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Transizione da codeposizione anomala a normale nell’elettrodeposizione di leghe zinco-nichel.
No full textInfluence ofchromatation and heat treatment on corrosion resistance of zinc-nickel alloy coatings.
No full textInfluence of chromatation and heat treatments on corrosion resistance of zinc-nickel alloy coatings.
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Corrosion fatigue characterisation of sintered multiphase stainless steels
No full textMultiphase stainless steels are produced for their attractive properties of mechanical strength and corrosion resistance relative to their austenite-ferrite structure. The manufacture of these steel by powder metallurgy technology presents some advantages in terms of low cost and formability of complex shapes. Mechanical and corrosion resistances are not at the level of the wrought steels due to their porous nature. In this work the fatigue and corrosion fatigue behaviour of some sintered steels obtained by sintering from 316L and 434L base powders has been studied for characterisation and comparison. The sintered steels were fatigue tested in two different environments: air and NaCl aqueous solution. The tests performed indicate that the chemical and microstructral composition has no great influence on fatigue behaviour in comparison with the manufacturing technology (sintering). This is most evident in the more aggressive environment, like seawater, in which these steels could be advantageously used. The analysis of fracture surfaces using SEM microscopy shows a peculiar crack propagation characterised by cleavage, stress intensification due to porosity, and features of localised ductility on sintering necks and base powder particles
Influenza della cromatazione sulle caratteristiche morfologiche e di resistenza alla corrosione di elettrodepositi di lega zinco- nichel
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