Electrochemical corrosion characteristics of Ni-Cr alloy in artificial saliva.

Author: Bin HU ¹ ; Fu-qiang ZHANG
Author Information

1. Department of Prosthodontics, School of Stomatology, Shanghai Second Medical University, Shanghai 200011, China.
Publication Type:Journal Article
MeSH: Chromium Alloys; chemistry; Corrosion; Electrochemistry; In Vitro Techniques; Nickel; chemistry; Saliva, Artificial; chemistry
From: Chinese Journal of Stomatology 2003;38(2):140-142
CountryChina
Language:Chinese
Abstract:
OBJECTIVEThe aim of this study is to determine the electrochemical corrosion characteristics of Ni-Cr alloys in vitro.
METHODSThe 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.
RESULTSIt 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.
CONCLUSIONAfter polarization curve test, Ni-Cr alloy would occur corrosive reaction, and the corrosion product would attach to the surface of the material.