吴海江,杨飞英,邹利华,王小明,曾娣平,郭文敏.镁合金表面铈盐掺杂硅烷膜的腐蚀电化学行为[J].表面技术,2017,46(9):209-214.
WU Hai-jiang,YANG Fei-ying,ZOU Li-hua,WANG Xiao-ming,ZENG Di-ping,GUO Wen-min.Electrochemical Corrosion Behavior of Cerium Salt Doped Silane Composite Films on AZ91D Magnesium Alloy[J].Surface Technology,2017,46(9):209-214 |
| 镁合金表面铈盐掺杂硅烷膜的腐蚀电化学行为 |
| Electrochemical Corrosion Behavior of Cerium Salt Doped Silane Composite Films on AZ91D Magnesium Alloy |
| 投稿时间：2017-03-15 修订日期：2017-09-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2017.09.033 |
| 中文关键词: 铈盐 γ-氨丙基三乙氧基硅烷 AZ91D镁合金 开路电位-时间曲线 电化学阻抗谱 耐蚀性 |
| 英文关键词:cerium salt γ-aminopropyltriethoxysilane AZ91D magnesium alloy open circuit potential-time curve electrochemical impedance spectroscopy corrosion resistance |
| 基金项目:湖南省自然科学基金资助项目（2015JJ2064）；湖南省教育厅资助科研项目（15B213）；邵阳市科技计划项目（2016FJ07） |
| 作者 | 单位 |
| 吴海江 | 邵阳学院 机械与能源工程系，湖南 邵阳 422000 |
| 杨飞英 | 邵阳学院 机械与能源工程系，湖南 邵阳 422000 |
| 邹利华 | 邵阳学院 机械与能源工程系，湖南 邵阳 422000 |
| 王小明 | 邵阳学院 机械与能源工程系，湖南 邵阳 422000 |
| 曾娣平 | 邵阳学院 机械与能源工程系，湖南 邵阳 422000 |
| 郭文敏 | 邵阳学院 机械与能源工程系，湖南 邵阳 422000 |
|
| Author | Institution |
| WU Hai-jiang | Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China |
| YANG Fei-ying | Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China |
| ZOU Li-hua | Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China |
| WANG Xiao-ming | Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China |
| ZENG Di-ping | Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China |
| GUO Wen-min | Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China |
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| 中文摘要: |
| 目的 为进一步提升镁合金表面常规硅烷膜的耐蚀性能。方法 在γ-氨丙基三乙氧基硅烷溶液中掺杂0.50 g/L硝酸铈，采用简单化学浸渍处理，在AZ91D镁合金基体表面制备了铈盐掺杂硅烷膜。借助扫描电子显微镜（SEM）观察了铈盐掺杂前后硅烷膜的表面微观形貌，通过开路电位-时间曲线、电化学交流阻抗谱（EIS）和中性盐雾试验（NSS）研究了铈盐掺杂对5% NaCl溶液中硅烷膜耐蚀性能的影响。结果 铈盐掺杂硅烷膜比普通硅烷膜更厚且平整，其致密性、均匀一致性较好，完全覆盖了镁合金基体，已看不到磨痕。铈盐掺杂硅烷膜的稳定电位约为−1.31 V，且需要的稳定时间最长。铈盐掺杂硅烷膜具有更大的低频阻抗数值，有效遏制了侵蚀性粒子向镁合金基体的迁移和扩散，避免了镁合金基体发生阳极溶解反应。结论 采用向硅烷溶液中添加硝酸铈的方法，能够在AZ91D镁合金表面制备出铈盐掺杂硅烷膜。由于铈离子在某种程度上修复了硅烷膜层中的微裂纹和缺陷，显著提升了硅烷膜的耐蚀能力。 |
| 英文摘要: |
| The work aims to further improve corrosion resistance of conventional silane films on AZ91D magnesium alloy. The γ-aminopropyltriethoxysilane solution were doped with 0.50 g/L cerium nitrate to prepare cerium salt-doped silane films on AZ91D magnesium alloy by simple chemical immersion treatment. Surface morphology of the silane films before and after being doped with cerium salt was observed with scanning electron microscopy (SEM). Effects of cerium salt doping on corrosion resistance of the silane films in 5% NaCl solution were studied based upon open circuit potential-time curves, electrochemical impedance spectroscopy (EIS) and neutral salt spray test. Cerium salt-doped silane films were more smooth and uniform, thicker and denser than that of the conventional silane films. The magnesium alloy substrate was completely covered and no polishing scratch was seen. Stable potential of the cerium salt-doped silane films was about −1.31 V, and it needed longer stabilization time. The cerium salt-doped silane films produced a larger low-frequency impedance value, thus effectively inhibiting the migration and diffusion of erosive particles toward the magnesium alloy substrate, and avoiding anodic dissolution of magnesium alloy substrate. By adding cerium nitrate to silane solution, the cerium salt-doped silane films could be prepared on AZ91D magnesium alloy. Corrosion resistance of the silane films was improved significantly because micro cracks and defects on the silane films were repaired to some extent by cerium ions. |
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