【作者】 金文峰；

【导师】 赵麦群；

【作者基本信息】 西安理工大学 ， 材料学， 2006， 硕士

【摘要】 本文对振动磨制备片状锌粉的工艺、国内外片状锌粉的物理性能及表面改性方法进行了系统的研究,并应用改性后片状锌粉对锌基水性耐蚀涂层处理液的组成及配制工艺进行了探讨,得出了优化配方,主要研究结果如下:1.结合振动磨的工作原理和特点,经过干湿法比较,选择了湿法工艺进行研磨。通过测试粉末水面遮盖率、松装密度及粒度分布等变化情况,发现锌粉变形分为片状化变形阶段和断裂碎化两个阶段,在研磨过程中呈现粒径先增加后减小的规律。2.通过研磨机理及制备工艺的分析,探索出了适合振动磨制备片状锌粉的一套优化工艺参数。在此工艺条件下得到的片状锌粉,其平均粒径为与进口粉相当,径厚比较高,可以满足锌基水性耐蚀涂层使用要求。3.比较国内外片状锌粉的物理性能发现,与进口粉相比,国产片状锌粉表面粗糙,径厚比小,水面遮盖率较低,在水性溶液中分散稳定性很差,需要对其进行表面改性。4.采用机械力化学抛光方法对片状锌粉进行表面改性处理,研究了表面改性试剂对分散稳定性的影响,优化了抛光工艺参数,改性试剂选择钛酸酯偶联剂效果最佳,最佳加量为1%(Wt)。改性后的片状锌粉表面质量有了明显改善,水面遮盖率增加显著,其在水溶液中的分散稳定性超过了进口粉的水平。5.改性后的片状锌粉分散稳定性能优异,处理液配制工艺中锌粉分散不需另加分散剂,只需添加微量润湿剂提高润湿速度。预调节铬酸溶液pH值可以有效降低锌粉在处理液中的腐蚀速率,抑制还原剂和铬酸在配制过程中发生氧化还原反应,改善处理液稳定性以及涂层性能,最佳pH值为2。6.研究了涂层处理液各组分对处理液及涂层性能的影响,确定了处理液主要组成成分,用正交实验,优化了处理液配方。使用改性片状锌粉和优化配方,得到的锌基水性耐蚀涂层耐蚀性能优异,具有良好的外观和结合强度,也证明了配方的合理性及改性后片状锌粉在涂层中的良好表现。更多还原

【Abstract】 The study focused on the manufacture technology of zinc flake by vibration mill, the physical characteristics of the interior and imported zinc flake, the surface treatment technology of zinc flake. Further more the preparation technology and the composition component of zinc-based waterborne anticorrosive coatings was investigated. The main results are as follows:1.According as the characteristic of the vibration mill, the results of comparison between dry and wet milling method show that the wet milling method is more favorable. The process of vibration grinding was studied and discussed by testing the water covering capacity、the loose density and the size distribution, it’s could be find that the procedure of grinding contains flaky and cracked deformation, the grain size of zinc flake increased at the beginning and decreased subsequent.2.The important parameters of milling process were investigated and a set of optimized technique was developed. The grain size of zinc flakes prepared by this technology is similar to the imported zinc flake and with high value on the ratio between diameter and thickness. It can be used to prepare zinc-based waterborne anticorrosive coatings.3. Compared to the imported zinc flake, the surface state of interior was roughness, the ratio between diameter and thickness and the water covering power was low, and the dispersion stability in the water solution was poor.4.The interior zinc flake was surface treatmented by mechano-chemistry polishing method. The effect of surface modifier on the dispersion stability was discussed, the results indicated that the titanium coupling agent was more effective than other modifying agent, the optimally additions were 1%. Wt. Through the surface treatment the surface of zinc flake was well flattened and polished, the water covering power was improved obviously, the dispersion stability of zinc flake surpassed the level of imported.5.By right of the well dispersion stability in water solution, just a small amount of wetting agent was needed to accelerate the wetting speed during the process of mixing compositions and it’s dispensed with any other dispersant agent. With adjustment of pH value of chromic acidsolution the corrosion speed of zinc flake in the composition solution was reduced availably, the reducing reaction between organic reducing agent and chromic acid was controlled and the stability of composition and the performance of coatings were improved effectively. The best pH value of chromic acid solution is 2.0.6.The effect of essential components on the performance of composition and coating was analyzed and the recipe of composition was optimized by orthogonal test. The coatings prepared with optimum conditions has excellent stain resistance, good surface appearance and bond strength.更多还原