Effect of aurum coating on corrosion resistance of Ni-Cr alloy.
- Author:
Zhi-hong CHEN
1
;
Li LIU
;
Ying-jie MAO
Author Information
- Publication Type:Journal Article
- MeSH: Chromium Alloys; chemistry; Corrosion; Electrochemistry; Gold Alloys; chemistry; Metal Ceramic Alloys; chemistry; Microscopy, Electron, Scanning; Nickel; chemistry; Saliva, Artificial; chemistry; Surface Properties
- From: Chinese Journal of Stomatology 2007;42(2):118-121
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo evaluate the effect of aurum coating on corrosion resistance of Ni-Cr alloy in artificial saliva environment.
METHODSThe corrosion potential (E(corr)), self-corrosion current density (I(corr)), and polarization resistance (R(p)) of three alloys were measured using electrochemical methods to compare the difference of corrosion resistance between aurum-coated Ni-Cr alloy and Ni-Cr alloy or Au alloy. Meanwhile, microstructural and phase diffraction was examined with field scanning electromicroscopy (FSEM) and surface chemical analysis was performed by energy diffraction X-ray (EDX).
RESULTSThe I(corr) of aurum-coated Ni-Cr alloy was (0.70 +/- 0.20) x 10(-6) A/cm2, which was significantly higher than that of Au alloy (P < 0.05) and lower than that of Ni-Cr alloy (P < 0.05). R(p) of aurum-coated Ni-Cr alloy was (34.77 +/- 12.61) KOmega.cm2, which was higher than that of Ni-Cr alloy (P < 0.05) and lower than that of Au alloy (P < 0.05). The results of FSEM showed that the corrosion resistance of Ni-Cr alloy coated with aurum was better than that of Ni-Cr alloy. The results of EDX indicated that released Ni and Cr of Ni-Cr alloy coated with aurum after test were less than those of Ni-Cr alloy (P < 0.05).
CONCLUSIONSThe corrosion resistance of aurum-coated Ni-Cr alloy is higher than that of Ni-Cr alloy.
