[Electrochemical corrosion characteristics of Ni-Cr alloy in artificial saliva].
OBJECTIVE
The aim of this study is to determine the electrochemical corrosion characteristics of Ni-Cr alloys in vitro.


METHODS
The electrochemical corrosion behavior of Ni-Cr alloys was studied by polarization curves in artificial saliva at 36.5 degrees C (pH = 7.0) to measure the corrosion potential and self-corrosion current density. With X-ray photoelectron spectroscopy, the element content was analyzed.


RESULTS
It was found that the dot corrosion voltage of Ni-Cr was -390 mv, and passivation voltage -160 mv. The area of active dissolvation was from -160 mv to -270 mv. The self-corrosion current density is 0.262 micro Acm(-2). From XPS, the content of Ni, Cr, Mo, Fe was increasing gradually, and the content of O, C was decreasing gradually. The content of Ca decreased because Ca existed in the artificial saliva.


CONCLUSIONS
After polarization curve test, Ni-Cr alloy would occur corrosive reaction, and the corrosion product would attach to the surface of the material.
Hu
Bin
B
Department of Prosthodontics, School of Stomatology, Shanghai Second Medical University, Shanghai 200011, China.
Zhang
Fu-qiang
FQ
D002858:Chromium Alloys / Q000737:chemistry*; D003343:Corrosion; D004563:Electrochemistry; D066298:In Vitro Techniques; D009532:Nickel / Q000737:chemistry; D012464:Saliva, Artificial / Q000737:chemistry*
D002858:Chromium Alloys; D012464:Saliva, Artificial; D009532:Nickel