Document Type : Research Paper
MSc. Materials Engineering, Univ. of Babylon, Iraq.
Dept. of Metallurgical Engineering, Materials Engineering Faculty, Univ. of Babylon, Iraq.
Metal-based dental alloy is one of the most widely used materials in dentistry. Alloys of Cobalt-chromium and nickel-chromium have many applications in the field of dentistry besides alloys Gold and precious metals used in this field.Nickel-chromium alloys are common in dental prosthetic applications because they are more economical than gold alloys. In this paper, the effect of adding zirconium on corrosion behavior of a nickel-chromium- molybdenum alloy was studied in saliva solution. Zirconium was added in three percentages (0.4, 0.8, 1.2) %. The alloy was prepared by powder metallurgy method (PM). Open circuit potential, electrochemical, scanning electronic microscope (SEM), and X-ray diffraction tests and inspections were used. The results proved that the addition of zirconium led to an improvement in corrosion resistance by about 81% in (NiCrMo+0.8Zr) alloy compared to the base alloy without the addition of zirconium. The presence of zirconium in the alloy resulted in a refining of the grain size, which improves the properties of the alloy.