Microstructural, surface and electrochemical properties of electrodeposited Ni-WC nanocomposites coatings

IF 1.3 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Lahag Lemya, B. Hachemi, Guettaf Temam Elhachmi
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Abstract

In this work, we study the influences of nano-sized WC particles (diameter size of ∼50 nm), concentrations on the structure, surface morphology, mechanical and electrochemical properties of Ni-WC composite coatings electrodeposited on pretreated copper substrates. The corrosion behavior of Ni-WC composite coatings was studied by the potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods in two corrosion media (0.1 M HCl) and (3.5% NaCl). EDS analysis affirms that WC is the incorporated particles and nickel is the blinder metal. The incorporation of WC particles in the nickel matrix forms heterogeneous deposits that contain deep and narrow pores. XRD pattern indicates good crystal structure with (110), (111), (200) and (311) preferred growth orientations. The reinforcement of Ni matrix by nan-sized WC particles refines the grains size of the coatings. Microhardness and roughness of the deposits increase with the increase of WC concentration in the electrolyte bath. Based on the lowest corrosion density and the highest charge transfer resistance value, corrosion tests show that the samples 4 g/L and 1 g/L immersed in the corrosive media of 3.5% NaCl and 0.1 M HCl are the optimum conditions, respectively.
Ni-WC纳米复合镀层的微观结构、表面和电化学性能
在这项工作中,我们研究了纳米WC颗粒(直径约50 nm)、浓度对镍-WC复合镀层的结构、表面形貌、力学和电化学性能的影响。采用动电位极化和电化学阻抗谱(EIS)方法研究了Ni-WC复合镀层在0.1 M HCl和3.5% NaCl两种腐蚀介质中的腐蚀行为。能谱分析证实WC为掺杂颗粒,镍为遮挡金属。WC颗粒在镍基体中的掺入形成了含有深而窄孔隙的非均质沉积。XRD图谱表明晶体结构良好,生长取向为(110)、(111)、(200)和(311)。纳米WC颗粒对Ni基体的强化使镀层晶粒细化。镀层的显微硬度和粗糙度随电解液中WC浓度的增加而增加。以最低腐蚀密度和最高电荷转移电阻值为依据,腐蚀试验表明,在3.5% NaCl和0.1 M HCl的腐蚀介质中分别浸泡4 g/L和1 g/L的样品为最佳腐蚀条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Main Group Chemistry
Main Group Chemistry 化学-化学综合
CiteScore
2.00
自引率
26.70%
发文量
65
审稿时长
>12 weeks
期刊介绍: Main Group Chemistry is intended to be a primary resource for all chemistry, engineering, biological, and materials researchers in both academia and in industry with an interest in the elements from the groups 1, 2, 12–18, lanthanides and actinides. The journal is committed to maintaining a high standard for its publications. This will be ensured by a rigorous peer-review process with most articles being reviewed by at least one editorial board member. Additionally, all manuscripts will be proofread and corrected by a dedicated copy editor located at the University of Kentucky.
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