Abstract

The composition and structure of Ni–W alloys prepapred from pyrophosphate electrolyte have been studied. It was demionstrated that, regardless of the deposition current density in the range 2–5 A dm^–2, alloys are a single-phase system and represent a solid solution of tungsten in nickel with a face-centered cubic lattice. At low deposition current densities in the coating there exists an impurity oxygen-containing phase of tungsten compounds of an intermediate oxidation state. It was found that the oxygen-containing impurity is distributed unevenly over the coating thickness. Impurity grains are formed only at the initial moment of deposition of the coating at the interface with the substrate together with nickel nanocrystals, and only after some time does the formation of the alloy phase begin. The data obtained are explained in term of the cluster mechanism of induced coprecipitation of alloys of refractory metals with metals of the iron group, proposed earlier.

中文翻译：

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焦磷酸盐电解质沉积Ni-W合金的结构特征

摘要

研究了由焦磷酸盐电解质制备的Ni–W合金的组成和结构。有证据表明，无论沉积电流密度在2–5 A dm ^–2范围内，合金是单相体系，代表钨在镍中的固溶体，具有面心立方晶格。在涂层中的低沉积电流密度下，存在中等氧化态的钨化合物的含杂质氧的相。发现含氧杂质在涂层厚度上不均匀地分布。杂质晶粒仅在与镍纳米晶体一起在与基板的界面处的涂层沉积的初始时刻形成，并且仅在一段时间之后才开始形成合金相。用较早提出的难熔金属与铁族金属的合金诱导共沉淀的簇机理解释了获得的数据。