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Электроосаждение сплавов Ni-Mo и Ni-W из аммиачно-цитратных электролитов, содержащих молибденовые и вольфрамовые сини
| Раздел |
[RUS] Электроосаждение металлов и сплавов [ENG] Electroplating of metals and alloys |
| Страницы | 22-29 |
| Тип | [RAR] - Научная статья |
| Коды | |
| Заглавие |
[RUS] Электроосаждение сплавов Ni-Mo и Ni-W из аммиачно- цитратных электролитов, содержащих молибденовые и вольфрамовые сини [ENG] Electrodeposition of Ni-Mo and Ni-W alloys from ammonia-cytrate baths containing molybdenum and tungsten blues |
| Авторы |
[RUS] Павлова Нина Владимировна 125047, Москва, Миусская пл., д.9, тел. (499)978-59-90 РХТУ им.Д.И.Менделеева к.х.н., научный сотрудник; кафедра ТЭП [ENG] Pavlova Nina V. 125047, Moscow, Miusskaya sq. 9. Tel. (499)978-59-90 PhD, research worker [RUS] Нанда Ту 125047, Москва, Миусская пл., д.9, тел. (499)978-59-90 РХТУ им.Д.И.Менделеева аспирант [ENG] Nanda Tu 125047, Moscow, Miusskaya sq., 9; Tel. (499)978-59-90 Mendeleyev University of Chemical Technology of Russia [RUS] Павлов Михаил Рашитович 125047, Москва, Миусская пл., д.9, тел. (499)978-59-90 РХТУ им.Д.И.Менделеева к.х.н., научный сотрудник [ENG] Pavlov Mihail R. 125047, Moscow, Miusskaya sq., 9; Tel. (499)978-59-90 Mendeleyev University of Chemical Technology of Russia PhD, research worker [RUS] Кудрявцев Владимир Николаевич 125047, Москва, Миусская пл., д.9, тел. (499)978-59-90 gtech@muctr.ru РХТУ им.Д.И.Менделеева Доктор химических наук, профессор, заведующий кафедрой ТЭП [ENG] Kudryavtsev Vladimir N. 125047, Moscow, Miusskaya sq., 9; Tel. (499)978-59-90 gtech@muctr.ru Mendeleyev University of Chemical Technology of Russia Doct.Sci, Prof |
| Аннотация |
[RUS] Исследовано электроосаждение сплавов Ni-Mo и Ni-W из электролитов, приготовленных, соответственно, из солей на основе молибденовых и вольфрамовых синей. Установлено, что частичная или полная замена шестивалентного молибдена на пятивалентный расширяет диапазон потенциалов и плотностей тока, в котором осаждаются низкопористые, хорошего качества, без краевых эффектов покрытия сплавом Ni-Mo. Показана возможность осаждения из этих электролитов металлического молибдена. Аналогичного эффекта при электроосаждении сплава Ni-W из электролитов на основе вольфрамовых синей обнаружить не удалось. [ENG] Electrodeposition of Ni-Mo and Ni-W alloys from ammonia cytrate solutions based on molybdenum and tungsten blues respectively was studied. It was found that replacement of Mo(VI) by molybdenum blue (range of molybdenum effective oxydation state (EOS) was +5,0 ? 6,0) leads to a sharp decrease of minimum current density (imin) at which the alloy without the inclusion of molybdenum oxides can be deposited (Figs.1 and 2). It was shown that compact, light, low-porous Ni-Mo alloys without edge effects are deposited from electrolytes prepared on the base of molybdenum blue in a wide range of current densities (Table 2). Composition and CE of Ni-Mo alloy insignificantly depend on current density (Fig.3). Long aging of electrolytes based on molybdenum blue was found to practically dont influence on their composition and properties (Table 1). Oxidation rate of pentavalent molybdenum in ammonia citrate baths is low and is about 0,06 mM/day. It confirms satisfactory stability of these baths. Polarografic study revealed that molybdenum reduction in electrolytes prepared on the base of molybdenum blue at pH 3,0 is more deep than that in electrolytes based on MoO4 2-. It was found that molybdenum as metal can be obtained from baths based on molybdenum blue containing no metal-codepositers (Fig. 6). Ni- Mo alloy with Mo content of about 87 at.% can be deposited from electrolytes containing small quantities of nickel ions at high current densities. It was found that good quality of Ni-W alloys without edge effects can be electrodeposited from baths based on tungsten blue. Range of current densities of such alloys electrodeposition is wider that the same for bath based on W(VI). At the same time addition of even small quantities of pentavalent tungsten in the bath with tungsten (VI) compounds leads to a significant suppression of alloy deposition and, especially, tungsten (Fig. 7) It was shown that the oxidation rate of pentavalent tungsten in these baths is very high and is about 48 mM W (+5) / day. In the presence of ascorbic acid oxidation rate of W (+5) reduced to 0,2 mM W (+5) / day. Polarografic study revealed that replacement of WO4 2- by tungsten blue does not effect on the depth of tungsten discharge. Therefore baths on the base of tungsten blue is not so promising as baths on the base of molybdenum blue. |
| Текст | |
| Ключевые слова |
[RUS] аммиачно-цитратный электролит молибденовая синь |
| Ссылки |
1. Brenner A. Electrodeposition of alloys. Principles and practice. Academic press, New York and London, 1963, v. I.
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