Electrochemical Preparation and Characterization of Ni-PTFE Composite Coatings from a Non-aqueous Solution Without Additives
首发时间:2012-12-07
Abstract:Electrodeposition process of Ni-polytetrafluoroethylene (PTFE) composite coatings is limited to use aqueous plating bath where nonionic/cationic wetting agents usually are necessary to prohibit the hydrophobic PTFE particles being coagulated. This study proposes a novel electrolyte for the depositing Ni-PTFE composite coatings which is formed in a deep eutectic solvent (DES). The DES with a non-aqueous nature allows the PTFE particles well be dispersed in the electrolyte without the additive of any wetting agents. The Ni-PTFE composite coatings are successfully electrodeposited from the proposed DES-based plating bath which is confirmed by the scanning electron microscope and X-ray energy dispersive spectroscope. Deposition mechanism, microstructure, and properties of the composite coatings are investigated. Importantly, it is found that the Ni-3.1wt.% PTFE composite coating shows a hydrophobic behavior with a contact angle of about 121±1 and an enhanced wear resistance than the pure Ni coating due to the incorporation of PTFE.
keywords: Electrodeposition Ni-PTFE composite Cyclic voltammetry Deep Eutectic Solvent
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不含添加剂的非水性溶剂中Ni-PTFE复合薄膜的电沉积制备和表征
摘要:在水溶液体系中电沉积制备Ni-PTFE复合镀往往受到限制,因为在水性溶液体系中PTFE颗粒疏水易于团聚,需要阴阳离子润湿剂以防止颗粒团聚。本文提出一种新的Ni-PTFE复合镀膜电沉积制备方法,利用深共熔溶剂(DES)中进行电沉积制备。DES是一种非水性溶剂,在不加任何润湿剂的条件,PTFE颗粒可以很好的分散在此溶剂中。SEM扫描电镜图和能谱表明:Ni-PTFE复合镀膜成功地在深共熔溶液中电沉积制备出。本文进一步研究了电沉积机理,镀层的微结构和性能。结果表明:Ni-3.1wt.% PTFE的复合镀层表现出疏水性,其接触角为121±1 以及较好的耐摩擦性能。
关键词: 电沉积 Ni-PTFE复合物 循环伏安 深共熔溶剂
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