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<p>The targets resembling gold were produced by melting Cu-Zn-Al alloy with various Ce (0.1-0.5 wt.%) and La (0.1-0.5 wt.%) in this paper. The influence of rare earth elements on structure, corrosion resistance and color of the targets was systematically examined. The results of the study indicated that adding the Ce element at the range of 0.3-0.4 wt.% or La element at the range of 0.2-0.3 wt.% moderately improved grain refinement and encouraged the shift from columnar-to-equiaxial crystals. Although excess additions of the element of Ce or La can cause elemental segregation, the charge transfer resistance (Rct) reached 7216 Ω·cm<sup>2</sup> in Cu-Zn-Al-Ce alloy group at the condition of 0.4wt.% Ce and 2882 Ω·cm<sup>2</sup> in Cu-Zn-Al-La alloy group at the condition of 0.2wt.% La in the electrochemical impedance measurement, respectively. Chromaticity analysis indicated that the addition of rare earth elements had a limited effect on the difference ΔE of the imitation gold targets with a fluctuation value less than 1.5. It was found that the color of the imitation gold target material still had a certain matching degree with the standard gold, and the optimal ΔE value can reach 4.87 in the CIELAB color space.</p>

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Study on the Influence Mechanism of Rare Earth Elements Ce and La on the Corrosion Resistance of Cu-Zn-Al Imitation Gold Alloy Targets

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • Yilin Shao,
  • Fengqi Zhang,
  • Xin Liang,
  • Zhuang Hao,
  • Ruiting Ma,
  • Pengyan Mao,
  • Shaohu Tao

摘要

The targets resembling gold were produced by melting Cu-Zn-Al alloy with various Ce (0.1-0.5 wt.%) and La (0.1-0.5 wt.%) in this paper. The influence of rare earth elements on structure, corrosion resistance and color of the targets was systematically examined. The results of the study indicated that adding the Ce element at the range of 0.3-0.4 wt.% or La element at the range of 0.2-0.3 wt.% moderately improved grain refinement and encouraged the shift from columnar-to-equiaxial crystals. Although excess additions of the element of Ce or La can cause elemental segregation, the charge transfer resistance (Rct) reached 7216 Ω·cm2 in Cu-Zn-Al-Ce alloy group at the condition of 0.4wt.% Ce and 2882 Ω·cm2 in Cu-Zn-Al-La alloy group at the condition of 0.2wt.% La in the electrochemical impedance measurement, respectively. Chromaticity analysis indicated that the addition of rare earth elements had a limited effect on the difference ΔE of the imitation gold targets with a fluctuation value less than 1.5. It was found that the color of the imitation gold target material still had a certain matching degree with the standard gold, and the optimal ΔE value can reach 4.87 in the CIELAB color space.