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Информация о статье:
| Раздел/Section | Электроосаждение металлов и сплавов | Electroplating of metals and alloys |
| Страницы/Pages | 41-44 | |
| Заглавие/Title | Исследование закономерностей хромирования из ионной жидкости на основе холин хлорида и хлорида хрома (III) | A study of Chromium Plating from Ionic Liquids on the Basis of Choline Chloride and Chromium(III) Chloride |
| Авторы/Authors | Солодов А.С., Солодов М.С., Соболева Е.С., Кошель С.Г. | Solodov A.S., Solodov M.S., Soboleva E.S., Koshel S.G. |
| Ключевые слова Keywords | хромирование, трехвалентный хром, ионная жидкость, электроосаждение, холин хлорид, поляризационные исследования, микротвердость, chromium plating, trivalent chromium, ionic liquid, electrodeposition, choline chlorate, polarization measurements, micro hardness | |
| Аннотация Description | Проведены исследования электропроводности ионной жидкости в зависимости от соотношения компонентов в ней. Исследовано влияние температуры и плотности тока на выход по току хрома. Проведено исследование прочности сцепления и микротвердости хромовых покрытий, получаемых из ионной жидкости. | Ionic liquids attracted interest of scientists only in recent two decades and this interest continues to grow up. About 1995 a term "ionic liquid" was introduced to designate molten organic salts comprising of large organic cations and inorganic or organic anions with melting temperature below 100°C [1]. Experiments have demonstrated that electrodeposition of metals from ionic liquids containing particular metal cation proceedes easily [2]. Chromium plating is still one of most widely used processes in electroplating, and by this reason the goal of this work was to study chromium plating process from ionic liquid containing Cr III. Following molar ratio of components: choline chlorate: chromium III as CrCl3•6H2O were studied: 1:2;1:1; 2:1.3:1. The process was carried out 1-14 A/dm2 and 40-60°C. Temperature dependence of specific conductivity at different molar rations is shown in Fig. 1. In all cases increasing conductivity with rising temperature was observed and maximum conductivity corresponds to 3 to 1 ratio. Effect of current density at different temperatures is shown at Fig. 2. At high current density current efficiency is increasing, however, dull deposits are formed which have poor adhesion to the substrate. The area of light bright coatings shifts to higher current densities with rising temperatures (Fig. 3). Optimum thickness of chromium coating ranges from 1 to 20 microns. Micro hardness varies from 600 to 800 HV. One of possible defects deposited from the ionic liquid is surface roughness (Fig. 4) caused by slow removal of hydrogen bubbles from metal surface dew to relatively high dynamic viscosity of the ionic liquid. |
| Текст/Text | http://elibrary.ru/item.asp?id=21302002 | |