| 摘要: |
| 通过改变镀液中H3PO3的添加量（15~40 g/L）制备不同P含量的Fe-Co-Ni-P镀层，采用XRD衍射仪、交流阻抗谱和超声波气蚀试验，分别研究和分析了P含量对镀层的结构以及腐蚀、气蚀性能的影响。结果表明：该四元合金镀层基本都为非晶态。随着合金镀层中P含量增加，镀层表面的胞状组织越来越细密，其耐腐蚀性能逐渐增强。当镀液中H3PO3添加量为40 g/L时，镀层的耐腐蚀性能最好。当镀液中H3PO3为15 g/L时，交流阻抗谱表现出Warburg阻抗的特征，溶液状态由电荷迁移、扩散以及化学反应混合。当镀液中H3PO3为20~40 g/L时，镀层的交流阻抗谱都只有一个容抗弧，表现出一个时间常数特征，且电极过程存在扩散受阻的现象。当镀液中H3PO3为40 g/L时，拟合的等效电路中的镀层电荷转移电阻Rf达到最大值3 494 Ω·cm2。且当镀液中H3PO3的添加量为40 g/L时，其镀层抗气蚀性能也最好。 |
| 关键词: 电沉积 电镀 极化曲线 交流阻抗谱 气蚀 |
| DOI：10.11933/j.issn.1007-9289.20161011001 |
| 分类号: |
| 基金项目:国家自然科学基金（51475140） |
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| Preparation and Properties of Electrodeposited Amorphous Fe-Co-Ni-P Coatings |
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LUO Chan-yuan1,2, JI Xiu-lin1,2, LI Ze1,2
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1.College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, Jiangsu;2.Engineering Research Center of Dredging Technology of Ministry of Education, Hohai University, Changzhou 213022, Jiangsu
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| Abstract: |
| Fe-Co-Ni-P alloy coatings with different P content were prepared by adjusting the amount of H3PO3(15~40 g/L) in the bath. The influence of P content on the structure and properties of the electrodeposited Fe-Co-Ni-P alloy coating was analyzed by XRD, AC impedance spectra and ultrasonic cavitation test. The results show that these alloyed coatings are amorphous. Higher P content is benificial to refine the cellular structure of coatings, which helps to improve the corrosion resistance of the coating. When the H3PO3 content in the bath is to 40 g/L, the coating has the best corrosion resistance. When the H3PO3 content in the bath is to 15 g/L, the AC impedance spectra show the characteristic of Warburg impedance. However, when the H3PO3 content in the bath is 20-40 g/L, it only have a capacitive arc, which indicates ablocked diffusion in the electrode process. When the H3PO3 content in the bath is to 40 g/L, the charge transfer resistance Rf of the equivalent circuit coating reaches the maximum value 3 494 Ω·cm2 in all the coatings. Moreover, the coating fabricated from 40 g/L H3PO3 has the best cavitation resistance performance. |
| Key words: electrodeposition electroplate polarization curve AC impedance spectroscopy cavitation |
