Influence of Manufacturing Parameters on Microstructure Evolution and Corrosion Resistance of Powder Metallurgy Titanium

The influence of manufacturing parameters (particle size fractions of powder, compaction pressure, sintering temperature) of titanium hydride TiH2 on the microstructural evolution and corrosion resistance of porous titanium in inorganic acids (20 wt.% HCl and 40 wt.% H2SO4 solutions) was investigated. It was shown that the porosity was fixed in the powder metallurgy titanium regardless of the manufacturing parameters. By decreasing particle size fractions of powder (from 100-200 mu m to 0-100 mu m) and increasing compaction pressure (from 150 MPa to 650 MPa) and sintering temperature (from 1050 & DEG;C to 1350 & DEG;C), the porosity of titanium was decreased from 5.1% to 1.1%. It was determined that a decrease of the porosity improves the anticorrosion properties of sintered titanium investigated by potentiodynamic polarization and static immersion tests. The highest corrosion resistance in the inorganic acids was obtained for porous titanium (1% porosity), which was pressed at 650 MPa and sintered in a vacuum at a temperature of 1350?.