摘要
目的研究变形链球菌对镍铬合金耐蚀性能的影响。方法变形链球菌接种于TSB溶液，增菌活化，浓度达到10^5～10^6CFU／mL。经恒电位测量极化曲线得到镍铬合金在有或无变形链球菌条件下自腐蚀电流密度和腐蚀电位；运用X-射线光电子能谱技术（XPS），分析镍铬合金在电化学腐蚀后表面元素成分的变化。结果镍铬合金的自腐蚀电流密度和腐蚀电位，无菌条件下分别为53．5μA／cm^2和-62mV，变形链球菌存在条件下分别为75．7μA／cm^2和-220mV；XPS分析显示，细菌腐蚀使镍铬合金表面新增了氯、硫、钙等元素。结论变形链球的新陈代谢破坏了镍铬合金表面的氧化膜而形成生物膜，因此降低了材料的耐蚀性能。
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 μA/cm^2 and -62 mV, and those with S. Mutans were 75.7 μA/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.
出处
《上海交通大学学报（医学版）》
CAS
CSCD
北大核心
2006年第10期1093-1095,共3页
Journal of Shanghai Jiao tong University:Medical Science
基金
上海市教育发展基金(05-03)资助项目
关键词
镍铬合金
极化曲线
X-射线光电子能谱
耐蚀性能
变形链球菌
Ni-Cr alloy
polarization curve
X-ray photoelectron spectroscopy
corrosion resistance
Mutans Streptococcus
