Cobalt (II) used as a catalyst to drying properties of healing agents for self-healing coatings / Cobalto (II) utilizado como catalisador de propriedades de secagem de agentes de cura para revestimentos auto-regenerativos

Abstract

Vegetable oils have been largely used as healing agents for self-healing coatings, which in turn, can recover their physical integrity upon damage due to oil film formation resulted of its oxidative polymerization process. Linseed oil (LO) and chia oil (CO) are able to form films because of their air-drying properties and high polyunsaturated fatty acids content. In this work, drying properties of CO and LO with and without cobalt (II) octoate, as a catalyst for the oxidative polymerization, were quantitatively estimated over time by Fourier-Transform Infrared Spectroscopy (FTIR). The CO drying property showed 47% higher than LO and the catalyst has successfully accelerated the oxidative polymerization of both oils in 95%. Microcapsules containing both pure and catalyzed oils were prepared, mixed into epoxy resin, and applied onto AISI 1020 steel samples. Their healing effect was evaluated through a simulated scratch and submitted to electrochemical tests and imaging.

A Preliminary Study of Cobalt Solvent Extraction from Nickel Sulphate Solution using Organic Extractant-PC-88A

“…There are numerous applications for cobalt in the metallurgical, petroleum, chemical, electronic, pharmaceutical, and medical industries because of its unique chemical and physical properties. Cobalt is commonly used in the metallurgical industry to produce alloy metals for gas turbines, nuclear power plants, engine vanes, automotive engines, engine valves, aviation fuel nozzles, and cutting wear-resistant tools [3]- [5], magnetic materials such as Alnico and Samarium cobalt [6]- [8], the catalyst for sulfur removal and oil hydrogenation processes [9]- [11], drying materials for paint, promoters for the polymerization process [12], pigment materials [13]- [14], raw materials for rechargeable batteries [15], Fuel Cell Cathode materials [16], and implant materials for heap joints, dentist, cardiovascular stent [17]- [21]. Cobalt has a broad spectrum application in many industries; therefore cobalt consumption in the world tends to increase [22].…”