[Corrosiveness of Ti-Fe-Mo-Mn-Nb-Zr alloys in various pH lactic acids].
Variation in pH value of oral cavity circumstance causes decayed tooth. In this paper, corrosions of Ti-Fe-Mo-Mn-Nb-Zr dental alloys in various pH lactic acids were studied by immersion test. In the case of pH=4, which is an acidity slightly larger than that causes decayed tooth, Ti-Fe-Mo-Mn-Nb-Zr alloys are entirely corrosion-resistant, and the corrosion type is pitting. With the increase in acidity, the corrosion-resistance of Ti-Fe-Mo-Mn-Nb-Zr alloys deteriorates, and the corrosion type changes from pitting to intergranular corrosion. Fe ion is the most dissolved substance in impregnation, which means Fe goes against the corrosion-resistance of Ti alloys. Both results of thermodynamics calculation and X-ray photoelectron spectroscopy have shown that Mn2O3, Nb2O5 and TiO2 form oxide film on the surface of Ti-Fe-Mo-Mn-Nb-Zr alloys.
Yu
Sirong
S
College of Materials Science and Engineering, Jilin University, Changchun 130025, China.
Zhang
Xinping
X
He
Zhenming
Z
Liu
Yaohui
Y
D003343:Corrosion; D003722:Dental Alloys / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry; D019344:Lactic Acid / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry; D008982:Molybdenum / Q000737:chemistry; D009556:Niobium / Q000737:chemistry; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry
D003722:Dental Alloys; D009556:Niobium; D019344:Lactic Acid; D008345:Manganese; D008982:Molybdenum; D015040:Zirconium; D014025:Titanium; D007501:Iron