《铝合金表面处理论文》由会员分享，可在线阅读，更多相关《铝合金表面处理论文（17页珍藏版）》请在金锄头文库上搜索。
1、摘要本论文分为两部分，第一部分为聚天冬氨酸改性的锆转化膜耐蚀性研究；第二部分为具自修复 性的杂多酸改性锆系转化膜研究。（1）采用浸渍法常温下在铝合金表面制备出一种高耐蚀性、高稳定性、高附着力的新型有机 无机复合转化膜。用重铬酸钾点滴试验、电化学工作站、场发射扫描电镜、X射线光电子能谱（XPS） 等方法对膜层耐蚀性、微观形貌及化学组成进行表征，并采用退膜试验、耐水煮试验，抗杯凸试验 和转化液稳定性试验对复合转化膜的膜重及附着力，转化液的稳定性进行了测试分析。结果表明： 聚天冬氨酸的加入量在0.5l.Og/L时获得的转化膜耐蚀性最佳，相应的电化学拟合阻抗为64.26kQ； 通过聚天冬氨酸的加入可以
2、改变膜层表面形貌，使得膜层有机物组分碳氧化合物的含量增加；此外 聚天冬氨酸也使得膜层更为致密且耐盐水浸泡时间更长，但有机物的加入会使得膜重增加，不利于 器材轻量化。通过对XPS数据分析，该复合转化膜主要成分是ZrO2、ZrOF2及其有机络合物，这种 环境友好的转化膜，有望取代铬酸盐处理工艺。（2）以钨酸钠、偏钒酸钠、氟锆酸钾为成膜主盐，氟硼酸及硝酸镁为促进剂常温下利用浸渍法在 铝合金表面制备了具自修复性的杂多酸改性锆系转化膜。实验同时研究了转化液pH值，转化温度 及转化时间对钒锆复合膜层耐蚀性的影响。通过重铬酸钾点滴试验、电化学工作站、XPS、场发射 扫描及能谱（EDS）等测试手段研究了不同氧
3、化剂添加后膜层的微观形貌及耐蚀机理。结果表明： 双氧水和钨酸钠可以增加钒锆转化膜的耐蚀性，其中钨酸钠表现出来的自修复性能更加明显；过硫 酸铵和高锰酸钾会降低钒锆转化膜的耐蚀性，并且膜层没有表现出期望的自修复性能。在实验条件 优化的基础上对钨钒杂多酸锆系转化膜进行了详细的XPS检测分析其自修复机理，结果表明成膜过 程中钨钒杂多酸颗粒会夹杂在锆的沉积物并且主要沉积在膜层底部，当膜层受到腐蚀介质攻击时， 钨钒杂多酸和铝基体及其内部复杂的杂多酸平衡体系将受到破坏，杂多酸会在腐蚀介质穿入微孔时 发生聚合和氧化还原反应，包裹在钒酸根周围的钨酸根在酸性环境下会氧化钒元素使钒元素复归于 高价态，杂多酸对铝基体
4、还会产生二次钝化，使得受到破坏的氧化膜更加致密，宏观上起到自修复 作用。关键词：铝合金；耐蚀性；转化膜；自修复；聚天冬氨酸；钨钒杂多酸AbstractThis paper includes two parts. The first part was a study on a polyaspartic modified on aluminum zirconium-based conversion. The second part was about self-repairing tungstovanadate-zirconium conversion coating.(1) In this wo
5、rk, the composite conversion coating on aluminum alloys was performed by immersion in a solution containing polyaspartic. Spot test, electrochemical workstation, scanning electron microscopy, X-ray photoelectron spectroscopy (XPS) and other methods detected coating corrosion resistance, chemical com
6、position and microstructure characterization, by adopt Stripping, water cook test, anti-Cupping test and conversion solution stability test discussed conversation coatings weight and adhesion, stability of conversion liquid composite. The results showed that: when polyaspartic added in the amount of
7、 0.51.0g/L obtained the coating was of good corrosion resistance, corresponding electrochemical impedance fitting 64.26kQ, polyaspartic acid by the addition may be changed coatings surface morphology, so that the content of the coating component of organic matter and oxygen compounds increases; in a
8、ddition polyaspartic also makes the film more dense salt water soak longer, but the addition of organic matter will make the film weight increases, It is not conducive to lightweight equipment. By XPS data analysis, the main component of the composite conversion coating ZrO2, ZrOF2 and organic compl
9、exes, the2, 2composite conversion coating is friendly to environment.(2) In this work, self-repairing tungstovanadate-zirconium conversion coating (TZO) coating on alloy surfaces was performed by immersion in a solution containing tungstovanadate. The research also studied the influence of pH value，
10、temperature and immersion time on the conversion of vanadium-zirconium composite coating corrosion resistance. By potassium dichromate spot test, electrochemical workstation, XPS, and field emission scanning spectroscopy (EDS) testing methods discussed the influence of different oxidizing on convers
11、ion coatings microstructure and corrosion mechanism. The results showed that: hydrogen peroxide and tungstovanadate-zirconium conversion coating can increase the corrosion resistance, among them tungstovanadate-zirconium demonstrated the obvious self-repairing performance, ammonium persulfate and po
12、tassium permanganate can reduce the corrosion resistance of vanadium-zirconium conversion coating and didnt show the desired self-healing properties. XPS results showed that when TZO is forming tungstovanadate particles can suspend in the coatings, when the coating was attacked by corrosive media, t
13、ungsten, inner tungstovanadate balance system will be undermined and when chloride penetrating pores occurred secondary protection, conversion coatings re-passivity delaying the occurrence of corrosion. Vanadium element reverted to the high state, heterophony acid aluminum body will produce secondar
14、y passivity, make conversion coating more compact, conversion coatings re-passivity delaying the occurrence of corrosion.Key Words: Aluminum Alloys; Corrosion Resistance; Conversion Coating; Polyaspartic;Self-repairing; Tungstovanadate目录学位论文原创性声明和学位论文版权使用授权书错误！未定义书签。摘 要 IAbstractII插图索引 VI附表索引VII第 1
15、章 绪 论 81.1 铝合金的性能特点 81.2 化学预处理81.3 无铬转化膜111.3.1 陶化膜技术 121.3.2 钒酸盐转化膜 141.4 转化膜自修复原理 151.5 论文研究目的及意义 161.6 论文的研究内容 16第 2 章 铝合金表面改性锆系复合转化膜研究 错误！未定义书签。2.1 前言 错误！未定义书签。2.2 实验材料 错误！未定义书签。2.2.1 化学试剂 错误！未定义书签。2.2.2 实验设备 错误！未定义书签。2.2.3 样板制备 错误！未定义书签。2.2.4 制备工艺 错误！未定义书签。2.3 分析检测方法 错误！未定义书签。2.3.1 电化学性能 错误！未定义
16、书签。2.3.2 微观形貌及成分分析 错误！未定义书签。2.3.3 加速腐蚀实验 错误！未定义书签。2.3.4 膜层性能检测 错误！未定义书签。2.4 工艺参数对膜层性能的影响 错误！未定义书签。2.4.1 硝酸镁的影响 错误！未定义书签。2.4.2 氟锆酸钾的影响 错误！未定义书签。2.4.3 转化处理时间对锆转化膜的影响 错误！未定义书签。2.4.4 转化液 pH 值对锆转化膜的影响错误！未定义书签。2.4.5 转化温度对锆转化膜的影响 错误！未定义书签。2.5 复合转化膜的性能分析 错误！未定义书签。2.5.1 Tafel曲线分析错误！未定义书签。2.5.2 电化学阻抗谱分析错误！未定义书签。2.5.3 SEM分析错误！未定义书签。2.5.4 XPS分析错误！未定义书签。2.5.5转化膜涂装性能
