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文章编号： 1672-6987（2024）02-0091-09； DOI： 10.16351/j.1672-6987.2024.02.011
李福振， 孙瑞雪*(青岛科技大学 材料科学与工程学院，山东 青岛 266042)
摘要： 镁和镁合金的高化学活性以及氧化膜的疏松多孔导致镁合金的耐腐蚀性能较差。以AZ31B镁合金为基体，采用水热法在镁合金表面制备出二氧化铈/硬脂酸超疏水涂层，重点研究了水热反应温度和时间对涂层形貌及耐腐蚀性能的影响。通过X射线衍射(XRD)、扫描电子显微镜(SEM)和能谱(EDS)对镁合金表面涂层的相组成、微观形貌及元素组成进行测试，通过电化学测试来表征二氧化铈/硬脂酸超疏水涂层的耐腐蚀性能，利用超疏水测试检验涂层的疏水性。结果表明：当水热反应温度为120 ℃，反应时间为6 h时，可以在镁合金表面制备出均匀的涂层，该涂层由大量细小球形颗粒紧密连接而成，涂层致密完整，厚度约为13 μm，涂层主要组成相为CeO2。电化学测试结果表明：与空白镁合金基体相比，二氧化铈/硬脂酸复合涂层的腐蚀电流密度为536 × 10-6 A·cm-2，降低了一个数量级，且其电化学容抗弧直径明显增大，说明该涂层可以显著提高镁合金基体的耐腐蚀性能。同时，该涂层还具有较好的超疏水性，水滴静态接触角达161°。
关键词： AZ31B镁合金； 二氧化铈/硬脂酸； 超疏水涂层； 耐腐蚀性
中图分类号： TG 146.2+2文献标志码： A
引用格式： 李福振，孙瑞雪.镁合金表面二氧化铈/硬脂酸超疏水涂层的制备及其耐蚀性［J］. 青岛科技大学学报(自然科学版), 2024, 45（2）： 91-99.
LI Fuzhen, SUN Ruixue. Preparation and corrosion resistance of CeO2 / stearic acid superhydrophobic coating on magnesium alloy［J］. Journal of Qingdao University of Science and Technology（Natural Science Edition), 2024， 45（2）： 91-99.
Preparation and Corrosion Resistance of CeO2 /Stearic Acid
Superhydrophobic Coating on Magnesium Alloy
LI Fuzhen, SUN Ruixue
(College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)
Abstract: Magnesium alloy, as the lightest engineering metal material, has high damping capacity and heat conductivity, high specific stiffness and specific strength, high recovery and excellent anti electromagnetic interference performance. Therefore, magnesium alloy has a broad prospect in aviation and automobile industry. However, the high chemical activity of magnesium and its porous oxide film lead to low corrosion of magnesium alloy. Super hydrophobic surface gives magnesium alloy super hydrophobic ability, which makes it difficult for corrosion medium to penetrate into super hydrophobic surface, and improves corrosion resistance of magnesium alloy. In this paper, cerium oxide/stearic acid superhydrophobic coating was prepared on the surface of AZ31B magnesium alloy. The effect of temperature and time of hydrothermal reaction on the corrosion resistance of the coating was studied. The phase composition, microstructure and element composition of the coating on the surface of magnesium alloy were tested by X-ray diffraction (XRD), scanning electron microscope (SEM) and EDS. The corrosion resistance of CeO2/stearic acid superhydrophobic coating was characterized by electrochemical test, and the hydrophobicity of the coating was tested by ultra-hydrophobic test. It is found that 120 ℃ and 6 h are the best temperature and time for hydrothermal reaction. Under this condition, the coating with the thickness of about 13 μm is composed of a large number of fine spherical particles closely connected with each other, which is dense and complete. The phase composition of the coating is CeO2. Electrochemical test results show that the corrosion current density of the CeO2/stearic acid composite coating is 536 × 10-6 A·cm-2, which is reduced by an order of magnitude compared with that of the bare magnesium alloy substrate. And the diameter of the electrochemical capacitive of arc the composite coating increases obviously, indicating the enhanced corrosion resistance of magnesium alloy substrate. At the same time, the composite coating also has good superhydrophobicity, and the static contact angle of water is 161°.
Key words: AZ31B magnesium alloy; CeO2/stearic acid； superhydrophobic coating; corrosion resistance.
收稿日期： 2023-05-08
基金项目： 山东省自然科学基金面上项目（ZR2021ME053）.
作者简介： 李福振（1999—），男，硕士研究生.*通信联系人.
