MICROPLASMA OXIDATION OF AN ALUMINUM-ALLOY IN AQUEOUS-SOLUTIONS CONTAINING SODIUM CYCLOHEXAPHOSPHATE AND NITRATES OF LANTHANUM AND EUROPIUM

The relationship between the ionic composition of electrolytes and the element and phase composition of anodic films produced in them is stu died by the P-31 NMR spectroscopy, laser mass spectrometry, and X-ray diffractometry. The simultaneous and proportional incorporation of Ln and P into the films in the course of microplasma oxidation is determi ned by the presence of the polyphosphate-ln complex anions in the elec trolyte. The average P/Ln ratios tin at. %) in the films is close to t hree. The assumption is made that, in addition to phases of Al2O3, ano dic films contain chain polyphosphates Ln(PO3)(3), metaphosphate glass es Ln(2)O(3) . 3P(2)O(5), or their mixtures. General features of the i nfluence exerted by complex anions, consisting of a polyphosphate and either divalent or trivalent cations, on the composition and formation of anodic films, are discussed.