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CS型多稀土镀铬添加剂及其应用工艺的研究 总被引:2,自引:0,他引:2
1 前言自从Sargent及Fink等人于1923年研究成功工业性的高浓度铬酸液镀铬工艺以来,镀铬已成为国内外湿法电镀中最重要的电镀工艺之一,应用广泛。但这种高浓度镀铬工艺存在着电流效率很低,深镀能力差,能耗高、生产成本大、铬酸带出多,环境污染严重,对职工身体危害大等弊病,如:1988年常熟市电镀车间中铬雾最高超标189倍, 相似文献
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络合萃取法处理高浓度有机废水 总被引:18,自引:1,他引:18
介绍了高浓度有机废水的来源和处理现状。提出了高浓度有机废水的络合萃取处理方法的研究方向。阐述了络合萃取法处理高浓度有机废水的高效性 相似文献
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在监测电镀铬废水中的Cr(Ⅵ)时,系统多采用接触式检测,监测点数量多,监测准确率低,危险性强。提出基于无线传感网络(Zigbee)技术的电镀铬废水中Cr(Ⅵ)的网络远程监测系统,通过采样对电镀废水中Cr(Ⅵ)含量和内梅罗指数进行检测和分析,依据检测的结果,进行信号转换,增加Zigbee网络节点并获取节点分配地址之间的偏移量,将数据帧转发给其终端子节点,采集到的数据信息经过Zigbee网络进行汇总及处理,实现对镀铬废水中Cr(Ⅵ)的网络远程监测。测试试验证明了该系统在网络远程监测Cr(Ⅵ)的有效性。 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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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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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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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