It has been shown that anodic oxidation of copper in alkaline solutions leads to a true passivation due to the formation of a protective layer. The properties of this layer depend on various factors such as current density, structure of the metal, electrolyte concentration and temperature.In all cases investigated in this paper, the primary product of anodic oxidation was cuprous oxide. But this cuprous compound is rapidly oxidised to cupric oxide or hydroxide which are the main constituents of the final film. The formation of cupric oxide is favored by decreasing the current density and raising the temperature. (*) These de doctorat : Bruxelles 1956. (**) Titulaire d'une bourse de spkcialisation de 1'l.R.S.I.A. (1) L. de BROUCKPRE, F. BOUILLON et Y .
RBSUMBLes auteurs demontrent par des methodes gravimktriques rigoureuses que la methode electrometrique est valable pour la determination de l'epaisseur des couches d'oxyde cuivreux et d'oxyde cuivrique formes sur le cuivre.
FezClgNz07H10, product of the reaction between Fes(CO)lz and C&5NCO, crystallizes in the space group P21/c with four molecules in a unit cell of dimensions a = 8.54, b = 13.25, c = 19.49 A, , B = 106.6". Thecrystal structure has been detemiined by three-dimensional X-ray diffraction methods (Weissenberg photographs, symbolic addition procedure, electron-density maps, least-squares refinement). The molecule is formed by association between CsH5-N-C(O)-N-CeH5 and (OC)3 Fe-Fe(CO)s: each N atom of the first part is linked to the two Fe atoms of the second.
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