朱青,朱明,余勇,张路路.AZ91D 镁合金 Mo-Mn 无铬转化膜的制备与耐蚀性[J].表面技术,2015,44(8):9-14.
ZHU Qing,ZHU Ming,YU Yong,ZHANG Lu-lu.Preparation and Corrosion Resistance of Mo-Mn Chromium-free Conversion Coating Formed on AZ91D Magnesium Alloys[J].Surface Technology,2015,44(8):9-14 |
| AZ91D 镁合金 Mo-Mn 无铬转化膜的制备与耐蚀性 |
| Preparation and Corrosion Resistance of Mo-Mn Chromium-free Conversion Coating Formed on AZ91D Magnesium Alloys |
| 投稿时间：2015-04-10 修订日期：2015-08-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2015.08.002 |
| 中文关键词: AZ91D 镁合金 Mo-Mn 转化膜 耐蚀性 钼酸盐 高锰酸盐 |
| 英文关键词:magnesium alloy Mo-Mn conversion coating corrosion resistance molybdate permangate |
| 基金项目:国家自然科学基金(51201131);陕西省青年科技新星项目(2013KJXX-42) |
| 作者 | 单位 |
| 朱青 | 西安科技大学 材料与科学工程学院, 西安 710054 |
| 朱明 | 西安科技大学 材料与科学工程学院, 西安 710054 |
| 余勇 | 西安科技大学 材料与科学工程学院, 西安 710054 |
| 张路路 | 西安科技大学 材料与科学工程学院, 西安 710054 |
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| Author | Institution |
| ZHU Qing | College of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China |
| ZHU Ming | College of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China |
| YU Yong | College of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China |
| ZHANG Lu-lu | College of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China |
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| 中文摘要: |
| 目的 通过 Mo-Mn 无铬转化膜提高 AZ91D 镁合金的表面耐蚀性。 方法 采用正交实验法,研究不同浓度的 NaMoO4 和 KMnO4 以及温度对转化膜的影响。 优选实验参数后,考察时间对转化膜的影响。 利用 SEM 及 EDS 研究转化膜的微观形貌及成分变化,测试转化膜在 3. 5% NaCl 溶液中的极化曲线和交流阻抗谱。 结果 当 NaMoO4 和 KMnO4 的质量浓度分别为 10,6 g/ L,pH = 5,温度为 50 ℃ ,转化时间为 40 min 时,转化膜颜色较为均匀,微观裂纹相对较少,自腐蚀电位比镁基体大约提高 0. 075 V,自腐蚀电流密度比镁基体降低近 1 个数量级。 当 NaMoO4 和 KMnO4 的质量浓度分别为 20,8 g/ L,pH = 5,温度为 50 ℃ ,转化时间为 40 min 时,转化膜颜色最为均匀,微观裂纹相对最少,自腐蚀电位比镁基体提高大约 0. 047 V,自腐蚀电流密度比镁基体降低 2 个数量级。 交流阻抗谱图显示,后一种转化膜试样的极化电阻为 1450. 2 Ω,而镁基体的极化电阻为 806. 4 Ω。 结论 Mo-Mn 无铬转化膜可以显著提高 AZ91D 镁合金的表面耐蚀性。 |
| 英文摘要: |
| Objective To improve the surface corrosion resistance of AZ91D magnesium alloy by Mo-Mn chromium-free conver- sion coating. Methods Effects of different concentrations of NaMoO4 and KMnO4 and temperature on the transformed sample film were studied by orthogonal experimental method. After optimizing experiment parameters, the effects of the time on the conversion film was also studied. The morphology and component of conversion coatings were researched by SEM and EDS. Moreover, the po- larization curves and electrochemical impedance spectroscopy of conversion coating were tested in 3. 5% NaCl aqueous solution. Results The results showed that when the condition was 10 g / L NaMoO4 , 6 g / L KMnO4 at 50 ℃ and pH 5 for 40 min, where the morphology of the sample was relatively even and the amount of cracks was relatively low. Compared to the corrosion resistance of magnesium substrate, the corrosion potential of conversion film was increased by about 0. 075 V ,and the corrosion current density decreased by nearly 1 order of magnitude. When the condition was 20 g / L NaMoO4 , 8 g / L KMnO4 at 50 ℃ and pH 5 for 40 min, the morphology of the sample was the most even and the amount of cracks was the least. Compared to the corrosion resistance of magnesium substrate, the corrosion potential of conversion film was increased by about 0. 047 V ,and the corrosion current density decreased by nearly 2 orders of magnitude. EIS showed that the polarization resistance of the latter conversion film sample was 1450. 2 Ω, while the polarization resistance of magnesium matrix was 806. 4 Ω. Conclusion Mo-Mn chromium-free conversion coating could obviously improve the surface corrosion resistance of AZ91D magnesium alloy. |
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