Platinised-iridium coated titanium electrodes for electrochemical applications

被引：0

作者：

Mudali, UK ^{[1
]}

Raju, VR ^{[1
]}

Dayal, RK ^{[1
]}

机构：

[1] Indira Gandhi Ctr Atom Res, Div Met, Aqueous Corros & Surface Studies Sect, Kalpakkam 603102, Tamil Nadu, India

来源：

CORROSION AND ITS CONTROLS, VOLS I AND II | 1998年

关键词：

D O I：

暂无

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Metallic coatings of Pt and Pt-Is were prepared by thermochemical glazing process on titanium substrates for application as electrodes in the electrolytic dissolution of spent nuclear fuels in a severe corrosive environment containing boiling nitric acid, uranium and other redox ions. Titanium substrates with single layer of RuO2-TiO2, applied with Pt and Pt-Ir chemical solutions, were heat treated in vaccum at different temperatures between 973 to 1473 K for 1 h. Electrochemical cathodic and anodic polarisation studies were carried out on these samples in 1M HNO3 at room temperature. Physical characterisation of these electrodes by SEM/EDAX, XRD and SIMS indicated that adherent, smooth metallic coatings of Pt-Ti, Pt-Ir and other intermetallic compounds of Ti, Pt and Ir were present on the surface. It was found that the specimens prepared at 1373 K showed better electrochemical performance in comparision with Pt sheet electrodes. Significant changes in the open circuit potential (OCP) and the polarisation behaviour of the electrodes prepared were noticed. Life assessment of these electrodes in a simulated reprocessing boiling nitric acid(10 N) test solution containing uranium and other redox ions showed excellent performance of the Pt-Ir layered electrode, prepared at 1373 K, in comparison with conventional MOCTA electrodes.

引用

页码：930 / 938

页数：9