碱性锌镍合金脉冲电镀工艺研究

采用脉冲电镀工艺,以碱性锌酸盐镀锌镍合金体系为基础镀液,制备了锌镍合金镀层,通过赫尔槽及正交实验研究了占空比γ、时间t、温度T、电流密度Dk对镀层的影响,得到了脉冲电镀锌镍合金镀层最佳工艺参数。     

氯化钾镀锌镍合金工艺的研究

利用分立阳极，分立电源的控制方法对氯化钾电镀锌镍合金工艺参数进行了正交优化和ＳＥＭ表面形貌观察，确定出含镍量在１０％－１５％的锌镍合金镀层的电镀工艺。     

电镀锌-铁合金的进一步研究

在焦磷酸盐体系电镀锌－铁合金的基础上，通过添加适量的稳定剂，获得了更加光亮、致密、耐腐蚀的锌－铁合金装饰镀层。通过正交试验，确定了最佳 镀液配方和工艺条件。实验结果表明，其耐蚀性和光亮度明显优于镀锌层。     

锌-铁合金层的磷化工艺

0前言 锌-铁合金镀层不仅防护性能优于普通镀锌与热浸镀锌层,而且还能提高对漆膜的结合力,具有良好的焊接加工性、抗蠕变性、易磷化性及抗蚀性。锌-铁合金镀层的磷化处理,能生成一种稳定的保护膜,提高涂层与基体镀层的结合力。     

电镀锌-镍合金工艺探讨

为实现轿车国产化,对轿车部分耐蚀零件提出了电镀锌－镍合金的要求。使用弱酸性锌－镍合金镀液后,能获得外观光亮、结合力良好、耐蚀性高的含镍量在１３％左右的锌－镍合金镀层,并对锌－镍合金镀液性能和镀层进行了测试,满足了第一汽车集团公司－大众公司锌－镍合金技术标准的要求。     

钢管电镀锌铁合金新工艺

建议钢管采用锌铁合金电底工艺，取代电镀锌可获得耐性能远优于镀锌的镀层。     

脉冲电镀锌-铁合金

介绍了在锌酸盐溶液中脉冲电镀锌-铁合金工艺。研究了镀液中氧化锌、亚铁离子和络合剂浓度、脉冲电流参数对镀层中铁含量的影响,获得了铁的质量分数为0.3%~0.6%的电镀锌-铁合金工艺,并通过中性盐水浸泡实验确定了最佳耐蚀镀层的工艺条件。     

机械镀锌-镍合金工艺的研究

在机械镀锌、锌-铝工艺的基础上,通过调整活化剂和促进剂的种类及用量,研制开发了机械镀锌-镍合金工艺.利用该工艺在钢基表面上得到了不同配比的锌-镍以及锌-铝-镍合金镀层.对这些镀层进行5%NaCl溶液喷雾加速腐蚀试验以及全浸加速腐蚀试验,并与机械镀锌层进行对比.结果表明,各种配比的锌-镍合金镀层的耐蚀性能皆好于机械镀锌层,并且随着镍含量的增加而提高;锌-铝-镍合金镀层的耐蚀性能比镀锌层提高7倍左右.     

连续电镀锌镍合金的研究

提出了一种高氯化铵弱酸型镀液体系连续电镀锌镍合金工艺，研究了m(Ni^2 )/[m(Ni^2 ) m(Zn^2 )]、氯化铵浓度，电流密度、温度、PH值对镀层镍含量的影响，推导出连续镀的镀速计算公式，采用此工艺可获得外观良好、镍含量在13％－15％的锌镍合金镀层。     

机械研磨电镀锌-铁合金镀层及其耐蚀性的研究

在电镀锌-铁合金镀层的过程中施加机械研磨作用,制得机械研磨电镀锌-铁合金镀层。采用扫描电子显微镜观察了镀层的微观形貌,并采用电化学试验研究了镀层在3.5%的NaCl溶液中的腐蚀行为。结果表明:与普通锌-铁合金镀层相比,机械研磨电镀锌-铁合金镀层的组织结构致密,晶粒达到了纳米晶尺寸,耐蚀性更好。     

汽车零部件锌铁合金滚镀工艺

为适应国家有关淘汰含氰电镀的规定,提出以氯化物锌铁合金电镀工艺替代含氰电镀：某厂汽车零部件滚镀自动线采用锌铁舍金新工艺取代了原氰化滚镀锌工艺：介绍了锌铁合金滚镀工艺及各工序配方,探讨了滚镀液各组分、pH值、阴极电流密度对锌铁合金镀层的影响比较了锌铁舍金滚镀工艺与原氰化工艺的实践应用,表明锌铁舍金滚镀工艺镀层防护性能优、耗电少、生产效率高、成本低,已成功应用于汽车零部件的滚镀自动线。     

铜电极上Zn－Ni－P合金电沉积行为的研究

采用循环伏安法研究了铜电极上Ｚｎ－Ｎｉ－Ｐ合金电沉积行为。结果表明：在Ｚｎ－Ｎｉ合金锭液中加入ＮａＨ２ＰＯ２，Ｚｎ－Ｎｉ－Ｐ电沉积的阴极极化减小，对合金电沉积起活化作用，有利于Ｚｎ－Ｎｉ－Ｐ合金镀层的形成。所获得的Ｚｎ－Ｎｉ－Ｐ合金层与Ｚｎ层、Ｚｎ－Ｎｉ合金层相比阳极溶解峰电位正移，使含磷的锌基合金的耐蚀性大大提高。     

Optimization of the hydrogen evolution activity on zinc-nickel deposits using experimental strategies

The experimental strategies including the fractional factorial design (FFD), path of the steepest ascent study, and the central composite design (CCD) coupled with the response surface methodology (RSM) was adopted to optimize the hydrogen evolution activity of Zn-Ni deposits. The key deposition variables, pH, the Zn/Ni ionic ratio and the TEPA concentration in the plating solutions, influencing the hydrogen evolution activity of Zn-Ni cathodes were found in the FFD investigation. These variables were subjected to the steepest ascent study to approach the vicinity of the optimal deposition conditions for plating the Zn-Ni deposits with the highest hydrogen evolution activity. In the CCD investigation, the optimal deposition settings, where the temperature of 50 °C, the current density of 2500 A m⁻², pH of 13.0, the Zn/Ni ionic ratio of 0.89 and the TEPA concentration of 0.58 M, were obtained by means of a regression model. This highest activity of the Zn-Ni deposits mainly consisting of the γ phase structure for hydrogen evolution is due to a combination of their good electrocatalytic activity and relatively high surface area. The electrocatalytic activity of these cathodes mainly composed of the γ phase Zn-Ni alloy was damaged by the selective dissolution of Zn from the deposits in 5 M KOH.     

电镀锌铁合金工艺

概述了电镀锌铁合金工艺硫酸盐体系、锌酸盐体系、氯化物体系等不同类型镀液及其添加剂 ,如络合剂、表面活性剂、光亮剂和晶粒细化剂。探讨了金属浓度比、pH值、电流密度、温度、脉冲电流对镀层中铁含量的影响 ,并对电镀锌铁合金镀液和镀层性能进行了分析     

碱性锌-镍合金镀液及镀层中锌、镍的测定

酸性锌-镍合金镀液中锌、镍的测定方法报道很多，而碱性镀液中锌、镍的测定报道很少。采用过硫酸铵作氧化剂，在碱性介质中，镍与丁二酮肟生成红色络合物借此比色，求出镍含量；用EDTA滴定法确定锌、镍总量，然后减去镍量从中得到锌含量。此方法也可用于镀层中的锌及镍测定。本方法测定结果准确、快速，能满足实际生产的要求。     

Studies of phase composition of Zn-Ni alloy obtained in acetate-chloride electrolyte by using XRD and potentiodynamic stripping

The phase composition of Zn-Ni alloy electrodeposited in acetate-chloride electrolyte has been studied as a function of ZnCl₂ concentration and cathodic current density (i_c) by the potentiodynamic stripping and XRD methods. It appeared to be dependent only on the Zn/Ni ratio in the alloy, irrespective of whether the result was attained by varying the cathodic current density or by changing the [Zn²⁺]/[Ni²⁺] ratio in electrolyte. A Zn-Ni alloy dissolving in the potential range of i_a peak D can be obtained by the method of cyclic voltammetry. This phase is a compact black coating. It has been determined by potentiodynamic stripping that pure Ni oxidizes only in the range of positive potentials, while Zn-Ni alloy containing some quantity of Zn oxidizes in the range of negative potentials. It was determined that the preciser data of potentiodynamic stripping were obtained in electrolyte containing Cl⁻ ions. Zn-Ni alloy can be chromated only in the case when the η-phase makes up a sufficiently large portion of Zn-Ni alloy.     

Zn-Fe合金镀层黑色钝化工艺研究Ⅱ--工艺条件的优化及钝化膜耐蚀性能的研究

在钝化膜组成成分研究的基础上，详细研究了工艺条件对Zn-Fe合金钝化膜耐蚀性的影响，从而得到了最佳的工艺条件。对Zn-Fe合金钝化膜性能进行了测试，并采用5％NaCl中性溶液浸泡试验对Zn镀层、Zn-Fe合金镀层及Zn-Fe-TiO2复合镀层黑色钝化膜的耐蚀性进行了比较。结果表明，经黑色钝化后，Zn-Fe合金镀层及Zn-Fe-TiO2复合镀层的耐蚀性都有很大的提高；Zn-Fe合金镀层的耐蚀性是纯锌镀层的3倍多，而Zn-Fe-TiO2复合镀层的耐蚀性是Zn-Fe合金镀层的2倍多，是纯锌镀层的5倍左右。     

清洁生产型锌铁合金电镀工艺

本文综合十多年发表的系列文章,介绍了锌铁合金电镀工艺、水处理、镀液性能和镀层性能。多年的生产实践表明其具有良好的发展前景。     

Physico-chemical properties of Zn-Fe alloy deposits from an alkaline sulphate bath containing triethanolamine

The composition, properties, structure and morphology of Zn-Fe alloy deposits obtained from an alkaline sulphate bath have been investigated. The bath containing triethanolamine produced smooth, uniform and bright Zn-Fe alloy deposits having the desired 15–25% Fe. The deposition potentials of Zn-Fe alloy lie between the potentials of the individual metals. Increased current density lowered the Fe percentage in the alloy deposit. The structure and morphology of the alloy deposits were found to depend on the Fe percentage in the alloy.