The electrochemical deposition of nanocrystalline zinc has high potential to deposit zinc coatings, which have improved wear and corrosion properties compared to conventional coating methods. Conventionally, two or more additives are used in the electrolyte for the formation nanocrystalline zinc; these electrolyte components are complex, and their maintenance is inconvenient, making it unstable and not suitable for industrial scale production. This paper proposes an electrochemical deposition technique for nanocrystalline zinc using a ZnSO₄ solution with cationic polyacrylamide (CPAM) as the unique additive. The results reveal that the cationic degree of CPAM has a significant influence on the deposition process and that the cationic degree of 20% enhances the electrolyte conductivity and improves the density of the deposited coating. The concentration of CPAM affects the electrolyte viscosity and conductivity. CPAM with a concentration of 20 g/L could simultaneously improve the electrolyte conductivity and maintain the viscosity at a low value, which promotes the formation of a bright deposited coating with a grain size of 87 nm. Additionally, the current density affects the grain structure of the deposited coating. With a current density of 0.5 A/dm², a dense coating with lamellar grains and a grain size of 54.5 nm was obtained, which has, and the surface roughness was reduced to 0.162 μm. Moreover, the corrosion resistant property of the deposited coating was also improved.

中文翻译：

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阳离子聚丙烯酰胺(CPAM)-ZnSO4电解液电化学沉积纳米晶锌的研究

纳米晶锌的电化学沉积在沉积锌涂层方面具有很高的潜力，与传统的涂层方法相比，锌涂层具有改善的磨损和腐蚀性能。通常，电解液中使用两种或多种添加剂来形成纳米晶锌；这些电解液成分复杂，维护不便，不稳定，不适合工业规模生产。本文提出了一种使用 ZnSO ₄纳米晶锌的电化学沉积技术以阳离子聚丙烯酰胺 (CPAM) 作为独特添加剂的溶液。结果表明，CPAM的阳离子度对沉积过程有显着影响，20%的阳离子度提高了电解质的电导率，提高了沉积涂层的密度。CPAM 的浓度影响电解质的粘度和电导率。浓度为 20 g/L 的 CPAM 可以同时提高电解质的电导率并保持较低的粘度，从而促进形成粒度为 87 nm 的光亮沉积涂层。此外，电流密度影响沉积涂层的晶粒结构。电流密度为 0.5 A/dm ²，获得了具有层状晶粒且晶粒尺寸为 54.5 nm 的致密涂层，其具有，并且表面粗糙度降低至 0.162 μm。此外，沉积涂层的耐腐蚀性能也得到了提高。