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A Study on Zinc-Iron Alloy Electrodeposition from a Chloride Electrolyte 氯化物电解液电沉积锌铁合金的研究
IF 1.9 4区 材料科学 Q4 ELECTROCHEMISTRY Pub Date : 1998-01-01 DOI: 10.1080/00202967.1998.11871221
J. Jensen, G. Critchlow, D. Gabe
The electrodeposition of zinc-iron alloys from a chloride-based electrolyte has been studied using electrochemical polarisation techniques, Auger Electron Spectroscopy (AES), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDXA) and Computer Assisted Pulse Plating (CA PP). A change in the electrodeposition mechanism from equilibrium codeposition to anomalous codeposition with a change in cathodic current density has been observed. Zn-Fe alloys with compositions ranging from less than 5 wt-% to more than 75 wt-% Fe have been electrodeposited from a single electrolyte, making this system ideal for production of compositional modulated alloy (CMA) electrodeposits. Chloride content, pH and agitation of the electrolyte have been observed to have a strong influence on the reaction at the cathode surface, just as the use of pulse reversal current during electrodeposition. A theory on the electrodeposition mechanism, accounting for the above observations, is presented.
利用电化学极化技术、埃歇电子能谱(AES)、扫描电子显微镜(SEM)、能量色散x射线分析(EDXA)和计算机辅助脉冲电镀(CA PP)研究了氯化物基电解质中锌铁合金的电沉积。随着阴极电流密度的变化,电沉积机制从平衡共沉积转变为异常共沉积。锌-铁合金的成分范围从小于5wt -%到大于75wt -%的铁已经从单一的电解液中电沉积,使该系统非常适合生产成分调制合金(CMA)电沉积。氯化物含量、pH值和电解质的搅拌对阴极表面的反应有很强的影响,就像在电沉积过程中使用脉冲反转电流一样。根据上述观察结果,提出了电沉积机理的理论。
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引用次数: 15
Ellipsometric study of passive films on the stainless steel SS304 不锈钢SS304钝化膜的椭偏研究
IF 1.9 4区 材料科学 Q4 ELECTROCHEMISTRY Pub Date : 1998-01-01 DOI: 10.1080/00202967.1998.11871232
S. Phadnis, M. Totlani, D. Bhattacharya
Four surface treatments were given to AISI 304 SS in the cold-worked and heat-treated condition. The surface treatments were: exposure to laboratory air, exposure to 20% HNO 3 , anodization in H 2 SO 4 with and without dissolved oxygen. Passive films thus obtained were characterised ellipsometrically and the refractive index and thickness values were measured. It was seen that the refractive index of films obtained in all cases except one was around 2.52, while in the case of the film obtained after anodization in H 2 SO 4 with dissolved oxygen, it was seen to be 2.46. The thickness of films varied from 46 to 129 A depending on the surface treatment. Heat-treatment appeared to have little effect on the type of film formed.
对AISI 304不锈钢在冷加工和热处理条件下进行了四种表面处理。表面处理为:暴露于实验室空气中,暴露于20%的hno3中,在h2so4中有溶解氧和无溶解氧阳极氧化。用椭偏法对所得钝化膜进行了表征,并测量了其折射率和厚度。结果表明,除1种膜外,其余膜的折射率均在2.52左右,而溶解氧在h2so4中氧化后的膜折射率为2.46。薄膜的厚度根据表面处理的不同从46到129a不等。热处理似乎对形成的薄膜类型影响不大。
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引用次数: 7
Pretreatments to Improve the Bondability of Hot Dipped Galvanised Mild Steel 提高热镀锌低碳钢结合力的预处理
IF 1.9 4区 材料科学 Q4 ELECTROCHEMISTRY Pub Date : 1998-01-01 DOI: 10.1080/00202967.1998.11871225
G. Critchlow, K. Bedwell, M. Chamberlain
It is well-established that some degree of surface pretreatment is vitally important in providing optimised adhesive bonds with metallic adherends. To date, much work has been carried out to determine the effectiveness of different pretreatments with aluminium, titanium and mild steel adherends, however, hot dipped galvanised (HDG) mild steel has received relatively little attention. In the present study, a range of pretreatments has been considered in terms of how they modify the HDG surface and how they perform in providing initial joint strengths and long-term durability. The chemical changes have been studied using Auger electron spectroscopy whilst the topography has been monitored using electron microscopy. The single lap shear joint (SLS) configuration was used to assess initial joint strengths and stressed SLS joints were exposed by complete immersion in deionised water with times-to-failure recorded as the measure of durability. A novel CO 2 -laser based cleaning process has been used for comparative purposes alongside the more conventional wet chemical pretreatments.
这是公认的,一定程度的表面预处理是至关重要的,以提供与金属附着物的最佳粘合键。迄今为止,已经进行了大量的工作来确定铝,钛和低碳钢粘附体的不同预处理的有效性,然而,热浸镀锌(HDG)低碳钢受到的关注相对较少。在目前的研究中,我们考虑了一系列的预处理,包括它们如何修饰HDG表面,以及它们如何提供初始关节强度和长期耐久性。化学变化已研究使用俄歇电子能谱,而形貌已监测使用电子显微镜。单搭接剪切接头(SLS)配置用于评估初始接头强度,应力SLS接头通过完全浸泡在去离子水中暴露,并记录失效时间作为耐久性指标。一种新型的二氧化碳激光清洁工艺与传统的湿式化学预处理一起用于比较目的。
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引用次数: 7
An investigation of activation of PTFE and graphite fine particles prior to electroless plating 化学镀前聚四氟乙烯和石墨微粒活化的研究
IF 1.9 4区 材料科学 Q4 ELECTROCHEMISTRY Pub Date : 1998-01-01 DOI: 10.1080/00202967.1998.11871198
A. Karam, J. Krafft, G. Stremsdoerfer
This study examines the activation step, prior to electroless plating, of two of the most used particles in the field of electrochemical composite coating: PTFE and graphite. It has been identified that PTFE particles show an unusual behaviour according to the diameter size of the mixed Pd/Sn colloidal catalyst. It appears that the geometry of these micronic particles strongly affects the activation step. Only small colloidal catalysts with a 3 nm diameter can activate the surface efficiently without any surface pre-treatment. A detailed description and an explanation of this phenomenon are given.
本研究考察了化学镀前的两种最常用的电化学复合涂层颗粒:PTFE和石墨的活化步骤。根据钯锡混合胶态催化剂的直径大小,发现PTFE颗粒表现出不同寻常的行为。结果表明,这些微粒的几何形状对活化过程有很大的影响。只有直径为3nm的小型胶体催化剂才能在不进行任何表面预处理的情况下有效激活表面。对这一现象作了详细的描述和解释。
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引用次数: 4
Study of the Formation of Zinc Phosphate Layers on AA5754 Aluminium Alloy AA5754铝合金表面磷酸锌层形成的研究
IF 1.9 4区 材料科学 Q4 ELECTROCHEMISTRY Pub Date : 1998-01-01 DOI: 10.1080/00202967.1998.11871185
I. Roy, H. Terryn, G. Goeminne
SummaryZinc phosphating of aluminium alloys is a conversion treatment that can be used for automotive applications to improve the adhesion properties and the corrosion resistance. In this paper the influence of the aluminium pretreatment on the formation of the zinc phosphate layer is studied. The growth of the zinc phosphate layer was examined on degreased, etched and electropolished aluminium AA5754 surfaces, using a Scanning Electron Microscope (SEM). A batch phosphating procedure, representative for the industrial process, was introduced. The surface condition of the aluminium, determined by the selection of the pretreatment procedure, has an influence on the number and sizes of the zinc phosphate crystals present on the aluminium surface. The formation of the layer can be divided into two steps: the initiation and the growth. It is shown that especially the initiation step is influenced by the condition of the substrate prior to phosphating. By means of high sensitivity and high resolution techniques...
摘要铝合金的锌磷化是一种转化处理,可用于汽车,以提高附着力和耐腐蚀性。本文研究了铝预处理对磷酸锌层形成的影响。用扫描电子显微镜(SEM)观察了脱脂、蚀刻和电抛光的AA5754铝表面磷酸锌层的生长情况。介绍了具有工业代表性的间歇式磷化工艺。铝的表面状况由预处理工艺的选择决定,对铝表面存在的磷酸锌晶体的数量和大小有影响。层的形成可分为起始和生长两个阶段。结果表明,磷化前的衬底条件对起始阶段影响较大。通过高灵敏度和高分辨率技术…
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引用次数: 7
A Rapid Electrochemical Test for Porosity in Electroless Nickel Coatings on Carbon Steel Substrates 碳钢基体上化学镀镍镀层孔隙率的快速电化学测试
IF 1.9 4区 材料科学 Q4 ELECTROCHEMISTRY Pub Date : 1998-01-01 DOI: 10.1080/00202967.1998.11871188
A. Nahlé, C. Kerr, B. D. Barker, F. C. Wals
SummaryA rapid electrochemical test for the determination of porosity in electroless nickel coatings on carbon steel is described. The technique is based on the charge under the anodic peaks during the reverse cathodic scan of the cyclic voltammograms for various immersion times (ranging from 0 to 2 hours) of nickel-coated steel samples (0 to 24 μm thickness) in a solution consisting of 150 mL of 0.1 M H2SO4 and 10 mL of 0.1 M K4Fe(CN)6 at 298 K. It was found that approximately 44% of the steel area remained uncovered with nickel after 2 minutes deposition time (0.4 μn thick). This percentage of uncovered area with nickel decreased to approximately 3 % when the steel samples had been immersed for 14 minutes (2.8 μm thick); essentially complete coverage occurred after an immersion time greater than 30 minutes (6 μm thick).
介绍了一种快速测定碳钢化学镀镍层孔隙率的电化学试验方法。该技术是基于不同浸泡时间(0至24 μm厚度)的镀镍钢样品(0至2小时)在由150 mL 0.1 M H2SO4和10 mL 0.1 M K4Fe(CN)6组成的溶液中,在298 K下循环伏安图的反向阴极扫描中阳极峰下的电荷。结果表明,沉积时间为2 min (0.4 μn厚)后,约44%的钢区未被镍覆盖。当钢样品(2.8 μm厚)浸泡14分钟后,含镍未覆盖面积的百分比降至约3%;浸渍时间大于30分钟(6 μm厚)后基本完全覆盖。
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引用次数: 14
Electron Microscope Observations on Electrolytic Ni-Mo-Fe Coatings Ni-Mo-Fe电解镀层的电镜观察
IF 1.9 4区 材料科学 Q4 ELECTROCHEMISTRY Pub Date : 1998-01-01 DOI: 10.1080/00202967.1998.11871189
M. Ananth, N. V. Parthasaradhy
SummarySelected Ni-Mo-Fe coatings were electrodeposited from ammoniacal citrate baths by varying the plating parameters. Their surfaces were examined by scanning electron microscopy for topography and SE imaging. Observed electrocatalytic, corrosion and optical properties of the coatings were found to be dependent on surface structure. The results were also used to understand the influence of electrodeposition variables. The plating diameters were found to have strong influence on the surface structure. Increases in deposition CD resulted in phase segregation in these materials. Also it was confirmed that increases in molybdenum content of the plating bath introduced heterogeneity in the plated samples with occurrence of more than one phase. Multinucleation in crystal structure was observed in samples electrodeposited at near neutral pH levels, again due to increased molybdenum content. The coatings reveal network formation at 300°C. Inclusion of Mn was helpful in obtaining homogeneous deposits.
通过改变镀工艺参数,在柠檬酸铵液中制备了Ni-Mo-Fe镀层。用扫描电子显微镜观察其表面形貌和SE成像。发现涂层的电催化、腐蚀和光学性能与表面结构有关。结果还用于了解电沉积变量的影响。镀层直径对镀层表面结构有较大的影响。沉积CD的增加导致了这些材料的相偏析。结果表明,随着镀液中钼含量的增加,镀层中出现了多相的非均质性。在接近中性pH水平下电沉积的样品中观察到晶体结构的多核化,这也是由于钼含量的增加。涂层在300℃时形成网状结构。锰的包裹体有助于获得均质矿床。
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引用次数: 1
Synergistic Effects of LIX 64N and Fe3+During Copper Electrowinning 铜电积过程中LIX - 64N和Fe3+的协同效应
IF 1.9 4区 材料科学 Q4 ELECTROCHEMISTRY Pub Date : 1998-01-01 DOI: 10.1080/00202967.1998.11871203
N. Pradhan, P. G. Krishna, Sudipta Das
The synergistic effects of additive LIX 64N and Fe 3+ during copper electrowinning from sulphate electrolyte were investigated. The results show that the combination of LIX 64N and Fe 3+ affects current efficiency, deposit quality, crystallographic orientation and surface morphology of cathode copper. Electrolysis parameters like current density, circulation rate and temperature have appreciable influence on the synergistic effects of LIX 64N and Fe 3+ . The presence of either L1X 64N or Fe 3+ favoured pyramidal growth whereas their combination promoted ridge type structure. Addition of thiourea not only improved the current efficiency but also the deposit quality.
研究了添加剂LIX - 64N和fe3 +在硫酸盐电解液电积铜过程中的协同作用。结果表明:LIX - 64N与fe3 +的结合影响了阴极铜的电流效率、镀层质量、晶体取向和表面形貌;电流密度、循环速率、温度等电解参数对LIX 64N与fe3 +的协同效应有明显影响。l1x64n和fe3 +的存在有利于金字塔型生长,而它们的结合促进了脊型结构。硫脲的加入不仅提高了电流效率,而且提高了镀层质量。
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引用次数: 2
Preparation of Ni-B Amorphous Alloy Films by Electrodeposition Using a Rotating Electrode and Their Structural Changes 旋转电极电沉积制备Ni-B非晶合金薄膜及其结构变化
IF 1.9 4区 材料科学 Q4 ELECTROCHEMISTRY Pub Date : 1998-01-01 DOI: 10.1080/00202967.1998.11871191
M. Onoda, K. Shimizu, Yukio Tateishi, Tohru Watanabe
SummaryElectrodeposition of Ni-B group alloys was conducted using a rotary electrode. The changes in the amount of codeposited B and in the hydrogen content that arise from changes in plating conditions, and the resulting structural chnages in the films were examined The following results were obtained: 1. The films prepared using a cylindrical rotating electrode contain a larger amount of codeposited B compared to those prepared in a static bath.2. When the Ni-B amorphous alloy with a B content exceeding 25 at % is prepared using a rotary electrode, the film structure after heat treatment corresponds to the structures of the intermetallic compounds Ni3B and Ni2B in the thermal equilibrium diagram.3. Although the hydrogen content of Ni-B alloy films are influenced by the current density, they correlate most strongly with the amount of codeposited B.
摘要采用旋转电极对Ni-B族合金进行了电沉积。研究了镀层条件变化引起的共沉积B量和氢含量的变化,以及由此引起的薄膜结构变化。与在静态浴中制备的膜相比,使用圆柱形旋转电极制备的膜含有更多的共沉积B。用旋转电极制备B含量超过25at %的Ni-B非晶合金时,热处理后的薄膜结构与热平衡图中金属间化合物Ni3B和Ni2B的结构相对应。虽然Ni-B合金薄膜的氢含量受电流密度的影响,但它们与共沉积B的量相关性最强。
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引用次数: 8
Determination of tertiary current distribution in electrodeposition cells- Part 2. Prediction of current distribution on shaped cathodes with moving electrolyte 电沉积槽中三次电流分布的测定。第2部分流动电解质下异形阴极电流分布的预测
IF 1.9 4区 材料科学 Q4 ELECTROCHEMISTRY Pub Date : 1998-01-01 DOI: 10.1080/00202967.1998.11871196
A. Averill, H. S. Mahmood
A new approach is adopted for the numerical determination of tertiary current distribution on complex shaped electrodes with moving electrolytes. In the second part of this paper the practical application of the method to estimating the current distribution and deposit thickness profile on shaped and angular cathodes is described.
采用一种新的方法,对具有运动电解质的复杂形状电极上的三次电流分布进行了数值计算。本文的第二部分描述了该方法在估计形阴极和角阴极上电流分布和镀层厚度分布中的实际应用。
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引用次数: 4
期刊
Transactions of The Institute of Metal Finishing
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