张菊梅,段鑫,王凯,张阳,蔡辉.水热反应温度对LA103Z镁锂合金表面MAO/LDH复合膜层微观组织及耐蚀性的影响[J].表面技术,2021,50(5):261-268, 280.
ZHANG Ju-mei,DUAN Xin,WANG Kai,ZHANG Yang,CAI Hui.Effect of Hydrothermal Temperature on Microstructure and Corrosion Behavior of MAO/LDH Composite Coatings on LA103Z Mg-Li Alloy[J].Surface Technology,2021,50(5):261-268, 280 |
| 水热反应温度对LA103Z镁锂合金表面MAO/LDH复合膜层微观组织及耐蚀性的影响 |
| Effect of Hydrothermal Temperature on Microstructure and Corrosion Behavior of MAO/LDH Composite Coatings on LA103Z Mg-Li Alloy |
| 投稿时间：2020-04-02 修订日期：2020-08-31 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.05.029 |
| 中文关键词: LA103Z镁锂合金 微弧氧化 LDH 水热温度 成膜机理 耐蚀性 |
| 英文关键词:LA103Z Mg-Li alloy micro-arc oxidation LDH hydrothermal treatment temperature film-forming mechanism corrosion resistance |
| 基金项目:陕西省教育厅专项科研计划项目(14JK1465);2019年陕西省大学生创新创业训练计划项目(S201910704049) |
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| Author | Institution |
| ZHANG Ju-mei | School of Materials Science and Engineering, Xi’an University of Science & Technology, Xi’an 710054, China |
| DUAN Xin | School of Materials Science and Engineering, Xi’an University of Science & Technology, Xi’an 710054, China |
| WANG Kai | School of Materials Science and Engineering, Xi’an University of Science & Technology, Xi’an 710054, China |
| ZHANG Yang | School of Materials Science and Engineering, Xi’an University of Science & Technology, Xi’an 710054, China |
| CAI Hui | School of Materials Science and Engineering, Xi’an University of Science & Technology, Xi’an 710054, China |
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| 中文摘要: |
| 目的 研究层状双金属氢氧化物(LDH)形成的水热反应机理，以及水热反应温度对LA103Z镁锂合金表面MAO/LDH复合膜层微观组织及耐蚀性的影响。方法 保持水热反应时间为18 h，改变水热反应温度，在微弧氧化陶瓷层(MAO)表面制备LDH膜层。将制得的Mg-Al LDH/MAO复合膜层置于3.5%NaCl溶液中，进行浸泡和析氢实验，使用XRD、SEM、EDS等测试手段对腐蚀前后的膜层进行表征。结果 不同水热反应温度下，均能在MAO陶瓷层表面形成细小针状结构，经XRD分析得到了LDH的特征衍射峰。在80、90、100 ℃条件下制备的LDH膜层，表面均匀，截面结构致密，而在120 ℃条件下制备的LDH膜层，表面针状组织尺寸更为粗大，分布更为密集，但截面蓬松。析氢实验中，在不同水热反应温度下，膜层析氢曲线的斜率由小到大依次为:80 ℃≈90 ℃<100 ℃<120 ℃<LA103Z基体。其中，80、90、100 ℃条件下制备的LDH膜层在浸泡8 d后，析氢量不足50 mL，远低于120 ℃条件下制备的膜层(析氢量为150 mL)。结论 水热反应过程中，首先在MAO陶瓷层表面形成Mg(OH)2，随后溶液中的Al3+取代部分Mg(OH)2中的Mg2+，形成LDH，最终生长成LDH膜层。在一定温度范围内，随制备温度的降低，Mg-Al LDH/MAO复合膜层的耐蚀性能逐渐增强，这与其表面及截面的微观结构密切相关。 |
| 英文摘要: |
| In order to study the hydrothermal reaction mechanism of layered double hydroxides (LDH) and the effect of hydrothermal treatment temperature on the microstructure and corrosion resistance of MAO/LDH composite coating, hydrothermal treatment temperature was changed, while hydrothermal time was maintained at 18 hours, and LDH were prepared on the surface of the MAO ceramic layer of LA103Z Mg-Li alloy. Then immersion experiment and hydrogen evolution experiment were carried out in a 3.5% NaCl solution. The composite coating was characterized by XRD, SEM, and EDS. After the hydrothermal treatment, fine texture structures can be formed on the surface of MAO coating at different hydrothermal temperatures. Through XRD analysis, the characteristic peaks of LDH were found. The surface of LDH coating prepared at 80 ℃, 90 ℃ and 100 ℃ was uniform and cross-section structure was dense. The size of texture structure of LDH coating prepared at 120 ℃ was coarser, and the surface was more densely, but cross section was fluffy. In the hydrogen evolution experiment, the slopes of hydrogen evolution curves of the composite coating at different hydrothermal temperatures showed 80 ℃≈90 ℃<100 ℃<120 ℃< LA103Z substrate. Among them, the amount of hydrogen evolution of the LDH coating prepared at 80 ℃, 90 ℃ and 100 ℃ for 8 days was less than 50 mL, which was much lower than 150 mL of 120 ℃. The results show that during the hydrothermal treatment, Mg(OH)2 is first formed on the surface of MAO ceramic layer, then Al3+ in the solution replaces the position of Mg2+ in Mg(OH)2 to form LDH, and finally grows into LDH coating. Within a certain temperature range, the corrosion resistance of Mg-Al LDH/MAO composite coating is gradually enhanced with the decrease of preparation temperature, which is closely related to its microstructure. |
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