title: [Study on corrosion resistance of three non-noble porcelain alloys].
abstract: OBJECTIVE
  To study the electrochemical corrosion behavior of Co-Cr, Ni-Cr and Ni-Cr-Be based porcelain alloys in NaCl solution.
  
  
  METHODS
  Five samples of each alloy were made respectively, electric polarization curve of each alloy was obtained using potentiodynamic polarization technique. Self-corrosion potential (E(corr)), self-corrosion current density (I(corr), passive region and transpassivation potential were tested. Microstructure and constituent was examined using scanning electron microscopy and energy dispersive spectroscopy.
  
  
  RESULTS
  Co-Cr alloy possessed the most desirable corrosion resistance because of its integrated, homogeneous and compact passive film. The poor compactness of Ni-Cr alloy's passive film decreased its corrosion resistance. Ni-Cr-Be alloy exhibited the worst corrosion resistance due to the Cr and Mo depleted Ni-Be eutectic phases in the alloy.
  
  
  CONCLUSIONS
  Taking biological security into consideration, it is necessary to avoid the application of porcelain alloys with Be element. Co-Cr alloy with better biocompatibility possesses much broader prospect in the field of dental restoration.
authors.affiliation: School of Manufacturing Science and Engineering, Sichuan University, Chengdu 610059, China.
authors.forename: Zhikai
authors.initials: Z
authors.lastname: Wu
authors.forename: Sheng
authors.initials: S
authors.lastname: Xu
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Jin
authors.initials: J
authors.lastname: Teng
authors.forename: Ning
authors.initials: N
authors.lastname: Li
mesh_terms: D000497:Alloys; D002858:Chromium Alloys; D003343:Corrosion; D003722:Dental Alloys; D003776:Dental Porcelain; D008855:Microscopy, Electron, Scanning; D009532:Nickel; D013499:Surface Properties
chemical_list: D000497:Alloys; D002858:Chromium Alloys; D003722:Dental Alloys; C403005:nickel-chromium-beryllium alloy; D003776:Dental Porcelain; D009532:Nickel