ISSN:
1572-8838
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
,
Elektrotechnik, Elektronik, Nachrichtentechnik
Notizen:
Abstract The electrodeposition has been studied of nickel-cobalt-zinc alloys from a borate bath containing nickel sulphate (120–140 g dm−3), cobalt sulphate (30–46 g dm−3), zinc sulphate (144–168 g dm−3), boric acid (30 g dm−3) and ammonium chloride (2 g dm−3). The operating conditions were: current density, 2.0–5.0 A dm−2; temperature, 30–40°C and pH, 2.4 to 5.4. Light grey, semibright, stressed films have been obtained. However, the deposits consist partially of black powder when the concentration of the various components is increased. The brightness is found to increase with decreasing temperature and pH of the solution. The total cathode efficiency increases when the pH and temperature of the solution decrease, whereas at any particular pH and temperature it first decreases, reaches a minimum and then increases with increasing current density.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00615173
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