| 引用本文: | 徐鹏辉,王胜民,乐林江,赵晓军,高凯.Zn-Ni合金渗层的组织结构及腐蚀性能[J].中国表面工程,2022,35(1):135~143 |
| XU Penghui,WANG Shengmin,LE Linjiang,ZHAO Xiaojun,GAO Kai.Microstructure and Corrosion Properties of Zn-Ni Co-cementation Layer[J].China Surface Engineering,2022,35(1):135~143 |
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| 摘要: |
| 为改善传统渗锌层组织结构及腐蚀性能，采用甲酸镍和锌粉作为渗剂金属，通过机械能助渗法在 Q235 钢表面制备 Zn-Ni 合金渗层。结合扫描电镜(SEM)、EDS 能谱和 X 射线衍射仪(XRD)，分析 Zn-Ni 合金渗层的表面、截面和断口形貌； 利用极化曲线和电化学阻抗谱(EIS)，表征 Zn-Ni 合金渗层在 3.5%NaCl 溶液中的电化学行为；通过中性盐雾试验测试 Zn-Ni 合金渗层的耐腐蚀性能。结果表明：制备得到 Zn-Ni 合金渗层的厚度为 153 μm；渗层主要由 Γ(Fe11Zn40)相、ζ(FeZn15)相和 Ni2Zn11 金属间化合物组成，渗层结合方式属于冶金结合；Zn-Ni 渗层中性盐雾试验出现红锈的时间相比渗锌层延长 240 h， 自腐蚀电位从?1.222 V 正移至?0.957 V，渗层电阻提高 352 ?·cm2 ；Ni 对改善渗层表面组织状态和提高渗层耐腐蚀性具有显著价值。通过添加甲酸镍制备的 Zn-Ni 合金渗层相比渗锌层组织结构和腐蚀性能得到明显改善。 |
| 关键词: 冶金结合 Zn-Ni 共渗 甲酸镍 Ni2Zn11 耐腐蚀性能 |
| DOI：10.11933/j.issn.1007-9289.20211010001 |
| 分类号:TG174 |
| 基金项目: |
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| Microstructure and Corrosion Properties of Zn-Ni Co-cementation Layer |
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XU Penghui, WANG Shengmin, LE Linjiang, ZHAO Xiaojun, GAO Kai
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Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093 , China
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| Abstract: |
| In order to improve the structure and corrosion performance of the traditional sherardizing layer, nickel formate and zinc powder are used as the infiltrating agent metal, and the Zn-Ni cementation layer is prepared on the surface of Q235 steel by the mechanical energy assisted technology. The surface, cross-section and fracture morphology of the Zn-Ni cementation layer are characterized by scanning electron microscope (SEM), EDS spectroscopy and X-ray diffractometer (XRD); Electrochemical behavior of Zn-Ni cementation layer immersed in 3.5%NaCl solution is analyzed by polarization curve and electrochemical impedance spectroscopy(EIS). Corrosion resistance of Zn-Ni cementation layer is tested by neutral salt spray test. The results show that the thickness of the Zn-Ni cementation layer is 153 μm; the layer is mainly composed of Γ (Fe11Zn40) phase, ζ (FeZn15) phase and Ni2Zn11 intermetallic compound, cementation layer combination method belongs to metallurgical bonding. The neutral salt spray experiment of Zn-Ni cementation layer is longer 240 h than Zn cementation layer when appearing red rust spots, the self-corrosion potential move from ?1.222 V to ?0.957 V, impedance modulus of layer resistance is increased by 352 ?·cm2 ; Ni has significant value in improving the surface structure and the corrosion resistance of the infiltration layer. Comprehensively show that the Zn-Ni cementation layer prepared by adding nickel formate has significantly improved structure and performance compared to the sherardizing layer. |
| Key words: metallurgical bonding Zn-Ni co-cementation nickel formate Ni2Zn11 corrosion resistance |
