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本文研究采用氯化铵-氨羧络合物加入钛盐作为镀液,进行多次超高强度钢无氰镀镉钛工艺研究,中性盐雾试验法,缺口拉伸试验法来研究高强度钢无氰电镀镉钛工艺,确定无氰电镀镉钛溶液中各组成成分、电镀工艺参数及槽液控制范围,达到工艺应用要求,并在工业生产中广泛使用。 相似文献
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文章介绍了镀镍丝与电镀镍的生产工艺,详细分析了影响电镀镍工艺的诸因素,提出了电镀镍生产过程中故障排除的方法与举措,可供电镀业同类型生产厂家的工程技术人员参考和借鉴。 相似文献
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Urinary N-acetyl-beta-glucosaminidase as an indicator of renal dysfunction in electroplating workers
OBJECTIVES: To investigate chromium-induced renal dysfunction in electroplating workers. METHODS: A cross-sectional study was used to evaluate four biochemical markers of renal function. A total of 178 workers were divided into 3 comparable groups consisting of 34 hard-chrome plating workers, 98 nickel-chrome electroplating workers. and 46 aluminum anode-oxidation workers, who represented the reference group. Ambient and biological monitoring of urinary chromium were performed to measure exposure concentrations. RESULTS: Overall, urinary chromium concentrations were highest among hard-chrome plating workers (geometric mean 2.44 microg/g creatinine), followed by nickel-chrome electroplating workers (0.31 microg/g creatinine) and aluminum workers (0.09 microg/g creatinine). Airborne chromium concentrations were also highest in the hard-chrome plating area (geometric mean 4.20 microg/m3), followed by the nickel-chrome electroplating area (0.58 microg/m3) and the aluminum area (0.43 microg/m3). A positive correlation was found between urinary chromium and airborne concentrations (r=0.54, P < 0.01). Urinary concentrations of N-acetyl-beta-D-glucosaminidase (NAG) were also highest among hard-chrome plating workers (geometric mean 4.9 IU/g creatinine), followed by nickel-chrome workers (3.4 IU/g creatinine) and aluminum workers (2.9 IU/g creatinine). The prevalence of "elevated" NAG (>7 IU/g creatinine) was significantly highest among hard-chrome plating workers (23.5%), then among nickel-chrome workers (7.1%) and aluminum workers (8.7%). Differences in beta2-microglobulin, total protein, and microalbumin were not significant. CONCLUSION: The author's evidence indicates that NAG is an early indicator of renal dysfunction in hard-chrome plating workers. 相似文献
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Development of Continuous Coating and Plating Strip Steel 总被引:3,自引:0,他引:3
Coated and plated steel sheets,which charac-terized by high corrosion resistance,good shapingexcellent painting and decorating,are widely used inmany industries,such as building,automobile,light industry,and household appliances etc.Coatedand plated steel sheets contributes to improvingquality of products,extending their service life,sav-ing steels,reducing production costs and diminish-ing environmental pollution.With increasing of var-ious industrial products and improving of the quali-ty,re… 相似文献
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复合电镀是制造复合材料的一种新方法,在过去30多年里取得了极大的发展,关于电镀工艺和镀层性能的研究也较为深入.锌镍合金是近20多年发展起来的一种新型防护性镀层,具有极高的耐腐蚀性、低氢脆性、可焊性和机械加工性等优良特性,极具发展前景.锌镍合金镀层具有优良的耐腐蚀性,可以满足不断提高的防护性能要求.文章介绍了一种酸性锌镍合金电镀工艺.研究了电流密度的增加,镀层中的镍含量增加;获得了最佳工艺参数:100—120g/LNiSO4·H2O,60~80g/L ZnCl2,200~220g/LNH4Cl,20~35g/L硼酸,0.05~0.5g/L十二烷基硫酸钠,0.3g/L香草醛,pH=5,温度/.C=20—25,电流密度/(A/dm^2)=1. 相似文献
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铬镀层具有优异的机械和抗腐蚀性能,传统六价铬电镀存在高毒、高污染等问题,三价铬绿色电镀工艺受到普遍关注,但铬镀层不能持续增厚和镀液稳定性差是关键瓶颈.文中研究了脉冲电流和镀液流动对铬电沉积的影响规律,发现两者均可促进电镀过程中生成的副产物向镀液主体的传递.然而,脉冲电镀会降低铬电沉积效率,镀液流动可以提高铬电沉积效率,并能促进铬镀层的持续增厚.在50 mL/min的镀液流动条件下,直流电镀60 min,可获得41 μm的厚铬镀层,沉积速率为0.68 μm/min,镀层表面平整致密. 相似文献
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甲基磺酸(MSA)高速电镀锡是一种高效环保的镀锡工艺。该工艺技术成熟,已经广泛应用于美国等发达国家。中国近些年来在甲基磺酸(MSA)高速电镀锡领域进行了大量研究,梅钢、首钢等相继建立了甲基磺酸(MSA)高速电镀锡生产线。介绍了国内外甲基磺酸(MSA)高速电镀锡生产线的基本情况以及相关企业应用情况,提出离子交换膜电解法溶锡技术以及电磁辐射加热软熔技术具有良好的应用前景。 相似文献
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Ashutosh Sharma Sumit Bhattacharya Siddhartha Das Karabi Das 《Metallurgical and Materials Transactions A》2014,45(10):4610-4622
Pure Sn coatings are prepared by pulse current (PC) electrodeposition using aqueous acidic sulfate plating bath. The effects of various electroplating parameters such as current density, additive concentration, duty cycle, frequency, pH, bath temperature, and stirring rate (bath rotation) on the evolution of surface morphology of the coatings have been studied. The as-deposited coatings are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and surface profilometry. It is found that the current density, additive concentration, duty cycle, frequency, and pH have a major influence while temperature and stirring rate of the bath have a minor effect on the grain-size distribution. The mechanism involved in the morphology evolution and grain-size distribution due to the varying electroplating parameters has also been discussed. 相似文献
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Ni-P and Ni-P-La alloy coatings were prepared by electroplating. Electromagnetic shielding effectiveness under the different components of rare earth or the different operating conditions was tested by the network analyzer. The results show that electromagnetic shielding effectiveness of Ni-P-La alloy coating varies from 45 dB to 70 dB with the variety of the frequency from 10 MHz to 350 MHz. Corrosion of the salt fog impacts on the electromagnetic shielding effectiveness a little. A small amount of rare earth added to plating bath can not only enhance corrosion resistance of coating, but make electromagnetic shielding effectiveness increase by 1~5 dB. 相似文献
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与氰化物镀Cu-Sn合金及电镀Cu-Sn合金相比,化学法制备Cu-Sn包覆层具有环境污染小,能耗低的特点。在含有硫酸铜、氯化亚锡、硫酸、表面活性剂、络合剂及稳定剂等成分的溶液中,通过置换反应在铁粉表面包覆一层Cu-Sn合金,研究包覆层的形貌和主要成分以及添加剂的适宜浓度范围。结果表明,在含有15~20 g/L CuSO4.5H2O,35~40 g/L SnCl2.2H2O,22~30 g/L EDTANa2.2H2O,8 g/L聚乙二醇,2.5 g/L对苯二酚,0.3 mol/L H2SO4的溶液中,获得的(Cu-Sn)/Fe复合粉末表面为金黄色,包覆层厚约2μm,Sn的质量分数为7%~8%,Cu-Sn合金均匀连续地包覆在铁粉表面。 相似文献
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为优化碳纤维表面电镀镍的工艺条件,采用电镀法在碳纤维表面沉积一层纯镍层,通过正交试验法研究了不同工艺参数下碳纤维增重率的变化,探讨电流密度、电镀时间和镀液温度对镀层表面形貌和厚度的影响;并用冷热循环法测试不同厚度镀层与碳纤维之间的结合力.结果表明,采用电流密度0.56 A/dm2,电镀时间6 min,温度50℃时制备的镍镀层表面光洁、均匀致密,是较为理想的镀层. 相似文献
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对钢丝热镀Galfan合金镀层的耐蚀性和工艺设备适用性进行了综合论述,指出其耐蚀性的主要特点是腐蚀失重与时间的关系呈抛物线型、讨论了耐蚀性与成份,冷却速度和镀层组织的关系,分析了热镀Galfan合金中出现漏镀,镀层薄,表面质量差,工艺稳定性差的原因,指出了目前传统热镀锌生产线不经改造不能热镀Galfan合金的原因和解决的方法。 相似文献