张立功,文陈,李思振,冯立,白晶莹,崔庆新,王景润.镁合金黑色微弧氧化膜在 NaCl 溶液中腐蚀电化学演变[J].表面技术,2016,45(6):55-62.
ZHANG Li-gong,WEN Chen,LI Si-zhen,FENG Li,BAI Jing-ying,CUI Qing-xin,WANG Jing-run.Electrochemical Evolution of Corrosion Mechanism of Black Micro-arc Oxidation Film in NaCl Solution of Magnesium Alloys[J].Surface Technology,2016,45(6):55-62 |
| 镁合金黑色微弧氧化膜在 NaCl 溶液中腐蚀电化学演变 |
| Electrochemical Evolution of Corrosion Mechanism of Black Micro-arc Oxidation Film in NaCl Solution of Magnesium Alloys |
| 投稿时间：2016-03-10 修订日期：2016-06-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.06.009 |
| 中文关键词: 微弧氧化 磷酸盐 镁合金 NaCl 腐蚀 电化学 |
| 英文关键词:micro-arc oxidation phosphate magnesium alloy NaCl corrosion electrochemistry |
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| Author | Institution |
| ZHANG Li-gong | Beijing Spacecrafts, China Academy of Space Technology, 100190 Beijing, China |
| WEN Chen | Beijing Spacecrafts, China Academy of Space Technology, 100190 Beijing, China |
| LI Si-zhen | Beijing Spacecrafts, China Academy of Space Technology, 100190 Beijing, China |
| FENG Li | Beijing Spacecrafts, China Academy of Space Technology, 100190 Beijing, China |
| BAI Jing-ying | Beijing Spacecrafts, China Academy of Space Technology, 100190 Beijing, China |
| CUI Qing-xin | Beijing Spacecrafts, China Academy of Space Technology, 100190 Beijing, China |
| WANG Jing-run | Beijing Spacecrafts, China Academy of Space Technology, 100190 Beijing, China |
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| 中文摘要: |
| 目的 评价镁合金黑色微弧氧化热控膜层在氯离子作用下的腐蚀演变行为。 方法 在电解液中添加不同浓度的添加剂制备微弧氧化膜层，分析不同微弧氧化膜试样在 0.1 mol/L NaCl 溶液中的电化学演变过程。采用电化学极化、电化学交流阻抗表征和拟合，结合扫描电镜等方法，对膜层演变规律及机理进行了探讨。 结果 未经微弧氧化的镁合金自腐蚀电流密度为 17.7 μA/cm2，自腐蚀电位为-1.464 V；经微弧氧化后，试样自腐蚀电流密度减小至 0.09 μA/cm2，自腐蚀电位下降至-1.628 V。添加剂加入后制备的微弧氧化膜相比于镁合金基体，其耐蚀性能提高，且随着添加剂浓度的增加，耐蚀效果呈现先增加、后减弱的趋势，添加剂质量浓度在 10 g/L 时制备的膜层具有最好的防腐效果。镁合金微弧氧化热控膜层在 NaCl 溶液中腐蚀过程分为三个阶段：一是腐蚀性离子进入多孔膜层，引起界面熔融层变化；二是 MgO 与水分子反应造成内层膜更加致密，阻抗有所增加；三是腐蚀溶液接触到部分镁合金基底，发生电化学腐蚀，形成楔形效应，引发裂纹，最终导致局部腐蚀失效。 结论 微弧氧化提高了膜层的耐蚀性能，其在 0.1 mol/L NaCl 溶液中的腐蚀过程可分为介质进入孔内、水合反应和局部腐蚀三个阶段。 |
| 英文摘要: |
| Objective To evaluate the corrosion evolution behavior of black micro-arc oxide (MAO) film layer on magnesium alloy caused by chloride ion. Methods The electrochemical characteristics of the film were investigated using electrochemical polarization, electrochemical impedance spectrum (EIS) and scanning electron microscopy(SEM). Results The results showed that the potential and current were -1.464 V and 17.7 μA/cm2, while those of the micro-arc oxide specimens were reduced to -1.628 V and 0.09 μA/cm2, respectively. The addition of additive enhanced the corrosion properties compared to magnesium alloy. With increasing concentration of the additive, the corrosion property of the micro-arc oxide film first increased and then reduced. The optimized content was 10 g/L. The corrosion process of magnesium alloy could be divided into three processes. (1) Corrosive ions entered the film and caused changes of the melted interface. (2) The reaction happened between water and MgO, which led to density increase of the film. (3) Ions reached the magnesium and electrochemical corrosion occurred, forming wedge effect, which induced cracks and finally resulted in local corrosion failure. Conclusion The corrosion property of micro-arc oxide film was better than that of Mg alloy. The corrosion process could be divided to three stages: the entry of corrosive ions, reaction between water and MgO and local corrosion. |
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