CORROSION-RESISTANCE OF TITANIUM PLATINUM ALLOY PREPARED BY SPARK PLASMA SINTERING

The microstructure and corrosion resistance of Ti-Pt alloys prepared from Ti and Pt powders by the Spark Plasma Sintering (SPS) method was investigated. The microstructure of SPS's specimens were observed by scanning electron micrographs and X-ray diffraction patterns. Pt phases were dispersed in the Ti matrix, and a few intermetallic compounds of Ti-Pt were formed around the Pt phases. The corrosion behavior of SPS's specimens were evaluated by potentiostatic polarization measurement in a 5 mass%HCl solution. The Pt and Ti3Pt phases may be responsible for high corrosion resistance, and the cathode reaction on Pt phases keeps passive state Ti. Therefore, the Ti matrix becomes appreciably more passive compared with the are melted Ti-Pt alloys. In this method, the corrosion resistance was improved by adding only a few mass% of Pt.