TY - JOUR
T1 - The effect of beryllium on the corrosion resistance of nickel-chromium dental alloys
AU - Cheng, Tzyy Ping
AU - Tsai, Wen Ta
AU - Lin, Jiin Huey Chern
AU - Lee, Ju Tung
PY - 1990/11
Y1 - 1990/11
N2 - Base-metal alloys of the nickel-chromium system are widely applied in fixed prosthodontics. The principal purpose of the addition of beryllium is to increase the fluidity of the Ni-Cr alloy during melting and increase the castability. In this study the effects of beryllium addition, by weight percentages of 0.5, 1.0 and 2.0, respectively, on the microstructure and corrosion resistance of seven Ni-Cr-based and NP2-based dental alloys were examined in Ringer's solution at 37°C. The experimental results indicate that addition of beryllium has a very significant effect on lowering the pitting potentials, open-circuit potentials, passive-film resistances and, on the contrary, increasing the passive-film capacitances. The presence of beryllium greatly reduces the thickness of the passive film and makes the corrosion resistance worse. This effect is more pronounced for NP2-based dental alloys. Examination of the corroded surfaces reveals that it is the Ni-Be eutectic phase being preferentially attacked.
AB - Base-metal alloys of the nickel-chromium system are widely applied in fixed prosthodontics. The principal purpose of the addition of beryllium is to increase the fluidity of the Ni-Cr alloy during melting and increase the castability. In this study the effects of beryllium addition, by weight percentages of 0.5, 1.0 and 2.0, respectively, on the microstructure and corrosion resistance of seven Ni-Cr-based and NP2-based dental alloys were examined in Ringer's solution at 37°C. The experimental results indicate that addition of beryllium has a very significant effect on lowering the pitting potentials, open-circuit potentials, passive-film resistances and, on the contrary, increasing the passive-film capacitances. The presence of beryllium greatly reduces the thickness of the passive film and makes the corrosion resistance worse. This effect is more pronounced for NP2-based dental alloys. Examination of the corroded surfaces reveals that it is the Ni-Be eutectic phase being preferentially attacked.
UR - http://www.scopus.com/inward/record.url?scp=0025513447&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0025513447&partnerID=8YFLogxK
U2 - 10.1007/BF00701079
DO - 10.1007/BF00701079
M3 - Article
AN - SCOPUS:0025513447
SN - 0957-4530
VL - 1
SP - 211
EP - 218
JO - Journal of Materials Science: Materials in Medicine
JF - Journal of Materials Science: Materials in Medicine
IS - 4
ER -