电沉积钼合金及其电催化性能

通过正交实验得到La-Co-Mo合金电沉积的最佳工艺条件。以DSA为阳极分别在钛基体上电沉积La-Mo、Co-Mo、La-Co-Mo合金,采用AES、电子测厚仪、显微硬度计、划痕实验、盐雾实验等手段对镀层性能进行测试。所得钼合金镀层致密、结合力强、耐高温腐蚀性能好。极化曲线测定结果显示,钛基体电沉积La-Mo、Co-M0、La-Co-Mo合金层析氢过电势比钛电极低,电催化性能高。钛基体电沉积钼合金层可望作为新型氯碱工业用高活性阴极。     

钛钼合金的应用调查

<正> 近年来,研制成钛钼合金的各种异型件,如2KB_6叶轮及球阀阀芯,其中φ40 mm 及80mm,以氯化聚醚为外壳,钛钼合金为阀芯的球阀,在上海新华香料厂满意地已使用了两年余,另外在香油分馏塔中,以车屑作为分馏填料的耐蚀材质试验和已使用四年余的钛钼合金液下滴加管等的使用情况,初步证明该合金在还原性介质中,均具有较为优良的耐腐蚀性能。在反应温度为90℃、浓度为63～70%的硫酸和温度为50～     

电沉积Ni-Mo-P合金及其析氢电催化性能的研究

在大量文献的基础上,采用正交试验优化电沉积Ni-Mo-P合金工艺.经过测试证明:Ni-Mo-P合金镀层致密,结合力强,具有较高的硬度和耐高温腐蚀的性能.通过极化曲线的测定,钛基Ni-Mo-P合金具有比钛电极和铁电极更低的析氢过电势,Ni-Mo-P合金具有较高的电催化性能,可望成为新一代氯碱工业用高活性阴极.     

钛镍钼合金在某些介质中的耐蚀性能

本文对钛镍钼合金在甲、乙酸混合液和烃类氯衍生物介质中进行了耐蚀试验,结果表明:钛镍钼合金抗蚀率比纯钛高2～3个数量级。     

复合电沉积镍钼合金的Taguchi设计

镍钼合金镀层用于电极表面处理能提高其析氢催化性能。采用Ｔａｇｕｃｈｉ试验设计镍钼合金电镀工艺。阐述了Ｔａｇｕｃｈｉ设计方法的原理,通过正交试验优出一种镍钼合金电镀的最佳工艺,大大降低了镍钼合金镀层的析氢性能。     

耐混酸用铸造铁镍基合金的腐蚀行为

设计了耐混酸用的新型铸造铁镍基合金的化学成分,采用金相显微镜、X 射线衍射和电子探针观察与分析了合金的金相组织,并研究了该合金的均匀腐蚀、晶间腐蚀与点腐蚀行为。试验结果表明,低的含碳量和适量的镍、铬、钼、铜、钨的复合作用,使该合金对混酸介质具有良好的耐蚀性和较高的抗晶间腐蚀与抗点蚀性能。     

电沉积Co-Mo合金薄膜的结构和热稳定性

通过电沉积,在铜基体上制备了Co-Mo合金薄膜.讨论了薄膜组成与结构以及非晶合金的晶体结构与热处理温度的关系.测定了薄膜磁性能(饱和磁化强度和矫顽力)随热处理温度变化的关系曲线.结果表明,薄膜中钼含量(质量分数)为6.05%～30.03%时,镀态Co-Mo合金薄膜具有非晶态结构;经连续升温到400℃并热处理1.5 h后,Co-Mo非晶态合金发生晶化,且随着薄膜中钼含量的增加,薄膜的晶化温度提高,热稳定性增强;在较高温度(高于500 ℃)下热处理后,Co-Mo非晶态合金晶化,并析出单一的hcp-Co相;热处理后,Co-Mo合金薄膜的软磁性变差.     

电沉积Co–Mo合金薄膜的结构和热稳定性

通过电沉积,在铜基体上制备了Co–Mo合金薄膜。讨论了薄膜组成与结构以及非晶合金的晶体结构与热处理温度的关系。测定了薄膜磁性能(饱和磁化强度和矫顽力)随热处理温度变化的关系曲线。结果表明,薄膜中钼含量(质量分数)为6.05%~30.03%时,镀态Co–Mo合金薄膜具有非晶态结构;经连续升温到400°C并热处理1.5h后,Co–Mo非晶态合金发生晶化,且随着薄膜中钼含量的增加,薄膜的晶化温度提高,热稳定性增强;在较高温度(高于500°C)下热处理后,Co–Mo非晶态合金晶化,并析出单一的hcp-Co相;热处理后,Co–Mo合金薄膜的软磁性变差。     

钛纳米高分子合金涂料在油气田防腐领域的应用

介绍了新型纳米改性含氟聚芳醚酮聚合物及其钛纳米高分子合金涂料的制备与性能评价.与目前国内外油井管所用涂料进行性能比较,表明钛纳米高分子合金涂料在附着力、抗冲击性、涂层硬度、耐磨损性、耐高温、高压性等物理性能和耐化学腐蚀性方面具有明显的技术优势.另外,介绍了纳米有机钛重防腐涂料的开发与应用前景.     

专利信息

提高陶瓷接头高温性能的方法本发明属于材料加工技术领域,采用铝、钛、铝,或铝、镍、铝,或钛、镍、钛构成多层金属中间层,其步骤为:(1)在被连接材料之间插入三层结构的多层金属中间层;(2)放入真空炉中,加压、加热、保温,冷却至室温即可形成耐高温性能较好的接头。本发明能在较低温度下使用(在此温度下陶瓷性能不受损伤),不使用贵金属合金,接头在600℃下有较高的力学性能,具有低成本、低消耗等优点。半固态连接材料制备与使用本发明属于材料加工技术领域,其制作方法包括在铝基合金中添加可与铝形成金属间化合物的合金元素,在低真空中或氩气保…     

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。     

Corrosion behaviour of epoxy coatings electrodeposited on galvanized steel and steel modified by Zn–Ni alloys

The electrochemical and transport properties and thermal stability of epoxy coatings electrodeposited on hot-dip galvanized steel and steel modified by Zn–Ni alloys were investigated during exposure to 3% NaCl solution. Zn–Ni alloys were electrodeposited on steel by direct and pulse current. From the time dependence of pore resistance, coating capacitance and relative permittivity of epoxy coating, diffusion coefficient of water through epoxy coating, D(H₂O) and thermal stability, it was shown that Zn–Ni sublayers significantly improve the corrosion stability of the protective system based on epoxy coating. Almost unchanged values of pore resistance were obtained over the long period of investigated time for epoxy coatings on steel modified by Zn–Ni alloys, indicating the great stability of these protective systems, due to the existence of the inner oxide phase layer and the outer layer consisting of basic salts.     

Ni and Mo coatings as hydrogen cathodes

The catalytic activity of hydrogen cathodes based on Ni/Mo coatings prepared in different ways has been investigated under conditions of advanced alkaline water electrolysis in 10m KOH at 100°C, in the current density range 0.05–1.0 A cm^–2. The activity of electrodeposited Ni/Mo and Ni/Mo/V coatings was quite low, apparently due to their low effective surface area. The activity of all thermally deposited Ni/Mo coatings, electrodeposited Ni/Mo/Cd coatings and of Raney nickel-Mo alloys has been found to be high. When accompanied by some current interruptions of various durations, however, it successively decreased during long-time electrolysis, especially when the residual potential of the electrode, after the current interruption, approached a certain threshold value. The rate of electrode deactivation depends on its mode of preparation as well as on electrolysis conditions, particularly on conditions during the current interruptions. The Mo content in the coating decreased quickly by a factor of 2–10 under operating values of both Tafel constants. The addition of Mo to the expressed as an increase in the absolute values of both Tafel constants. The addition of Mo to the Raney nickel improves its catalytic efficiency as long as Mo is not dissolved. The enhancing of catalytic activity by Mo in Raney nickel is partly caused by synergetic effects between Ni and Mo, as follows from their electronic structure, and partly by material stabilization as follows from comparison with the Raney nickel (Zn).     

Electrochemical and sorption characteristics and thermal stability of epoxy coatings electrodeposited on steel modified by Zn–Co alloy

The corrosion behaviour, transport properties and thermal stability of epoxy coatings electrodeposited on steel and steel modified by Zn–Co alloys were investigated during exposure to 3% NaCl solution. The electrochemical impedance spectroscopy (EIS), gravimetric liquid sorption measurements and thermogravimetric analysis (TGA) were used. Zn–Co alloys were electrodeposited on steel from chloride and sulphate baths, by different current densities. From the time dependence of pore resistance and coating capacitance of epoxy coating, diffusion coefficient of water through epoxy coating and thermal stability it was shown that Zn–Co sublayer obtained from chloride solution significantly improves the corrosion stability of the protective system based on epoxy coating. Almost unchanged values of pore resistance were obtained over the long period of exposure time, indicating the great stability of this protective system, due to the existence of a passive layer consisting of basic salts.     

Electrochemical deposition and characterization of ZnCo alloys and corrosion protection by electrodeposited epoxy coating on ZnCo alloy

ZnCo alloys electrochemically deposited on steel under various deposition conditions were investigated. The influence of deposition current density, temperature and composition of deposition solution on the phase structure and corrosion properties of ZnCo alloys were studied. It was found that ZnCo alloy obtained from chloride solution at 5 A dm⁻² showed the best corrosion properties, so this alloy was chosen for further examination. Epoxy coating was electrodeposited on steel and steel modified by ZnCo alloy using constant voltage method. The effect of ZnCo alloy on the corrosion behavior of the protective system based on epoxy coating is interpreted in terms of electrochemical and transport properties, as well as of thermal stability.     

深共融溶剂中电沉积Ni-Mo合金及其催化析氢性能

在深共融溶剂体系中电沉积制备了Ni-Mo合金.利用扫描电镜(SEM)、X射线衍射仪(XRD)及电化学测试对Ni-Mo合金形貌、结构及性能进行了表征.SEM、XRD测试结果表明,Ni-Mo合金为纳米晶结构,平均晶粒尺寸约为2.2 nm;镀层表面微观粗糙度较大,Mo的质量分数约为5%.阴极极化曲线测试结果表明,当电流密度为0.1 A·cm^-2时,深共融溶剂中制备的Ni-Mo合金电极析氢电位比水溶液中制备的Ni-Mo合金电极正移约100 mV,相比纯Ni电极正移近250 mV.     

电沉积Ni-P合金镀层耐蚀性的研究

研究了不同磷含量的Ni-P合金镀层在NaCl介质中的耐腐蚀性能。通过浸泡实验,得出不同磷含量的Ni-P合金镀层在w（NaCl）=5%和饱和NaCl溶液中的腐蚀数据,同时还与纯镍镀层、化学镀Ni-P合金镀层、1Cr18Ni9Ti不锈钢以及A3钢进行了比较。     

Electrodeposition and characterization of Zn–Ni alloys as sublayers for epoxy coating deposition

The chemical composition and phase structure of Zn–Ni alloys obtained by electrodeposition under various conditions were investigated. The influence of the deposition solution and deposition current density on the composition, phase structure, current efficiency and corrosion properties of Zn–Ni alloys were examined. It was shown that the chemical composition and phase structure affect the anticorrosive properties of Zn–Ni alloys. A Zn–Ni alloy electrodeposited from a chloride solution at 20 mA cm^–2 exhibited the best corrosion properties, so this alloy was chosen for further examination. Epoxy coatings were formed by cathodic electrodeposition of an epoxy resin on steel and steel modified with a Zn–Ni alloy. From the time dependence of the pore resistance, coating capacitance and relative permittivity of the epoxy coating, the diffusion coefficient of water through the epoxy coating, D(H₂O), and its thermal stability, it was shown that the Zn–Ni sublayer significantly affects the electrochemical and transport properties, as well as the thermal stability of epoxy coatings. On the basis of the experimental results it can be concluded that modification of a steel surface by a Zn–Ni alloy improves the corrosion protection of epoxy coatings.     

碳纤维表面电沉积合金（复合）镀层初步研究

采用电化学沉积的方法,在聚丙烯腈基碳纤维表面制备了Ni–Fe、Fe–P、Ni–B合金及Fe–Cr2O3复合镀层。结果表明:碳纤维表面的预处理对合金(复合)镀层与基底间的结合力有重要影响。扫描电子显微镜结果显示,未经活化处理的碳纤维表面镀层与基体的结合力差,表面有裂纹;表面活化处理后的镀层细致,均匀,结合力好。通过改变与合金元素相应的电解质浓度可改变镀层中合金元素的含量,获得具有不同合金含量的、与碳纤维结合紧密的合金或复合镀层。