Abstract
AbstractThe aim of this work is the study of the electrochemical behaviour and corrosion resistance of copper alloyed vacuum sintered stainless steel. The presence of copper can improve the passivability of sintered stainless steel and, as a consequence, the corrosion resistance; moreover, vacuum sintering allows materials with good chemical and mechanical properties to be produced, avoiding the interaction between the metal and the sintering atmosphere. Microstructural characterization was carried out: copper evaporation during sintering and a different solubility of copper in AISI 304L and AISI 316L were indicated. This last result was related to the surface oxides stability of the steels in the sintering condition.The electrochemical characterization in an acid environment showed different behaviour as a function of the copper amount and of its presence as solid solution. These results were compared with similar measurements of wrought materials or samples sintered in a nitrogen‐containing atmosphere.
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