Effect of Mutans Streptococcus on Corrosion Resistance of Ni-Cr Alloy
- VernacularTitle:变形链球菌对镍铬合金耐蚀性能的影响
- Author:
bin, HU
;
fu-qiang, ZHANG
- Publication Type:Journal Article
- Keywords:
Ni-Cr alloy;
polarization curve;
X-ray photoelectron spectroscopy;
corrosion resistance;
Mutans Streptococcus
- From:Journal of Shanghai Jiaotong University(Medical Science)
2006;0(10):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the effect of Mutans Streptococcus(S.Mutans) on the corrosion resistance of Ni-Cr alloy. Methods S.Mutans were isolated in TSB,and then 10~(5)10~6 CFU/mL of bacterial population was reached.The self-corrosion electrical current density and the corrosion electrical current potential of Ni-Cr alloy were found from polarization curves under the condition with or without media plus S.Mutans.The surface of Ni-Cr alloy after bacterial corrosion was examined with X-ray photoelectron spectroscopy(XPS) to find out different element contents.(Results)From polarization curves,it could be found that the self-corrosion electrical current density and the corrosion electrical current potential of Ni-Cr alloy without S.Mutans were 53.5 ?A/cm~(2)and-62 mV,and those with S.Mutans were 75.7 ?A/cm~(2)and-220 mV.Examination of XPS showed that besides Ni and Cr,the element of chlorine(Cl),sulphur(S),calcium(Ca) could be found on the surface of Ni-Cr alloy after bacterial corrosion.(Conclusion Because of) the metabolism of S.Mutans,an oxide film could be destroyed and a biofilm be formed on the surface of Ni-Cr alloy.Bacterial corrosion could lower the corrosion resistance performance of Ni-Cr alloy.
