硫酸铈对Ni-B合金化学镀的影响

研究了硫酸铈对化学镀Ni-B合金的影响,通过实验测定得出,镀液中添加一定量的硫酸铈能提高沉积速度和改善Ni-B镀层的耐蚀性能.XRD结果表明,由于硫酸铈的加入,在B含量较低的情况下,获得了非晶态的Ni-B合金镀层.     

Zn-Al-Mg系热浸镀层钢板的研究进展

介绍了Zn-Al-Mg系合金镀层的发展及日本2家企业开发的2种高耐蚀性合金镀层钢板的性能,分析了添加合金元素对镀层组织的影响以及微观结构对镀层性能的影响,总结出合金镀层具有高耐蚀性的机理,指出了Zn-Al-Mg系高耐蚀热浸镀合金镀层的研究方向。     

添加微量元素对结构件热镀用J28合金性能优化的试验研究

介绍了添加Ni、Mg、RE等合金元素对结构件热镀用J28合金性能的影响.在合金中添加微量元素,可使合金的塑性增强、耐蚀性提高、流动性改善,合金镀层的耐蚀性、力学性能以及镀层表面质量得到改善.     

工艺设备对钢丝Galfan镀层性能及质量的影响

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。     

钕铁硼永磁体电镀Ni-P非晶态合金镀层

研究了钕铁硼永磁体电镀Ni-P非晶态合金镀液组成、工艺参数和工艺流程,分析了影响镀层性能的影响因素,包括电流密度、温度、镀液的pH值及亚磷酸的含量等。测定了镀层与基体的结合强度;用中性盐雾试验评定了镀层的耐蚀性。结果表明,Ni-P非晶态合金化学稳定性好,耐蚀性优异,是钕铁硼永磁体的一种理想保护镀层。     

电沉积锌-铝合金的工艺及性能研究

在综述国内外对电镀锌及锌合金镀层工艺与耐蚀性研究现状的基础上，提出了在碱性溶液中通过添加特殊络合剂，实现锌-铝合金共沉积。分析测试表明，在锌-铝合金镀层中，铝的含量为0.169～0．438wt％之间。在氯化钠溶液和人工海水中的耐蚀性是纯锌镀层的3～4倍。作为防腐性镀层材料，Zn-Al合金镀层可以替代镉镀层、锌-镍以及锌-钴等合金镀层。     

热浸镀锌钢板镀层织构与耐蚀性

用X射线衍射和动电位扫描方法研究了热浸镀锌钢板镀层织构、相分布和耐蚀性的关系.实验结果表明,镀锌层中纯锌相的主要织构组分为{0002}基面织构,当镀锌层厚度增加时,纯锌相中{0002}基面织构密度水平增加,纯锌相自腐蚀电位升高、腐蚀电流密度减小以及耐蚀性增加.X射线衍射分析电化学剥离后的铁锌相,结果表明,镀锌层由纯锌相和合金相组成;电化学实验表明,镀锌层各相耐蚀性不同,合金相的耐蚀性高于纯锌相的耐蚀性,且Fe--Zn合金相的耐蚀性随铁含量的增加而增加.     

温度对镍钨合金镀层电镀质量的影响

Ni-W合金镀层具有优良的耐蚀性、耐热性和耐磨性,良好的Ni-w合金镀层可以用以取代硬铬镀层从而减少对环境的污染.应用电子探针和x射线衍射(XRD)等现代材料测试方法研究了镀层的组成和组织结构,分析了镀液温度对镀层组成的影响以及镀层中钨含量对镀层组织结构的影响.     

化学镀Ni-P合金工艺及镀层耐蚀性的研究

介绍了一种高稳定性的化学镀Ni-P合金工艺，讨论了各种成分和工艺条件对Ni-P合金镀层中加，的影响，介绍了镀层耐蚀性的测定结果。     

变电站设备用铝合金在模拟沿海工业大气环境中的腐蚀行为研究

研究了变电站设备用Al-Mg合金、Al-Mg-Mn合金、Al-Cu-Mg-Mn合金及镀Ag铝合金材料在模拟沿海工业大气环境中的腐蚀行为,采用失重法、SEM、EDS和电化学分析等方法对合金的腐蚀行为进行了分析。研究结果表明,实验合金在腐蚀初期以点蚀为主;腐蚀产物的堆积会不同程度地减缓合金腐蚀过程。Al-Mg合金的耐蚀性能最好,Al-Cu-Mg-Mn合金的耐蚀性能最差,镀Ag处理Al-Cu-Mg-Mn合金的腐蚀速率显著下降,耐蚀性大幅提高。Ag镀层相对Al基体属阴极性镀层,当镀层因腐蚀产生破损后会使合金的腐蚀速率迅速增加。     

化学镀Ni-B合金的工艺条件研究

研究了镀液成分和工艺条件对Ni—B合金沉积速度的影响，确定了合适的化学镀N—B合金的工艺条件，按此条件获得了含硼量为4．508％的非晶态Ni—B合金层，并具有较好的耐蚀性。     

Preparation of Pulse Electrodeposited Ni-B Coating with RSM Software and Evaluation of Its Microhardness and Electrochemical Behavior

Metallurgical and Materials Transactions A - In this study, the electrodeposition parameters were optimized to attain Ni-B alloy coatings with high hardness and corrosion resistance. The optimum...     

Preparation,Characterization and Mechanical Properties of Cu-Sn Alloy/Graphite Composites

Ni-B coating was prepared on the surface of graphite particles using the electroless plating method. The Ni-B coating was composed of spherical grains with average diameter of 80 nm. The phases of Ni-B coating were indexed as nanosized crystal Ni phase and amorphous Ni-B phase. Cu-Sn alloy/graphite composites with 0.5, 1.0, 1.5, and 2.0 wt pct graphite contents were synthesized by the powder metallurgy method. Ni-B coating improved the wettability and bonding strength between the Cu-Sn alloy and graphite. The composite with Ni-B coated graphite exhibited higher density, hardness, and compression strength compared with the composites with bare graphite. The crack propagation mechanism of the composites was also analyzed.     

BaTiO3陶瓷表面金属化的研究

在BaTiO     

Preparation and Corrosion Resistance of Rare Earth Conversion Coatings on AZ91 Magnesium Alloy

Magnesiumalloysarewidelyusedinweaponin dustry,spacenavigationandhavegoodpotentialof applicationanddevelopmentindailycommunication facilitiesduetotheirpropertiesoflightweightandhighstrength[1].Appliedasstructuralmaterials,mag nesiumalloysmayeasilycrackduet…     

机械镀Zn-2%RE-Al复合镀层的性能

采用机械镀工艺制备了Zn-2%RE-Al复合镀层。利用金相显微镜、扫描电子显微镜观察分析Zn-2%RE-Al复合镀层的表面形貌和断口形貌,并对其孔隙率、致密度、结合强度及耐腐蚀性能等进行检测,分析添加铝粉对镀层综合性能的影响。研究结果表明：铝能够改善镀层的耐蚀性能,提高镀层的致密性;镀层耐蚀性随铝添加量增加呈降低趋势;当铝加入量为1%时,Zn-2%RE-Al镀层耐蚀性最好,致密性最高,是1种综合性能较好的防护性镀层。     

螺栓热浸镀Zn-Ni合金工艺

在实验中 ,对不同的助镀剂成分 ,热浸镀工艺及镀后钝化处理进行了研究 ,得出含 0 .1 % Ni的锌合金镀层具有较高的耐磨、耐蚀性能 .黑色低铬盐钝化工艺可降低环境污染 ,提高镀层耐蚀性     

Influence of silicon coating on the corrosion resistance of Zn-Al-Mg-RE-Si alloy

The electric arc spraying method was used to prepare the Zn-Al-Mg-RE-Si alloy coating with different content of silicon.The corrosion resisting property was measured by copper accelerated salt spray(CASS) and corrosion weightless test.The influence of silicon content on the corrosion resisting property was investigated by XRD,SEM,polarization curve and electrochemical impedance spectroscopy(EIS) and the electrochemical property of coating in the corrosion process was analyzed.The results showed that the density of coating was improved significantly since the major nonequilibrium glass-like state phase was composed of silicon and other metals existed in the Zn-Al-Mg-RE-Si alloy coating,which prevented the corrosive medium and retarded the corrosion velocity because of compact corrosion products in the corrosion embryo.The Zn-Al-Mg-RE-Si coating had better corrosion resistance than the Zn-Al-Mg-RE because of more positive potential,half corrosion current density and double electrochemical reaction resistance.     

Improving the Corrosion Resistance of the Nickel–Tungsten Alloy by Optimization of the Electroplating Conditions

Nickel–tungsten (Ni–W) alloy coating was electrodeposited on the copper substrate by direct current voltammetry. The optimization of a free-ammonium bath for electrodeposition of Ni–W alloy coating was investigated. Experiments were focused on elucidating the effect of W concentration and operating conditions on the corrosion performance of the obtained Ni–W alloy coating. The corrosion behavior of the coatings was investigated by potentiodynamic polarization (Tafel) test. Experimental data such as corrosion current density, corrosion rate and polarization resistance indicated that the operating conditions used during the electroplating had significant effects on the corrosion parameters of the Ni–W alloy coating. The results showed that the highest corrosion resistance was obtained for the coating with 56.7 wt% tungsten (Ni/W ratio of 1:2.5) which was prepared at the current density of 3.8 A dm^?2. The increase in the corrosion resistance at the optimum current density was attributed to the lower interferences of the hydrogen evolution reaction. Energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM) and X-ray powder diffraction (XRD) techniques were used to characterize the electrodeposited Ni–W alloy with the best anti-corrosion parameters.