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<p>This study investigates the influence of composition and processing technology on the microstructure, hardness, and corrosion resistance of 18&#xa0;K gold alloys (red, white, and yellow), fabricated into identical shapes using industry-standard methods. X-ray diffraction (XRD), differential scanning calorimetry (DSC), microhardness testing, electrochemical analysis, scanning electron microscopy (SEM), and atomic force microscopy (AFM) were employed to characterize the samples. Results demonstrate that processing technology has a more pronounced effect on hardness and corrosion resistance than alloy composition. Cold mechanical processing markedly increases hardness, with red, white, and yellow gold reaching 214.7 HV<sub>0.5</sub>, 238.2 HV<sub>0.5</sub>, and 234.9 HV<sub>0.5</sub>, respectively. However, this process induces residual stresses that adversely affect corrosion resistance, as reflected in the corrosion potentials: <i>R</i> (0.002 V<sub>SCE</sub>) and <i>W</i> (− 0.004 V<sub>SCE</sub>) alloys exhibited more noble corrosion potentials than <i>Y</i> (− 0.061 V<sub>SCE</sub>) alloy. Compositional variations primarily influence the microstructure and corrosion morphologies of the alloys, with all samples exhibiting a single-phase solid solution structure but distinct surface corrosion morphologies. To optimize performance, this work proposes a post-processing low-temperature annealing treatment (~400&#xa0;oC) for high cold-worked 18&#xa0;K gold alloys. This approach effectively eliminates residual stress, enhances corrosion resistance, while maintaining high hardness, offering a practical strategy for improving the functional durability of 18&#xa0;K gold jewelry and components.</p>

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Research on the Structure, Hardness, and Corrosion Resistance of Colored 18 K Gold

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Guihua Li,
  • Shu Chen,
  • Yingjie Li,
  • Xuesong Liu,
  • Fuming Li,
  • Ping Wang,
  • Guanzheng Zang,
  • Jianjun Li,
  • Xiuyun Ding,
  • Kechang Shen

摘要

This study investigates the influence of composition and processing technology on the microstructure, hardness, and corrosion resistance of 18 K gold alloys (red, white, and yellow), fabricated into identical shapes using industry-standard methods. X-ray diffraction (XRD), differential scanning calorimetry (DSC), microhardness testing, electrochemical analysis, scanning electron microscopy (SEM), and atomic force microscopy (AFM) were employed to characterize the samples. Results demonstrate that processing technology has a more pronounced effect on hardness and corrosion resistance than alloy composition. Cold mechanical processing markedly increases hardness, with red, white, and yellow gold reaching 214.7 HV0.5, 238.2 HV0.5, and 234.9 HV0.5, respectively. However, this process induces residual stresses that adversely affect corrosion resistance, as reflected in the corrosion potentials: R (0.002 VSCE) and W (− 0.004 VSCE) alloys exhibited more noble corrosion potentials than Y (− 0.061 VSCE) alloy. Compositional variations primarily influence the microstructure and corrosion morphologies of the alloys, with all samples exhibiting a single-phase solid solution structure but distinct surface corrosion morphologies. To optimize performance, this work proposes a post-processing low-temperature annealing treatment (~400 oC) for high cold-worked 18 K gold alloys. This approach effectively eliminates residual stress, enhances corrosion resistance, while maintaining high hardness, offering a practical strategy for improving the functional durability of 18 K gold jewelry and components.