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Abstract <p>Nickel-titanium-palladium shape memory alloys show broad application prospects due to their shape memory effect and superelasticity in high-temperature environments. Nickel serves as the pivotal constituent in the material system, with its concentration and spatial distribution critically governing the phase transition temperature, mechanical performance, and high-temperature stability, thereby dictating the alloy’s functional behavior. A gravimetric method was developed for nickel determination in Ti–Ni–Pd shape memory alloys. Key analytical parameters, including dissolution conditions, interference effects from matrix elements, dimethylglyoxime concentration (optimized at 30 mL of 10 g/L solution), and precipitation incubation (90 min at a controlled 70°C), were systematically investigated. Method validation demonstrated excellent precision (RSD &lt; 0.5%, <i>n</i> = 7) and accuracy (99.4–100.4% recovery rates) through spike recovery experiments. A key advancement lies in elucidating the competitive coordination mechanism between palladium and nickel complexes with dimethylglyoxime, which enabled the development of a masking protocol to mitigate Pd interference. These optimizations significantly improved methodological robustness, achieving above 99% recovery rates for nickel in complex matrices while maintaining operability under routine laboratory conditions.</p>

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Chemical Analysis Method for Detecting Nickel in Ni–Ti–Pd Shape Memory Alloys

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Na Li,
  • Shengchen Li,
  • Xia Zhao,
  • Wenzhi Qiang,
  • Limin Zhang,
  • Shuming Wang,
  • Yifan Tian,
  • Ling Zhang,
  • Yingchun Chen,
  • Ruotong Liu

摘要

Abstract

Nickel-titanium-palladium shape memory alloys show broad application prospects due to their shape memory effect and superelasticity in high-temperature environments. Nickel serves as the pivotal constituent in the material system, with its concentration and spatial distribution critically governing the phase transition temperature, mechanical performance, and high-temperature stability, thereby dictating the alloy’s functional behavior. A gravimetric method was developed for nickel determination in Ti–Ni–Pd shape memory alloys. Key analytical parameters, including dissolution conditions, interference effects from matrix elements, dimethylglyoxime concentration (optimized at 30 mL of 10 g/L solution), and precipitation incubation (90 min at a controlled 70°C), were systematically investigated. Method validation demonstrated excellent precision (RSD < 0.5%, n = 7) and accuracy (99.4–100.4% recovery rates) through spike recovery experiments. A key advancement lies in elucidating the competitive coordination mechanism between palladium and nickel complexes with dimethylglyoxime, which enabled the development of a masking protocol to mitigate Pd interference. These optimizations significantly improved methodological robustness, achieving above 99% recovery rates for nickel in complex matrices while maintaining operability under routine laboratory conditions.