Effect of Mo content and pH value on the corrosion behavior of Ni-20Cr-Mo dental alloys
Geis-Gerstorfer, J.; Greener, E.H.
Deutsche Zahnarztliche Zeitschrift 44(11): 863-866
1989
ISSN/ISBN: 0012-1029 PMID: 2639001 Document Number: 330958
The results showed that the resistance against pitting corrosion in an acid milieu was dramatically improved by increasing the Mo content, while in a neutral milieu the pitting potential Ep remained unchanged. Remarkably, a Mo-content of more than 6 wt. % resulted in a further reduction in the pitting corrosion potential Ep, when pH 2 has been exceeded. A similar behaviour has been observed with the critical pitting potential Ec: Ec is also reduced at pH values between 3 and 7. To avoid pitting corrosion in the clinically relevant pH range of 4 to 7, a pitting resistance equivalent (PRE) of at least 43 is required.