朱鼎,章晓波.GZ91K镁合金含石墨微弧氧化膜层的耐蚀性能[J].表面技术,2020,49(7):53-59.
ZHU Ding,ZHANG Xiao-bo.Corrosion Resistance of Graphite-containing Micro-arc Oxidation Coating on GZ91K Magnesium Alloy[J].Surface Technology,2020,49(7):53-59 |
| GZ91K镁合金含石墨微弧氧化膜层的耐蚀性能 |
| Corrosion Resistance of Graphite-containing Micro-arc Oxidation Coating on GZ91K Magnesium Alloy |
| 投稿时间：2020-06-15 修订日期：2020-07-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.07.007 |
| 中文关键词: 镁合金 石墨 微弧氧化 耐蚀性能 表面处理 |
| 英文关键词:magnesium alloy, graphite, micro-arc oxidation, corrosion resistance, surface treatment |
| 基金项目:江苏省高等学校自然科学研究重大项目（18KJA430008），江苏省“333工程”项目（BRA2018338） |
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| Author | Institution |
| ZHU Ding | 1.School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, China;2.Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, China |
| ZHANG Xiao-bo | 1.School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, China;2.Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, China |
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| 中文摘要: |
| 目的 通过在电解液中添加石墨，提高Mg-9Gd-1Zn-0.4Zr（GZ91K）镁合金微弧氧化膜层的耐蚀性能。方法 通过微弧氧化法，在GZ91K镁合金表面制备含和不含石墨的微弧氧化膜层。利用扫描电镜（SEM）和能谱仪（EDS）、X射线衍射仪（XRD）、电化学工作站、浸泡实验等手段，研究膜层的形貌、成分、物相和耐蚀性能。结果 含石墨膜层较不含石墨膜层更加致密，孔洞更加细小。含石墨膜层主要由Mg、O、C、Si、P、Gd等成分组成，相比不含石墨膜层，除了C以外，成分变化不大。含和不含石墨膜层的物相均主要由MgO和Mg2SiO4等组成。随着电解液中石墨浓度的增加，膜层的耐蚀性能相应提高。添加5 g/L石墨制备的试样具有最佳的耐蚀性能，腐蚀电流密度仅为9.8×10–9 A/cm2，相比未添加石墨试样的耐蚀性能提高了500倍。模拟体液浸泡实验显示，含石墨量越高的试样具有越低的析氢量，添加5 g/L石墨制备的试样析氢量最低。结论 在0~5 g/L添加量范围内，石墨浓度越高，石墨颗粒越容易堵塞和切断膜层中的部分孔洞，并阻碍腐蚀性液体与基体接触，从而显著提高镁合金的耐蚀性能。 |
| 英文摘要: |
| The corrosion resistance of the Mg-9Gd-1Zn-0.4Zr (GZ91K) magnesium alloy micro-arc oxidation (MAO) coatings was improved by adding graphite into the electrolyte. In this work, the MAO coating with and without graphite was prepared on the surface of GZ91K magnesium alloy. The morphology, composition, phase and corrosion resistance of the coatings were studied by means of SEM, EDS, XRD, electrochemical workstation and immersion test. It is found that the coating with graphite is denser and the pore diameter becomes smaller than that without graphite. The coating with graphite is mainly composed of Mg, O, C, Si, P, Gd. Compared with the coating without graphite, the composition of the coating has little change except for C. The phases of the coatings with and without graphite are mainly composed of MgO and Mg2SiO4. With the increase of the graphite concentration in the electrolyte, the corrosion resistance of the coating is improved apparently. The corrosion current density of the sample prepared by adding 5 g/L graphite is only 9.8×10–9 A/cm2, indicating that the corrosion resistance of this sample is 500 times higher than that of the sample without graphite. The simulated body fluid immersion experiment also showed that the higher the graphite content, the lower the hydrogen evolution, and the lowest hydrogen evolution was obtained by adding 5 g/L graphite. In the range of 0~5 g/L, with increasing graphite concentration, the graphite particles could easily block and cut off some holes in the film and prevent the corrosive liquid from contacting with the matrix, and thus it significantly improves the corrosion resistance of the magnesium alloy. |
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