TiN颗粒对镁合金微弧氧化过程及膜层性能的影响

发布时间：2018-11-02 12:44

【摘要】：目的分析Ti N颗粒在镁合金微弧氧化过程中的作用,并研究其在膜层中对镁合金硬度、耐磨和耐蚀等性能的影响。方法通过在微弧氧化电解液中添加2.7μm Ti N颗粒,并使其充分分散于电解液中,使电解液中Ti N颗粒的质量浓度分别为0、2、4、6 g/L,并控制其他实验参数(如电流密度、频率、占空比和氧化时间)一样的情况下进行实验,通过电子显微镜、涂层厚度测厚仪、显微维氏硬度计、X射线衍射和电化学工作站,分别从膜层的表面形貌、厚度、硬度、相组成及耐蚀性等方面,研究了Ti N颗粒对镁合金微弧氧化膜层性能的影响。结果在微弧氧化电解液中添加Ti N颗粒后,相同电化学参数下制得的微弧氧化膜层变得致密,厚度、硬度有所增加,氧化膜层主要由Mg、MgO、Mg2Zr5O12、Ti N组成。极化曲线显示,加入Ti N颗粒,制备的微弧氧化膜层比未加入Ti N颗粒制得的膜层的腐蚀电流下降了2个数量级。阻抗图谱表明,电阻值增加了1个数量级。结论 Ti N颗粒能够随镁合金的微弧氧化过程进入制得的氧化膜层中,并且能够增加膜层厚度和硬度,使膜层的耐磨、耐蚀性得到提高。
[Abstract]:Objective to study the effect of Ti N particles on the hardness, wear resistance and corrosion resistance of magnesium alloys during micro-arc oxidation. Methods by adding 2. 7 渭 m Ti N particles into the electrolyte and dispersing them in the electrolyte, the mass concentration of Ti N particles in the electrolyte was 0 ~ 2 ~ 2 ~ 4 ~ 4 g / L, respectively, and other experimental parameters (such as current density) were controlled. The experiments were carried out at the same frequency, duty cycle and oxidation time. By means of electron microscope, coating thickness gauge, Vickers hardness meter, X-ray diffraction and electrochemical workstation, the surface morphology, thickness, hardness of the film, The effect of Ti N particles on the properties of magnesium alloy micro-arc oxide film was studied in terms of phase composition and corrosion resistance. Results after the addition of Ti N particles into the electrolyte of microarc oxidation, the microarc oxide film prepared under the same electrochemical parameters became compact, thick and hardness increased, and the oxide film was mainly composed of Mg,MgO,Mg2Zr5O12,Ti N. The polarization curves show that the corrosion current of the coating prepared by adding Ti N particles is decreased by 2 orders of magnitude compared with that of the film prepared without Ti N particles. The impedance diagram shows that the resistance increases by an order of magnitude. Conclusion Ti N particles can enter the oxide film with the process of micro-arc oxidation of magnesium alloy, increase the thickness and hardness of the film, and improve the wear resistance and corrosion resistance of the film.
【作者单位】：华北水利水电大学;渤海大学;
【基金】：河南省创新型科技团队(C20150017) 河南省工程技术研究中心(豫科2016-221号-高新35) 郑州市重点实验室(郑科技[2014]3号-10)~~
【分类号】：TG174.4

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