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The incubation in artificial sweat produced changes of the surface that were studied by means of parallel beam XRD, scanning electron microscopy (SEM) and X-ray photoemission spectroscopy (XPS).
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The pH was adjusted to 6.5 by adding an aqueous solution of ammonia.
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The composition of the artificial sweat was 0.5% NaCl, 0.1 % lactic acid and 0.1 % urea. The surface structure of the as quenched ribbons was determined by parallel beam X ray diffraction (parallel beam XRD) and the presence of a single amorphous phase was evidenced for all samples.Īn incubation in artificial sweat was carried out for 7 days at 30 degrees C, following the European Standard EN 1811. In this work, structural changes of the surface of amorphous gold based alloys were studied after corrosion resistance tests in order to relate surface morphology to tarnishing of these materials.Īu gold alloys showing a large glass forming ability (Au(44)Cu(36)Ti(2)Si(18), Au(44)Cu(37)Ti(1)Si(18), Au(42)Cu(29)Ti(8)Si(21), Au(49)Cu(26.9)Ag(5.5)Pd(2.3)Si(16.3)) were produced in ribbon form by melt spinning. Bulk glassy alloys display an increased corrosion resistance and improved mechanical properties with respect to the conventional crystalline alloys. Au based multicomponent alloys was recently discovered, showing a large glass forming ability, so that bulk amorphous materials can he obtained by copper mould casting.