过氧化氢柠檬酸无铬钝化剂的研制+文献综述
关键词：钝化剂 过氧化氢 柠檬酸
Development of no chromium passivation agent
Abstract：Passivating agent is a kind of common metal corrosion inhibitor, most industrial applications of metal and metal coating (such as iron, zinc, aluminum, tin, lead, magnesium and its alloy) can generate chemical conversion film on the chemical reaction rules, used to improve the corrosion resistance of metal. Chemical conversion film with various processing methods, mainly phosphating and passivation etc.. This topic using hydrogen peroxide as main ingredients, adding proper rinsing agent -- citric acid, to develop a chromium-free passivating agent, and explore the passivation agent operating conditions, the analysis of main factors affecting passivation effect. Experiments show that, in the hydrogen peroxide passivation, when the dose of hydrogen peroxide in the 0.3% ~ 0.5% (initial concentration), passivation liquid pH 9 ～ 10, passivation liquid temperature is 50 ℃ ~ 60 ℃, passivation time reaches 4 h, citric acid solution is 4%, you can get excellent passivation effect.
Keywords: passivation agent, hydrogen peroxide and citric acid
目录
1 概述.. .5 1.1无机钝化剂的概述.. ..5
1.1.1钼酸盐.5
1.1.2 钨酸盐. 6
1.1.3硅酸盐.. ..6
1.1.4含锆溶液. 7
1.1.5含钴溶液7
1.1.6稀土金属盐7
1.1.7过氧化氢钝化7
1.2有机类钝化处理9
1.2.1二氨基三氮及其衍生物钝化9
1.2.2植酸钝化10
1.2.3单宁酸钝化10
1.2.4有机硅烷钝化10
1.2.5丙烯酸树脂钝化11
1.3本课题的研究目的内容11
2实验12
2.1主要原料与仪器设备12
2.1.1主要原料12
2.1.2仪器设备15
2.2 试验方法15
2.2.1 溶液配制 15
2.2.2钝化15
3结果与讨论16
3.1钝化机理16
3.2 过氧化氢剂量对钝化效果的影响16
3.3 钝化液pH值对钝化效果的影响17
3.4钝化液温度对钝化效果的影响17
3.5 钝化时间对双氧水钝化效果的影响18
3.6 柠檬酸剂量对钝化效果的影响19
4结论20
致谢21
参考文献22
1 概述
钝化剂是一种常见的金属防腐蚀剂，目前大多数工业应用的金属及镀层金属（如铁、锌、铝、锡、铅、镁等及其合金）均可在规定的化学反应中生成化学转换膜，用于提高金属耐蚀性。化学转换膜有多种处理方式，主要有磷化和铬酸盐钝化等。其中，铬酸盐钝化处理形成铬基体金属的混合氧化物膜层，膜层中主要以三价铬和吹冰价铬的形成存在，研究发现，三价铬作为骨架，而吹冰价铬则有自我修复的功能，因而耐蚀性极佳。但是，人们意识到，吹冰价铬有毒，含铬废水造成环境污染。随着近年来环境问题的凸显，国家出台相关法规条例来限制铬酸盐钝化的应用，世界各国也已积极探寻和研究替代铬酸盐钝化的新的表面处理方法，使金属钝化工艺朝着无铬方向来发展。
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