The effect of noble alloying elements Ag, Pt and Au on the corrosion behavior of sintered stainless steel in an H2SO4 environment

P. Peled, D. Itzhak

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Abstract

The effect of cathodically active noble alloying elements, Ag, Pt and Au on the environmental behavior of hot pressed and sintered stainless steel in H2SO4 environment was investigated. It was found that Ag additions slightly improve the corrosion resistance and remain as inclusions in the sintered stainless steel. Pt additions of about 2 wt% were found to be sufficient to preserve the passive state. High Pt content results in high tendency for breakdown of the passive layer, due to very high cathodic activity. Au additions strongly affect pore morphology by decreasing the density of the open pores, most probably due to liquid phase sintering. The samples containing Au additions of various concentrations exhibit clear anodic active-passive transition with a wide range of passivation. Samples containing 5 wt% Au remain passive.

Original languageEnglish
Pages (from-to)1019-1028
Number of pages10
JournalCorrosion Science
Volume28
Issue number10
DOIs
StatePublished - 1 Jan 1988

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