朱明,朱青,余勇,许雄.沉积时间对镁合金表面 Ca-P 生物涂层耐蚀性能的影响[J].表面技术,2016,45(5):162-168.
ZHU Ming,ZHU Qing,YU Yong,XU Xiong.Effect of Deposition Time on the Corrosion Resistance of Ca-P Coating on the Surfaces of Mg-based Alloy Prepared by Electrodeposition Method[J].Surface Technology,2016,45(5):162-168 |
| 沉积时间对镁合金表面 Ca-P 生物涂层耐蚀性能的影响 |
| Effect of Deposition Time on the Corrosion Resistance of Ca-P Coating on the Surfaces of Mg-based Alloy Prepared by Electrodeposition Method |
| 投稿时间：2016-01-16 修订日期：2016-05-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.05.025 |
| 中文关键词: 电沉积 镁合金 极化曲线 耐蚀性 DCPD |
| 英文关键词:electrodeposition magnesium alloy polarization curve corrosion resistance DCPD |
| 基金项目:国家自然科学基金(51201131)；陕西省科技新星项目(2013KJXX-42) |
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| Author | Institution |
| ZHU Ming | College of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China |
| ZHU Qing | 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 |
| XU Xiong | 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 镁合金在生物医学领域具有很好的应用前景，为消除其在人体环境中降解速度过快的不足，需在镁合金表面制备一层能够降低其腐蚀速度且具有很好生物相容性的防护涂层。 方法 采用电沉积法在 AZ91D 镁合金表面制备 Ca-P 生物涂层，沉积条件为：在 Ca(NO3)2和 NH4H2PO4浓度分别为 0.1mol/L 和 0.06 mol/L 的电解液中， pH 值 4.5，沉积电压 2 V，沉积时间分别为 1、 2、 3 和 4 h。采用 XRD、SEM/EDS 分析 Ca-P 涂层的相结构、微观形貌和化学成分，测试 Ca-P 涂层在 Hank， s 模拟体液中的极化曲线。 结果 镁基体表面均获得物相为 DCPD(二水合磷酸氢钙)的生物涂层，但涂层表面形貌随沉积时间的不同变化明显，当沉积时间为 3 h 时，涂层颗粒尺寸均匀、细小，涂层钙磷比为 1.324。极化曲线结果表明，沉积 1 h 时涂层对基体已有一定的防护作用，随着沉积时间的加长，涂层的腐蚀电压也呈增大趋势。相对镁基体，沉积 3 h 的涂层腐蚀电位升高了 180 mV，腐蚀电流密度降低了 3 个数量级。结论 当沉积时间为 3 h 时，涂层的耐蚀性最好。 |
| 英文摘要: |
| Objective Magnesium alloy possesses a good potential application in the biomedical filed, to overcome its overly rapid degradation speed in human environment, a protective coating with good biological compatibility should be deposited on the surface of magnesium alloy. Methods Ca-P bioactive coatings were prepared on the surface of AZ91D magnesium alloy by electrodeposition method. The deposition conditions were: 0.1 mol/L of Ca (NO3)2, 0.06 mol/L of NH4H2PO4, pH=4.5, deposition voltage 2 V, and deposition time 1 h, 2 h, 3 h, 4 h, respectively. The phase structure, microstructure and chemical composition of Ca-P coating were analyzed by XRD and SEM/EDS, and the polarization curves of Ca-P coating in Hank’s solution were tested. Results The results showed that DCPD coating was prepared on the surface of magnesium substrate by electrodepositon. The microstructure changed obviously with time and when the deposition time was 3 h, the particle size of the coating surface was the most uniform and fine, and the Ca-P ratio was 1.324. Polarization curve results showed that when the deposition time was 1 h the coating had produced protection for magnesium substrate. The corrosion voltage showed an increasing trend with prolongation of time, but the corrosion current reached the lowest. The corrosion potential of the coating was increased by 180 mV, and the corrosion current density was decreased by 3 orders of magnitude compared with the magnesium matrix. Conclusion The corrosion resistance of Ca-P coating was the best when the deposition time was 3 h in this paper. |
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