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1985 (1)
1981 (1)
1Author    Leopold Horner, Engelbert PliefkeRequires cookie*
 Title    Die Autoxidation von metallischem Kupfer und Kupfer(I)-Verbindungen Investigation on Autoxidation of Metallic Copper and Copper(I) Compounds by Different Methods  
 Abstract    The corrosion of copper granules under controlled conditions (2.5% NaCl solution, pH 4 buffer, Og) was studied using a) the rate of uptake of oxigen and b) the pH stat method. Cu 2+ ions catalyse the corrosion of copper. The surface area of the copper and the temperature influence the rate of corrosion in the expected manner. Experiments in light and dark showed little variation in the results. The results obtained by measuring the O2 uptake and using the pH stat method were confirmed and complemented by electrochemical measurements. (Steady potential/time curves, current/voltage curves, measurement of the polarisation resistance and estimation of Cu 2+ during corrosion via a Cu 2+ sensitive electrode.) The influence on the corrosion of F~, CI -, Br -and I~, mineral acid concentration and other inorganic ions was also studied under standard conditions. To ensure the correctness of the interpretation of the results (see reaction scheme), the autoxidation of CuCl and CU2O was also studied under standard conditions. The experimental results are consistent with the steps (l)-(4) in the reaction scheme. The fastest step is clearly the oxidation of Cu 1+ , which is continuously supplied via the copper surface. The interpretation here presented forms the basis for the understanding of the inhibition of corrosion exhibited by a number of organic compounds. 
  Reference    Z. Naturforsch. 36b, 713—720 (1981); eingegangen am 19. Dezember 1980 
  Published    1981 
  Keywords    Copper(I) Compounds, Autoxidation, Electrochemical Investigation 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0713.pdf 
 Identifier    ZNB-1981-36b-0713 
 Volume    36 
2Author    Leopold Horner, Christoph FranzRequires cookie*
 Title    Studien zum Vorgang der Wasserstoffübertragung, 75 [1] Elektrochemische Untersuchungen von S-und P-vergiftetem Raney-Nickel (Ra—Ni) und Versuche zu dessen Reaktivierung Studies on the Occurrence of Hydrogen Transfer, 75 [1] Electrochemical Investigation of Raney-Nickel (Ra—Ni) Poisoned with S and P and Experiments for the Reactivation  
 Abstract    Ra—Ni with an artificial rest potential of —1000 mV (vs SCE) is shifted with different rates to more positive values after the addition of thioethers and carbon disulfide. Only with Na 2 S-9H 2 0 a potential of —1100 mV (constant) is observed. Ra—Ni poisoned with sulfur is not reactivated neither cathodically nor anodically nor by the corrosive degradation at constant pH. Hydrogen structurally incorporated into the lattice of Ra—Ni (structural bonded hydrogen) is consumed by poisoning with thioethers and trivalent phosphorus compounds in a stoichiometric way. Ra—Ni-powder stepwise corrosively degradated up to 30% shows the same degree of desulfuri-zation as the original Ra—Ni. Desactivated Ra—Ni (loss of structural bonded hydrogen) is reacti-vated (56%) by cathodical treatment. In competing reactions the P—S, C—S, and C —P-bond in thiophosphinic esters, thioethers and trivalent P-compounds are hydrogenolyzed by Ra—Ni, the C—P-bond faster than the C—S-bond. 
  Reference    Z. Naturforsch. 40b, 814—821 (1985); eingegangen am 31. Januar 1985 
  Published    1985 
  Keywords    Structural Bonded Hydrogen, Hydrogen Transfer, Raney-Nickel, Electrochemical Investigation 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0814.pdf 
 Identifier    ZNB-1985-40b-0814 
 Volume    40