纳米氧化钇基复合材料制备及其在环氧树脂涂料中的应用研究

发布时间：2018-06-25 12:01

  本文选题：纳米粒子 + Y2O3/CeO2复合　； 参考：《内蒙古科技大学》2015年硕士论文

【摘要】：环氧涂料是应用最多的一种防腐涂料，但是它也有质脆、易老化、耐蚀性能较差等缺点，因此对其进行改性以研制高性能的防腐涂层是现在研究的一个热点。由于稀土的氧化物纳米粒子具有非常好的耐热、耐酸碱、耐腐蚀等独特性能，并且价格实惠(如Y2O3和CeO2等)，用硅烷偶联剂对纳米Y2O3和Y2O3/CeO2复合材料进行改性，，加入到环氧树脂中，能提高其耐腐蚀性。 由于片层状纳米粒子有扁平结构，其表面能降低，经过硅烷偶联剂处理之后，能很好的分散在环氧树脂涂料中，制备钢板上防腐涂层，能阻止外部腐蚀性介质侵蚀，减小氧通过防腐涂层的速度，能防止钢板基体的氧化。因此，本文研究的重点是通过制备片层状纳米Y2O3和Y2O3/CeO2复合粒子，并制作环氧树脂在钢板上的防腐涂层。具体研究如下: 首先，制备片层状Y2O3纳米粒子，采用半开放体系的尿素均相沉淀法，通过改变制备工艺，得到Y2O3纳米粒子的前驱体，选择不同的烧结条件以制得片层状纳米Y2O3，从而确定其制备工艺为150℃温度下反应5h，在600℃下烧结3h。实验结果表明：反应温度越高，纳米片层状粒子越容易生成；随着烧结的温度的变低，片层状纳米粒子也更明显，堆积也越疏松。 然后，制备片层状Y2O3和CeO2复合纳米粒子，采用半开放体系的尿素均相沉淀法，通过改变制备工艺，得到Y2O3和CeO2复合纳米粒子的前驱体，选择不同的烧结条件以制得片层状纳米Y2O3/CeO2复合纳米粒子，从而确定其制备工艺为在150℃温度下反应5h，600℃下烧结3h。实验结果表明：铈的量越大，片层状越不明显，颗粒状也越多。这与钇和铈离子的空间结构有关；反应温度越高，片层状越明显，堆积也越疏松；烧结温度越高，片层状越不明显。 最后，制备防腐涂层。通过用硅烷偶联剂-560对Y2O3、CeO2和Y2O3/CeO2复合纳米粒子进行包覆改性，然后分别添加到环氧清漆防腐涂料中，制备304钢板上的防腐涂层。通过对其电化学阻抗性能的测试，并对添加的不同的纳米粒子进行对比分析，得出添加1:1的片层状纳米Y2O3/CeO2复合粒子的环氧树脂涂料的模值高于其他添加粒子。经过30天的模拟腐蚀盐溶液浸泡，空白板和纯环氧清漆的涂层发生腐蚀，涂层腐蚀严重；添加稀土成分的3种环氧漆涂层基本无腐蚀。说明在环氧树脂防腐漆中添加纳米稀土氧化物能提高其防腐性能。
[Abstract]:Epoxy coating is one of the most widely used anticorrosive coatings, but it also has the disadvantages of brittle, easy aging and poor corrosion resistance. Therefore, it is a hot research topic to modify epoxy coatings to develop high performance anticorrosive coatings. Because rare earth oxide nanoparticles have very good heat resistance, acid and alkali resistance, corrosion resistance and so on, and the price is affordable (such as Y _ 2O _ 3 and CEO _ 2), Nano-Y _ 2O _ 3 and Y _ 2O _ 3 / CeO _ 2 composites are modified by silane coupling agent and added to epoxy resin. It can improve its corrosion resistance. Because the lamellar nanoparticles have flat structure and their surface energy is reduced, after silane coupling agent treatment, they can be well dispersed in epoxy resin coating, and can be used to prepare anticorrosive coating on steel plate, which can prevent external corrosive medium from eroding. By reducing the speed of oxygen passing through the anticorrosive coating, the oxidation of the steel substrate can be prevented. Therefore, the focus of this study is to prepare laminated nano-Y _ 2O _ 3 and Y _ 2O _ 3 / CeO _ 2 composite particles and to prepare epoxy resin anticorrosive coating on steel plate. The specific research is as follows: firstly, the precursor of Y _ 2O _ 3 nanoparticles was obtained by changing the preparation process by using semi-open urea homogeneous precipitation method to prepare layered Y _ 2O _ 3 nanocrystalline particles. Different sintering conditions were selected to prepare lamellar nanometer Y _ 2O _ 3, and the preparation process was determined as follows: reaction at 150 鈩

本文编号：2065838