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室温电镀装饰铬的研究 总被引:2,自引:0,他引:2
本研究通过大量实验,合成了一种电镀装饰铬的添加剂DCA-1。在镀铬电解液中加入5~7g/L DCA-1添加剂后,可以在CrO_3含量为150~200g/L,操作温度为25~30℃条件下得到镜面光泽的镀层。与标准镀铬电解液相比,该电解液具有较高的阴极电流效率(当D_k=20A/dm~2时,比标准镀铬的阴极电流效率提高了51%);分散能力比标准镀铬电解液提高了73%;深镀能力比标准镀铬电解液提高了2.8倍。镀层性能测试结果表明,该镀层具有较高的硬度,较好的耐磨性,镀层光泽度高、内应力低,镀层厚度在2μm以下时没出现裂纹。综上所述,以DCA-1为添加剂的电镀装饰铬具有以下特点:(1)电解液的CrO_3浓度较低、操作温度低,这不仅降低了生产成本,而且减轻了Cr~(6+)对环境的污染。(2)电解液的阴极电流效率较高,有较好的分散能力和极好的深镀能力,适于镀复形状较复杂的零件。(3)镀层光泽度高、内应力低、耐磨性好,适于作防护装-饰性镀层的表层。 相似文献
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BTL-1光亮、高效、无低电流腐蚀工艺是一种新型通用镀铬工艺.它可在较低的CrO_3浓度(120~150g/1)、无氟催化剂的条件下使用.该工艺电流效率高,沉积速度快,镀层光亮、硬度高且有微裂纹.该工艺无低电流密度腐蚀,有优良的覆盖能力和分散能力,既可用于装饰性镀铬,也可用于镀硬铬.本文主要报告镀液主要成份及主要工艺条件对电流效率、光亮电流密度范围的影响,还分别用扫描电镜、显微硬度计测定了镀层的微裂纹密度和显微硬度等性能. 相似文献
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制定了硫酸盐三价铬电镀铬新工艺并测试了镀液和镀层的性能。该工艺镀液稳定,沉积速度为0.057~0.077μm/min,镀层质量优良。中性盐雾试验,恒定湿热试验,人造汗液测试及抗化学污染测试均满足标准要求。镀层色泽美观,δ能够达到0.3μm以上。比较了硫酸盐和氯化物三价铬电镀的特点,采用硫酸盐镀铬,镀层耐腐蚀性好,原材料消耗成本低。 相似文献
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传统的镀铬工艺,由于其本身的特点,在电镀大型工件和形状复杂零件时,镀层容易产生缺陷,成品率不高.通过对较大零件内孔镀硬铬的工艺过程及产生的缺陷进行考察,分析了产生缺陷的可能原因,提出了避免硬铬镀层产生缺陷的解决措施.实施结果证明:产生原因分析正确,所提改进措施科学合理,实施后硬铬镀层质量有较大的提高. 相似文献
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针对小型镀铬生产线电气控制系统存在的缺陷,对其进行改造。选用数字化控制器提升自动化程度和控制精度,并利用总线技术简化布线,并应用基于总线技术的通讯协议实现集中管理。 相似文献
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对钨含量大于95%,镍含量大于3%的钨镍铁合金镀硬铬进行了试验研究,确定了合适的工艺配方和参数。所得铬镀层均匀、细致、无明显缺陷;对镀铬层热震试验,加热至230℃保温2h后投入20℃的水中,镀层无起泡、无脱落;96h中性盐雾试验后无腐蚀出现。实验表明:钨镍合金镀硬铬后能增加耐蚀性和耐磨性。 相似文献
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Ana Paula Kurek Taise Ranzan Isabel Narloch Cardoso Marta Elisa Rosso Dotto Palova Santos Balzer Noeli Sellin 《应用聚合物科学杂志》2020,137(7):48372
Chrome-plated acrylonitrile–butadiene–styrene ( ABS) parts with defects in the metal layer were submitted to pickling with hydrochloric and nitric acids and recycled by injection in different proportions with neat ABS. For comparison, samples with neat ABS (ABSn) and ABS submitted to pickling (ABSp) were also injected. The influence of the pickled material on the samples properties was evaluated by chemical, thermal, and mechanical analysis. The injected samples were chrome by conventional process and evaluated by visual inspection, adhesion test, resistance to corrosion, and accelerated aging test, to evaluate the quality of the chrome finish. A gradual darkening of samples and formation of carbonyl groups with the increase in the pickled ABS concentration and little influence on the melt flow index were observed. The samples exhibited one thermal degradation stage similar to ABSn. The increase in the pickled ABS percentage caused a slight increase in glass-transition temperature of polybutadiene phase, and did not influence the tensile properties and hardness of samples, but decreased the impact resistance. After chrome plating, all samples were approved for visual inspection and metal layer adhesion test. Only the sample injected with pickled ABS was reproved in corrosion test, due to the oxidation of the chrome layer. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48372. 相似文献