Passivation of rhodium in hydrochloric acid solutions

✍ Scribed by J. Llopis; M. Vázquez

• Publisher: Elsevier Science
• Year: 1964
• Tongue: English
• Weight: 560 KB
• Volume: 9
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(64)80092-x

✦ Synopsis

Conclusions about the passivation of rhodium have been obtained by studying the anodic and cathodic charging curves with solutions of HCIOl and/or HCl as electrolytes. The electrochemical surface. oxidation of rhodium causes passivation. In HClO, solutions this oxidation leads to the formation of monomolecular films of Rh,O, and/or RhOa, according to the polarizing potential. In solutions of HCl only the formation of RhaOI and adsorbed Cl atoms takes place. R&some-On interprete les particularites de la passivation de Rh au moyen des courbes de charge anodique et cathodique avec des solutions de HClO, et/au HCl comme electrolytes. L'oxydation electrochimique de la surface confere une passivation. En solution HClO&, il se produit des films monomoleculaires de RhaOs et/au RhOa, selon la tension polarisante. En solution HCI, il ne se forme que Rh108, avec adsorption d'atomes Cl. Zusammenfassung-Aufschliisse iiber die Passivitlt von Rhodium konnten durch Auswertung der anodischen und kathodischen Ladekurven in Losungen von HCIOr und/oder HCl erhalten werden. Die elektrochemische Oxydation der Rhodium-O#erfliiche ist fur die Passivitat verantwortlich.

In HClO,