In the electrolysis of an acidified copper sulfate solution with a copper wire cathode located vertically along the axis of a cylindrical copper anode, addition of a small amount of norvaline to the solution causes a disklike deposit of copper to grow outwardly from the cathode and along the air‐solution interface. Experiments show that this phenomenon is due mainly to a solid reaction product arising from air oxidation of the norvaline along the line of contact between the copper anode, air, and solution. This solid, presumably present in a highly subdivided state, migrates by surface diffusion from the anode to the cathode along the air‐liquid interface, giving rise to nucleation sites that lead to the interfacial cathode growth. The mechanism is thought to involve a conductive surface film containing copper powder as a conducting medium. The rate of disk formation depends on the concentration of the norvaline, the area of anode surface along the air‐solution interface, the acidity of the solution, the partial pressure of oxygen above the solution, and the rate of current flow. It does not depend very markedly on the concentration of the copper sulfate.
A B S T R A C TA metallographic examination was made of a cathode deposit formed along the air-solution interface of an acid copper sulfate electrolyte containing a small amount of norvaline. The photomicrographs indicate initial nucleation at the interface, presumably along a preexisting conductive film, followed by growth of the deposit downward toward the solution. No evidence was found of growth cones extending radially and horizontally from the cathode and along the interface.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 132.239.1.231 Downloaded on 2015-06-07 to IP
Bei der Elektrolyse einer angesäuerten Cu‐sulfatlösung mit einer Cu‐Drahtkathode , die von einer zylindrischen Cu‐Anode umgeben ist, bildet sich bei Zugabe geringer Mengen Norvalin zu der Lösung eine scheibenförmige Cu‐Abscheidung außen an der Kathode längs der Grenzfläche Luft‐Lösung.
Die in vorstehendem Referat beschriebene kathodische Abscheidung längs der Grenzfläche Luft‐Lösung in einem sauren Cu‐sulfatelektrolyten, der geringe Mengen Norvalin enthält, wird metallographisch untersucht.
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