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| 基于增量磁导率的电镀镍层拉应力定量检测方法 |
| Quantitative Detection Method of Tensile Stress in Electroplated Nickel Coatings Based on Magnetic Incremental Permeability |
| 投稿时间：2023-10-17 修订日期：2024-01-17 |
| DOI： |
| 中文关键词: 增量磁导率 电镀镍层 拉应力 定量检测 |
| 英文关键词:Magnetic incremental permeability Electroplated nickel coatings Tensile stress Quantitative detection |
| 基金项目:国家自然科学基金资助项目（12122201，62271015）；北京市自然科学基金资助项目（4232001） |
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| 中文摘要: |
| 电镀工艺中镀层的应力状态是影响电镀产品性能的重要因素。本文针对微米级厚度镍镀层的应力检测问题，采用增量磁导率检测技术对金属构件表面微米级厚度镍镀层的拉应力进行无损检测与评估。首先，发展了可同步测量电镀镍层表面拉力、应变和增量磁导率信号的试验装置，并开展增量磁导率检测实验；其次，定性分析了拉应力对增量磁导率蝴蝶曲线的影响规律，并从实验信号中优选出两种对镍镀层拉应力敏感的特征磁参量。最后，基于二次函数定量分析了特征磁参量对电镀镍层试样表面拉应力的表征能力。结果表明：选取的两种增量磁导率特征磁参量（B2或Hmax）与拉应力呈抛物线依赖关系（R2>0.95），利用建立的方程可以实现最薄2.809μm厚度的镍镀层上拉应力的定量检测。 |
| 英文摘要: |
| The stress states of ferromagnetic coatings in the electroplating process have great influence on the performance of electroplated products. In this paper, aiming at the stress detection of electroplated nickel coatings with micron-level thickness, a magnetic incremental permeability technology has been proposed to perform non-destructive testing and evaluation of the tensile stress of different nickel coatings thickness ranging from 2.809μm to 35.654μm on the surface of metal components. Firstly, an experimental device was developed to synchronously measure the uniaxial tension, strain, and magnetic incremental permeability signals of electroplated nickel coating, and conduct the magnetic incremental permeability detection experiments. Secondly, the influence of tensile stress on the incremental permeability butterfly curve was qualitatively analyzed, two characteristic magnetic parameters sensitive to tensile stress in nickel coating were selected from the experimental signals. Finally, the characterization ability of magnetic parameters on the tensile stress of electroplated nickel specimens was quantitatively analyzed based on the quadratic function. Experimental results indicated that the two selected characteristic magnetic parameters (B2 or Hmax) based on the magnetic incremental permeability exhibited a parabolic dependency relationship with tensile stress (R2>0.95), the established equation was used to quantitatively predict the tensile stress of nickel coatings, and the results showed that magnetic incremental permeability technology can achieve the quantitative detection of elastic tensile stress on ferromagnetic nickel coatings with the thinnest thickness of 2.809μm. |
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