Magnesium–Gold Alloy Formation by Underpotential Deposition of Magnesium onto Gold from Nitrate Melts

Metals

Vesna S. Cvetković¹  Jasmina S. Stevanović¹  Jovan N. Jovićević¹  Nataša M. Vukićević¹  Miomir G. Pavlović¹  Zoran Stevanović²  Niko Jovićević³ 

[1]Institute of Chemistry, Technology and Metallurgy, Department of Electrochemistry, University of Belgrade, Njegoševa 12, 110000 Belgrade, Serbia

[2]Mining and Metallurgy Institute Bor, Zeleni bulevar 35, 19210 Bor, Serbia

[3]Nissan Technical Center North America, Inc., 39001 Sunrise Drive, Farmington Hills, MI 48331-3487, USA

关键词: magnesium/gold alloys;    underpotential deposition;    magnesium nitrate melts;   

DOI  :  10.3390/met7030095

来源: DOAJ

【 摘 要 】

Magnesium underpotential deposition on gold electrodes from magnesium nitrate –ammonium nitrate melts has been investigated. Linear sweep voltammetry and potential step were used as electrochemical techniques. Scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD) were used for characterization of obtained electrode surfaces. It was observed that reduction processes of nitrate, nitrite and traces of water (when present), in the Mg underpotential range studied, proceeded simultaneously with magnesium underpotential deposition. There was no clear evidence of Mg/Au alloy formation induced by Mg UPD from the melt made from eutectic mixture [Mg(NO3)2·6H2O + NH4NO3·XH2O]. However, EDS and XRD analysis showed magnesium present in the gold substrate and four different Mg/Au alloys being formed as a result of magnesium underpotential deposition and interdiffusion between Mg deposit and Au substrate from the melt made of a nonaqueous [Mg(NO3)2 + NH4NO3] eutectic mixture at 460 K.

【 授权许可】

Unknown