-
摘要：防护与装饰性电镀工艺在国内外获得极其广泛的应用，在钢铁基体上广泛使用的防护性镀层主要是锌镀层。镀锌工艺分为氰化物镀锌、酸性镀锌和碱性镀锌三类。由于氰化物镀锌的有毒性，其在市场上被限制使用。镀锌是所有电镀中成本最低廉的，而且具有抗腐蚀性好、外表美观和耐贮藏等优点，所以在轻工、仪表、电机、国防、建筑五金等工业中得到广泛的应用。
- 上一篇：介孔氧化铁/碳复合物的制备及其电化学性能的研究
- 下一篇：铜萃取有机物影响下氧化亚铁钩端螺旋菌吸附和浸铜行为研究
碱性镀锌是主要镀锌工艺之一，而且因为其基础槽液组成简单，易于管理，不含氰化物，且金属离子浓度低，有利于防止污染和公害。镀层外观光亮细致，钝化膜色泽均匀，抗蚀性能优良，符合环保清洁生产的要求，因此获得了普遍应用。碱性无氰镀锌工艺的核心技术是光亮添加剂，近十几年来，国内外对此开展了大量研究。但碱性镀锌的镀锌层的耐蚀性与氰化物镀锌尚有差距。课题希望通过对碱性镀锌工艺的工艺评价，获取具有较好覆盖能力、分散能力及较好防护能力的镀锌工艺。为此，我们查找了典型碱性镀锌工艺配方，对不同碱性镀锌工艺进行镀层实施及镀层质量评价，并且对碱性镀锌工艺进行质量优化以期替代氰化物镀锌。36475
毕业论文关键词：碱性镀锌；光亮剂；氧化锌；氢氧化钠；赫尔槽
Technology research of alkaline zinc plating
Abstract:Protective and decorative plating technology get extremely widespread application at home and abroad ,the widely used protective coating on steel substrate is mainly zinc plating.Galvanized process is pided into three types,that is cyanide zinc plating, acidic galvanized and alkaline zinc plated.Due to the cyanide zinc plating is toxic , its use is limited in the market.Galvanizing is the most low cost of all the plating, and is characterized by good corrosion resistance, beautiful appearance and the advantages of resistance to storage, so it was widely used in the light industry, instrumentation, electrical, defense, building hardware and other industries.
Alkaline zinc is one of the main zinc plating, and because its basic bath composition is simple, easy to govern, do not contain cyanide, and the concentration of metal ion is low, to prevent pollution and pollution.Coating appearance look bright in detail, the color of passivation coating is uniform , excellent corrosion resistance, accord with the requirement of environmental protection cleaner production, thus gained widespread application.The core of the basic no cyanide zinc plating technology is the bright additive, in recent years, both at home and abroad to carry out a large amount of research.But the corrosion resistance of alkaline galvanized zinc coating is not good as cyanide zinc plating .Project hope the evaluationin of alkaline zinc plating process , acquisition a zinc plating who has good covering power, dispersing ability and better protection .To this end, we find the typical alkaline zinc plating formula for different alkaline zinc plating coating and evaluat the coating quality , and optimize the alkaline zinc plating quality in order to replace cyanide zinc plating.
Keywords: Alkaline zinc plating; Brightening agent; Nihil album; Caustic soda; Hull cell
目录
1 绪论 1
1.1电镀的简介 1
1.1.1 电镀的结晶过程 2
1.2电镀的发展及其现状 3
1.3 电镀锌的原理及其应用 4
1.3.1 锌的性质与用途 4
1.3.2 电镀锌的过程 5
1.3.3 电镀锌的应用 5
1.4 工业镀锌的种类及其特点 5
1.5 碱性镀锌工艺及其研究现状 7
1.5.1 镀液成分和规范的影响 7
1.6 本课题研究的内容及意义 11