Zn-Fe-P合金镀层中磷、铁含量影响因素的研究

采用自制的析磷助剂ＥＡ－Ｐ作为Ｚｎ－Ｆｅ－Ｐ合金镀层中的磷源,研究了Ｚｎ－Ｆｅ－Ｐ合金镀液组成及工艺条件对镀层中磷、铁含量的影响。在最佳工艺条件下,可得到磷、铁含量分另为０．６％左右和０．４％Ｚｎ－Ｆｅ－Ｐ合金镀层。腐蚀试验证明,经银白色钝化后的Ｚｎ－Ｆｅ－Ｐ合金镀层的耐蚀性能是Ｚｎ－Ｆｅ合金镀层的２倍以上。     

含磷的锌基合金的研究现状

简要评述了含磷的锌基合金的研究现状。介绍了Ｚｎ－Ｐ合金镀液中配体和光亮剂的选择、Ｚｎ－Ｐ合金度层中引入第二种金属可以提高镀层中磷含量，同时讨论了Ｚｎ－Ｐ镀层、ＺＺｎ－Ｆｅ－Ｐ镀层的耐蚀性。     

无氰碱性Zn－Fe合金电镀工艺研究

研究了碱性锌酸盐体系电镀Ｚｎ－Ｆｅ合金工艺，确定了含铁量为０．０５％～１％的Ｚｎ－Ｆｅ合金镀层工艺，并研究了Ｚｎ－Ｆｅ合金镀层的黑色钝化工艺。镀层经钝化处理，耐蚀性大大提高。     

碱性溶液电沉积Zn—Fe合金性能研究

在碱性锌酸盐溶液中添加少量三价铁获得高稳定性电解液和电沉积高耐蚀性的Ｚｎ－Ｆｅ合金镀层。研究了镀液及镀层的主要工艺性能。     

分光光度法测定Zn—Fe—P合金中的磷

采用磷钒钼黄分光光度法测定Ｚｎ－Ｆｅ－Ｐ合金镀层中的五价磷和低价磷含量。镀层中Ｐ＾５＋加标回收率９０％－１０５％之间，表明该方法准确可靠。     

分光光度法测定Zn—Fe—P合金镀层中的铁

本文首次采用分光光度法测定了Ｚｎ－Ｆｅ－Ｐ合金镀层中的铁的含量。镀导台Ｆｅ＾３＋的加标回收率处于９０￣１０５％之间。结果表明该方法准确可靠。     

电沉积Ni-Fe-P非晶态合金镀层变温晶化的研究

用差热分析的方法研究了电沉积Ｎｉ－Ｆｅ－Ｐ非晶态合金镀层的变温晶化过程。通过实验得出不同铁含量的Ｎｉ－Ｆｅ－Ｐ合金在不同加热速度下的开始晶化温度、结束晶化温度,并计算出其晶化激活能。对不同Ｆｅ含量镀层的晶化激活能进行比较发现,Ｆｅ元素在Ｎｉ－Ｆｅ－Ｐ合金镀层中具有稳定非晶态组织的作用。     

电沉积Ni—Fe—P非晶态合金镀层高温晶化的研究

用差热分析的方法研究了电沉积Ｎｉ－Ｆｅ－Ｐ非晶合金镀层的变温晶化过程。通过实验得出不同铁含量的Ｎｉ－Ｆｅ－Ｐ合金在不同加热速度下的开始晶化温度、结束晶经温度并计算出共晶化激活能。对不同Ｆｅ含量镀层的晶化激活能进行比较发现，Ｆｅ元素在Ｎｉ－Ｆｅ－Ｐ合金镀层具有稳定非晶态组织的作用。     

电镀Zn-Fe合金的发展现状

综述了Ｚｎ－Ｆｅ合金电镀的发展现状,阐述了Ｚｎ－Ｆｅ合金的电沉积机理、镀层结构及其抗蚀机理,指出了Ｚｎ－Ｆｅ合金电镀的发展方向。     

电镀Zn—Fe合金的发展现状

综述了Ｚｎ－Ｆｅ合金电镀的发展现状，阐述了Ｚｎ－Ｆｅ合金的电沉积机理，镀层结构及其抗蚀机理，指出了Ｚｎ－Ｆｅ合金电镀的发展方向。     

分光光度法测定锌-铁-磷合金镀层中的铁

采用分光光度法测量了锌－铁－磷合金镀层中的铁含量。阐述了该方法的原理分析了影响测量结果的各因素,并对铁进行了回收试验,铁的加嘏率达９０％以上。表明该方法准确可靠。     

Visualisation of the local electrochemical activity of thermal sprayed anti-corrosion coatings using scanning electrochemical microscopy

Scanning electrochemical microscopy was used to study the electrochemical activity of anti-corrosion coatings formed from Inconel 625, a Ni-Cr-Mo alloy commonly used in engineering applications. The coatings were formed using a high velocity oxygen fuel thermal spraying technique. Upon spraying the alloy onto mild steel substrates, clear splat boundaries were formed at the interface between adjacent droplets as they cooled on the substrate surface. Scanning electrochemical microscopy in the feedback mode, employing ferrocenemethanol as redox mediator, was used to study the local electrochemical activity of samples of the wrought alloy, the sintered alloy and the thermal sprayed coating. The wrought and sintered materials showed responses typical of that expected for a purely insulating material. However, SECM approach curve data showed that the electrochemical activity of the thermal sprayed material was higher than that of the bulk alloy. Local variations in the coating's electrochemical activity were then visualised using SECM imaging, which appear to be related to the splat boundaries formed during the thermal spray process.     

预处理对AZ91D镁合金化学镀镍的影响

以磷酸盐-氟盐-高锰酸盐配制镁合金的活化溶液,实现了镁合金表面直接沉积镍-磷合金镀层。采用扫描电子显微镜、能谱仪和X-射线衍射仪研究了镁合金活化后的形貌和成分。结果表明,活化转化膜层致密,主要成分为MgF_2-Mg_3(PO_4)_2复合结构。极化曲线和结合力测试表明,转化膜可有效地防止镀液对镁基体的腐蚀,所得镍-磷合金镀层致密,具有良好耐蚀性能,且镀层和镁基体间的结合力良好。     

Spark production by abrasion of titanium alloys in golf club heads

The objective of the present study was to determine whether golf clubs that have titanium (Ti) alloy surfaces can produce sparks when abraded under normal swing conditions. In the present work, sparks are defined as moving particles that emit radiant energy due to the process of combustion on its surface. Two three‐irons and a three‐wood containing a Ti alloy in the head as well as two three‐irons and a three‐wood that only contain stainless steel in the head were included in the study. The impact events during abrasion testing were recorded using a high‐speed video camera, and abrasion damage was determined using stereometric analysis of scanning electron microscopy images. The findings reveal that Ti alloy faceplates that extend to the sole of the club can produce a number of Ti alloy particles when abraded under swing conditions. The particles then combust for a sufficient duration to potentially ignite a neighboring fuel source such as dry foliage and grasses. Abraded Ti alloy microparticles up to 500 µm in diameter were observed to burn for nearly 1 s, allowing ample time for fuel ignition. By contrast, no sparks were produced by stainless steel club heads when tested under the same conditions. Copyright © 2014 John Wiley & Sons, Ltd.     

聚合物/锡锌合金复合材料的密炼混合行为

研究了Sn Zn合金组成、含量、密炼工艺、以及聚合物基体对制备Sn Zn合金/聚合物复合材料过程中金属析出量的影响。结果表明,当Sn Zn合金组成一定时,合金添加量较低时,合金析出量为零,当合金添加量较高时,合金析出量随Sn Zn合金添加量增大而增大;增加Sn Zn合金中Zn含量,可减弱金属析出;与纯锡相比,Sn Zn合金与高密度聚乙烯（PE HD）有更强的复合能力;升高加工温度与降低Sn Zn合金中Zn的比例对于抑制金属析出具有等效性;合金析出量随密炼转速增大而增加,但转速增大会减小合金粒径分布;Zn质量分数为30 wt%的合金与PE HD密炼的最佳时间为35 min;提高聚合物极性,可减弱聚合物与Sn Zn合金复合时发生的金属析出。     

利用回收PET改性PC及其合金的研究

用已扩链增黏的回收聚对苯二甲酸乙二醇酯(PETr)及改性聚碳酸酯(PC),并通过熔融反应挤出制备了PC/PETr合金,采用相容剂乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯(E-MA-GMA)对PC/PETr合金进行增容。研究了相容剂用量对该合金拉伸强度、冲击强度和形态结构等的影响。结果表明,当m(PC)/m(PETr)为60:40,相容剂E-MA-GMA的质量分数为7.5%时,合金发生脆韧转变,缺口冲击强度达到58.76kJ/m2,同时拉伸强度达到49.96MPa。SEM观察发现,E-MA-GMA作为反应性增容剂,使得分散相PET颗粒变细。并且,随着E-MA-GMA用量的增加,PET在PC/PETr/E-MA-GMA共混体系中呈现出极不规则的近似条状或片状的形态结构,共混体系呈现出双连续相     

电镀锌及锌合金发展现状

综述了近年来锌电镀、锌舍金电镀、锌基复合电镀、锌合金基复合电镀的研究与应用现状，并对纳米技术在锌及锌合金电镀中的应用提出了展望。     

甲磺酸盐电镀Pb-Sn合金工艺研究

研究了甲磺酸电镀Pb-Sn合金的电解液组成,讨论了主盐、游离酸、稳定剂的质量浓度以及阴极电流密度对Pb-Sn合金镀层中Sn含量的影响。采用Hull槽试验方法确定了甲磺酸电沉积Pb-Sn合金镀层的阴极电流密度范围。根据研究结果确定了甲磺酸体系电镀Pb-Sn合金润滑镀层的工艺规范。     

The effects of Cu and Al on dry sliding wear properties of eutectic Sn-9Zn lead-free solder alloy

The present study investigates the influence of Cu and Al on microstructure and wear behavior of a eutectic Sn-9Zn solder alloy. The Sn-9Zn–X alloy was produced by adding various amounts of Cu and Al through investment casting method. The produced Sn-9Zn–X alloys were characterized by a scanning electron microscope, X-ray diffraction, and hardness measurements. In wear tests at 1 ms^?1 sliding speed, 10 N load and 5 different sliding distances (400–2000 m) were used. The results show that as the amount of Cu and Al increased within Sn-9Zn alloy, the hardness of the alloy increased as well. Depending on the increase in hardness of the alloys produced by investment casting, it was observed that weight loss decreased during wear tests. Furthermore, the same proportion of added Al alloys’ hardness and weight loss were observed to be higher than the added Cu alloys. Furthermore, the Cu-added alloy exhibited higher hardness and lower weight loss than the Al-added alloy did.     

铁-钨合金电镀工艺的研究

六价铬电镀具有毒性大、环境污染严重等缺点。为研制出一种合适的代铬镀导致 ，提出了一种铁－钨合金电镀工艺。研究了镀液中铁离子浓度、添加剂、电流密度、pH值和温度等因素对所得合金镀层钨含量和质量的影响。所得镀层外观与铬镀层相近，具有良好的耐蚀、耐热和耐磨性能。