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Corrosion resistance of a passivated and non‐passivated cobalt‐chromium alloy
Author(s) -
BRUNE DAG,
HULTQUIST GUNNAR,
LEYGRAF CHRISTOFFER
Publication year - 1984
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.1984.tb00890.x
Subject(s) - passivation , cobalt , chromium , corrosion , alloy , metallurgy , materials science , electrochemistry , nuclear chemistry , chemistry , electrode , composite material , layer (electronics)
– The release of cobalt and chromium from a passivated and non‐passivated cobalt‐chromium alloy in artificial saliva has been measured using nuclear tracer technique. The corrosion resistance of the passivated specimens was improved by a factor of about four compared to the non‐passivated specimens with regard to the initial cobalt release. The specimens were exposed to the saline solutions for periods up to about 8 wk. The cobalt release is associated mainly with electrochemical corrosion processes, since particulate matter retained on a filter was only registered to a minor extent. It is suggested that the decrease in release of cobalt and chromium after passivation is connected to the formation of Cr‐O and/or Cr‐OH bonds in the protective film which impede the movement of cobalt and chromium from the alloy into the saliva.