摘要:本课题的目的在于研究出一种对环境低毒的三价铬钝化工艺,以用于取代毒性高的优尔价铬钝化工艺。通过单因素实验和正交试验,对钝化液中的各个组成成分和钝化的工艺条件一一进行探索和研究,得到了一个最佳的三价铬彩色钝化配方工艺。该工艺主要成膜物是Cr2(SO4)3•6H2O,含量为8g/L;配位剂为丙二酸,含量为5g/L;氧化剂是NaNO3,含量为5g/L;活化金属离子选NiSO4•6H2O,用量为1.2g/L;阴离子促进剂NaCl,用量0.5g/L;pH值1.6;钝化温度25℃;钝化时间80s。该工艺能够得到一层致密的三价铬彩色钝化膜钝化膜,外观光亮细致。对最佳配方工艺进行中性盐雾实验、附着力实验、乙酸铅点滴实验,结果表明,耐盐雾时间可达78小时,乙酸铅点滴实验出现黑点时间可达74秒,附着力良好。10348
关键字:镀锌;三价铬;彩色钝化;
Study on Trivalent Chromium Colorful Passivation Technology for Potassium chloride zinc plating
Abstract: The purpose of this project is to develop a low-toxicity of trivalent chromium passivation process on the environment, to be used to replace the high toxicity of hexavalent chromium passivation process. By single-factor experiment and orthogonal, passivation solution composition and passivation process carry out exploration and research, has been one of the best formula of trivalent chromium color passivation technology. The process of major film is Cr2(SO4)3•6H2O, content 8g/L; complexing agent for malonate, content 5g/L; oxidants is NaNO3, content 5g/L; activating metal ions selected NiSO4•6H2O, the dosage of 1.2g/L; anions promoter NaCl, 0.5g/L;Ph 1.6; passive temperature 25℃; passivated times of 80s. The process can be a dense layer of passive film on three price chromium colored passivation film and looks bright and detailed. Neutral salt spray test, the best formulation process experiment of adhesion test, lead-acid, showed that salt-fog resistance of up to 78 hours, lead-acid drop experiment appears black spots of up to 74 seconds, good adhesion.
KeyWords:galvanization;trivalent chromium;Color Passivation
目 录
1 引言 1
1.1 课题研究的概况及意义 1
1.2 课题研究的内容及目的 2
1.3 课题国内外研究的概况及趋势 2
1.4 本课题主要技术要求 3
2 技术原理 5
2.1 三价铬钝化成膜机理 5
2.1 钝化液各组分的作用 5
3 工艺研究方法 7
3.1 工艺研究方法 7
3.2 钝化膜性能测定、试验方法 8
4 实验研究 9
4.1 实验仪器、试剂、材料 9
4.1.1 主要仪器和材料 9
4.1.2 主要试剂 9
4.2 镀锌层的制备 9
4.2.1 镀锌液的配制 9
4.2.2 试片镀锌 9
4.3 基础钝化配方及工艺参数的确定 10
4.3.1 三价铬盐的选择 10
4.3.2 配位剂的选择 11
4.3.3 氧化剂的选择 12
4.3.4 金属活化离子的选择及其含量对钝化膜性能的影响 12
4.3.5 阴离子促进剂的选择 13
4.3.6 钝化操作条件确定 13
5 试验结果与讨论 15
5.1 Cr2(SO4)3•6H2O浓度的影响 15 氯化钾镀锌三价铬彩色钝化工艺的研究:http://www.youerw.com/huaxue/lunwen_9378.html