添加 TiO2 纳米粒子后 AZ31B 镁合金等离子电解质氧化涂层的疏水性能、耐磨性和耐腐蚀性得到增强

IF 44 1区医学 Q1 ENDOCRINOLOGY & METABOLISM

The Lancet Diabetes & Endocrinology Pub Date : 2024-10-11 DOI:10.1016/j.ceramint.2024.10.145

Kunlong Zhang, Weihua Zhang, Yue Yang, Xiangyu Sun, Boxuan Men, Sirong Yu

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引用次数: 0

摘要

通过等离子体电解质氧化（PEO）在碱性电解质中加入纳米 TiO2，然后在月桂酸乙醇溶液中进行低表面能改性，在 AZ31B 镁合金上制备了纳米复合涂层。形成了由氧化镁、Mg2SiO4、锐钛矿-TiO2、金红石-TiO2 和 Mg2TiO4 组成的双层纳米复合 PEO 涂层，TiO2 纳米颗粒通过惯性和反应两种模式与 PEO 涂层结合。此外，TiO2 纳米粒子的渗透和吸附在涂层厚度方向上形成了分布梯度。添加了 4 g/L TiO2 纳米粒子的 PEO 涂层的磨损率分别比裸基体低约 82%和比未添加 TiO2 的 PEO 涂层低约 39%。耐磨性的提高是由于涂层的摩擦系数（COF）比不含 TiO2 的涂层低、微硬度比不含 TiO2 的涂层高、微结构更致密、微孔更细小、微裂纹更少的协同效应。此外，在电解液中加入 TiO2 纳米粒子后，低表面能改性 PEO 涂层的疏水性能得到了增强。此外，添加 4 g/L 的 TiO2 纳米粒子的 PEO 涂层的耐腐蚀性能也得到了显著提高。与其他浓度和未添加 TiO2 的涂层相比，它表现出更高的缓蚀效率和更低的腐蚀速率。抗腐蚀性能的改善源于涂层中形成了包括 TiO2 和 Mg2TiO4 在内的相，以及与其他浓度相比，添加了 4 g/L TiO2 纳米粒子的 PEO 涂层具有更致密的微观结构和更好的疏水性能。因此，含有 TiO2 纳米粒子的 PEO 涂层在镁合金保护领域具有显著的疏水、耐磨和耐腐蚀性能。

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Enhanced hydrophobic properties, wear and corrosion resistance of plasma electrolyte oxidation coatings on AZ31B magnesium alloys with addition of TiO2 nanoparticles

Nanocomposite coatings were fabricated on AZ31B magnesium alloy by means of plasma electrolyte oxidation (PEO) with the addition of TiO₂ nanoparticles into the alkaline electrolyte, followed by low surface energy modification in the ethanol solution of lauric acid. The dual-layered nanocomposite PEO coatings composed of MgO, Mg₂SiO₄, anatase-TiO₂, rutile-TiO₂, and Mg₂TiO₄ were formed, and the TiO₂ nanoparticles incorporated into the PEO coatings via both inertia and reactive modes. Besides, the penetration and adsorption of TiO₂ nanoparticles created a distribution gradient in the coating thickness direction. The wear rate of the PEO coatings with TiO₂ nanoparticles in 4 g/L was approximately 82% lower than that of the bare substrate and approximately 39% lower than that of the PEO coatings without TiO₂ addition, respectively. The enhancement in wear resistance was due to the synergistic effect of the lower coefficient of friction (COF), the higher microhardness and the denser microstructure with finer micropores and less microcracks on the coatings than that of the TiO₂-free coatings. Besides, the hydrophobic property was enhanced for the low surface energy modified PEO coatings with the addition of TiO₂ nanoparticles in the electrolyte. Moreover, a significant enhancement in the corrosion resistance was achieved for the PEO coating with the addition of TiO₂ nanoparticles in 4 g/L. It exhibited a higher corrosion inhibition efficiency and a lower corrosion rate than that in other concentrations and without TiO₂ addition. The improvement in anti-corrosion property was originated from the formation of phases including TiO₂ and Mg₂TiO₄ in the coating, and denser microstructure with better hydrophobic properties for the PEO coatings with TiO₂ nanoparticles in 4 g/L compared with that in other concentrations. Accordingly, the hydrophobic, wear-resistant and corrosion-resistant PEO coatings with TiO₂ nanoparticles exhibited significant advantages in the field of Mg alloys protection.

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来源期刊

The Lancet Diabetes & Endocrinology ENDOCRINOLOGY & METABOLISM-

CiteScore

61.50

自引率

1.60%

发文量

371

期刊介绍： The Lancet Diabetes & Endocrinology, an independent journal with a global perspective and strong clinical focus, features original clinical research, expert reviews, news, and opinion pieces in each monthly issue. Covering topics like diabetes, obesity, nutrition, and more, the journal provides insights into clinical advances and practice-changing research worldwide. It welcomes original research advocating change or shedding light on clinical practice, as well as informative reviews on related topics, especially those with global health importance and relevance to low-income and middle-income countries. The journal publishes various content types, including Articles, Reviews, Comments, Correspondence, Health Policy, and Personal Views, along with Series and Commissions aiming to drive positive change in clinical practice and health policy in diabetes and endocrinology.