Abstract

By the example of electrodeposition of Co–W alloys, this work shows that observed peculiarities of induced codeposition, including the macroscopic size effect in the composition and properties of deposited layers and their nanocrystallinity, are a consequence of the fact that the deposition-inducing species (a complex of the deposition-inducing metal) has the form of a high-molecular-weight polymer. Under the conditions of (relatively) high current loading on a plating electrolyte (high volume current density), this results in involvement of water molecules in the electrochemical process, formation of oxy-hydroxide layers, hydrogenation, an increase in the alloy tungsten content as a result of the side reaction of hydrogen evolution, alkalization of near-electrode region, and polymerization of the deposition-inducing metal species. Because of the presence of macroscopic size effect (i.e., the dependences of composition and properties of deposited coatings on the electrodeposition surface area), industrial scaling up of this electrodeposition technology will require maintaining the current loading on a plating bath at a constant level, along with other parameters traditional for electrochemical materials science.

中文翻译：

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诱导共沉积铁族金属钨合金成分与性能的宏观尺寸效应：合金沉积机理及其意义

摘要

通过 Co-W 合金电沉积的例子，这项工作表明，观察到的诱导共沉积的特性，包括沉积层的成分和性能及其纳米结晶度的宏观尺寸效应，是沉积诱导物质这一事实的结果。 (沉积诱导金属的络合物)具有高分子量聚合物的形式。在电镀电解液上（相对）高电流负载（高体积电流密度）的条件下，这会导致水分子参与电化学过程，形成羟基氧化物层，氢化，合金钨含量增加，如下所示：这是析氢副反应、近电极区域碱化以及沉积诱导金属物质聚合的结果。由于存在宏观尺寸效应（即，沉积涂层的成分和性能对电沉积表面积的依赖性），该电沉积技术的工业放大将需要将电镀浴上的电流负载保持在恒定水平，与电化学材料科学的其他传统参数。