Abstract: Abstract:Objective  To study the electrochemical corrosion of Ni-Cr alloy,Co-Cr alloy and pure titanium(Ti) in Cola,and to provide  basis for choice of clinical materials.Methods Ni-Cr alloy,Co-Cr alloy and pure Ti were divided into 3 groups.The classic three-electrode system was used to measure thecorrosion potential (Ecorr) and polarization curves,the polarization resistance (Rp),and corrosion current density (Icorr)  in three groups in artificial saliva and Cola,and the results were analyzed by statistics.Results  The values of Ecorr and Rp of Ni-Cr alloy,Co-Cr alloy and pure Ti in Cola were lower than those in artificial saliva(P<0.05),and the values of Icorr of them in Cola were higher than those in artificial saliva(P<0.05). In Cola,the values of Ecorr and Rp were Ni-Cr alloy＜Co-Cr alloy

Key words: dental alloy, artificial saliva, Cola, electrochemical corrosion