[Corrosion resistance of Co-Cr, Ni-Cr, Ni-Cr-Ti alloy in artificial saliva].
OBJECTIVE
To evaluate the corrosion resistance of Co-Cr, Ni-Cr and Ni-Cr-Ti alloy in artificial saliva.


METHODS
Electrochemical methods were used to measure the self-corrosion potential (Ecorr), self-corrosion current density (Icorr) and polarization resistance (Rp) of three alloys .And the polarization curves of the three alloys were recorded too. One-way ANOVA with SPSS 11.0 software package was used for statistical analysis.


RESULTS
The Icorr of Co-Cr alloy was significantly lower than that of Ni-Cr alloy (P<0.05) and Ni-Cr-Ti alloy (P<0.05). The Icorr of Ni-Cr-Ti alloy was significantly lower than that of Ni-Cr alloy (P<0.05). The Rp of Co-Cr alloy was significantly higher than that of Ni-Cr alloy (P<0.05) and Ni-Cr-Ti alloy (P<0.05). The Rp of Ni-Cr-Ti alloy was significantly higher than that of Ni-Cr alloy(P<0.05). The Ecorr of Co-Cr alloy was significantly higher than that of Ni-Cr alloy (P<0.05) and Ni-Cr-Ti alloy (P<0.05).The Ecorr of Ni-Cr-Ti alloy was higher than that of Ni-Cr alloy but without significant difference(P>0.05).


CONCLUSIONS
The corrosion resistance of Co-Cr alloy is better than that of Ni-Cr and Ni-Cr-Ti alloy. The corrosion resistance of Ni-Cr-Ti alloy is worse than that of Ni-Cr alloy.
Sun
Ping
P
Affiliated Stomatological Hospital, College of Medical Science, Zhejiang University, Hangzhou 310006, Zhejiang Province, China. doctorsp@163.com
Lu
Ying
Y
Chen
Song
S
D000497:Alloys; D003343:Corrosion; D003722:Dental Alloys; D004563:Electrochemistry; D009532:Nickel; D012464:Saliva, Artificial; D014025:Titanium
D000497:Alloys; D003722:Dental Alloys; D012464:Saliva, Artificial; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium