Abstract
Thermogravimetry (TG), energy dispersive X-ray microanalysis (EDX), scanning electron microscopy (SEM), mapping surface and X-ray diffraction (XRD) were used for the study of solid-state reaction on Pt-15%Rh with electrodeposited mercury. The results suggest when heated the mercury film react with the Pt-15%Rh alloy to form intermetallics having different thermal stabilities indicated by three mass loss steps. The first mass loss step occurs between room temperature and 184°C only the bulk Hg is removed and PtHg4, PtHg2 and RhHg2 were characterized by XRD. The second step, between 184 and 271°C, was attributed to PtHg4 decomposition with formation of PtHg2 stabilized by RhHg2. The third step, between 271 and 340°C, was attributed to decomposition of a solid-solution of PtHg2/RhHg2. The fourth step, between 340 and 600°C, was ascribed to: (1) a thermal decomposition of PtHg2, formed by a PtHg eutectoid reaction (∼340°C) on the surface and (2) Hg removal from a solid solution of Pt-15%Rh(Hg).
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