Abstract

Pure lead powder can be electrodeposited by reduction of lead ions (Pb²⁺) in aqueous electrolyte. In this investigation, ultra-fine lead powders with a minimum median diameter of 4.5 μm were electrodeposited in acetate solution. The formation mechanism of lead oxide (PbO) during electrodeposition was proposed. Operation parameters such as pH value, current density, and gelatin had remarkable influence on oxidation degree, median diameter, and current efficiency, which were detailed for the first time. Metallic Pb was formed with strong (111) preferred orientation, and micrography, composition, and structure were characterized. Amorphous PbO was found in as-deposited lead powder, and a gel-layer process was proposed to elucidate the formation of PbO. It was suggested the Pb···OH was the most important intermediate state to form PbO and the gel-layer played the key role in generation of pure lead powder.

中文翻译：

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深入了解电沉积过程中铅粉的氧化

摘要

可以通过还原铅离子（Pb ²⁺）在电解质水溶液中。在这项研究中，将最小中值直径为4.5μm的超细铅粉电沉积在醋酸盐溶液中。提出了电沉积过程中氧化铅（PbO）的形成机理。pH值，电流密度和明胶等操作参数对氧化度，中值直径和电流效率具有显着影响，这是首次详细介绍。形成具有强（111）优先取向的金属Pb，并表征了显微照片，组成和结构。在沉积的铅粉中发现了非晶态PbO，并提出了凝胶层工艺来阐明PbO的形成。提示Pb···OH是形成PbO的最重要的中间状态，凝胶层在纯铅粉的产生中起关键作用。