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Abstract

Sintered stainless steels of types similar to AISI 304L and 316L were produced in a laboratory furnace at two different temperatures (1150 and 1250°C). Electrolytic copper and prealloyed bronze were added in different concentrations up to 200%and the effect of alloying concentrations and sintering temperature on the corrosion resistance of the steels was studied. The corrosion behaviour was characterised by immersion in three different acids (H₂SO₄, HCl, and HNO₃) at room temperature and by electrochemical reactivation tests. Both copper and bronze experienced improved corrosion resistance in HCl, small copper additions (4 and 8%) had a positive effect in H₂SO₄, but alloyed stainless steels showed worse corrosion behaviour than unalloyed ones in HNO₃. The electrochemical reactivation tests showed a tendency towards passivity.

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Corrosion resistance of alloyed powder metallurgy austenitic stainless steels in acid solutions

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