for cobalt. Notably, the Co/15 ZrB2 coating, having a charge transfer resistance of 41474 Ω cm2, exhibited the best corrosion resistance, representing a threefold reduction from the pure cobalt electrodeposit. The Co/20 ZrB2 coating exhibited the highest hardness, measuring 573 HV, making it the hardest coating among the studied samples.