The corrosion resistance of Wiron®88, a Ni–Cr–Mo alloy, was evaluated in liquid growth media in the
absence and presence of the Streptococcus sobrinus and
Streptococcus mutans strains. Open circuit potential measurements,
cyclic voltammetry, linear sweep voltammetry,
as well as electronic microscopy coupled to electron diffraction
spectroscopy (SEM/EDS), were the main techniques
used in this study. It was concluded that the
presence of S. sobrinus and S. mutans have only a slight
effect on the corrosion resistance of the Wiron®88 alloy,
with the S. mutans being slightly more aggressive. For both
strains the corrosion resistance Rp is of the same order (kohm
cm2). After 24 h immersion the S. sobrinus lead to and Rp
of 11.02, while the S. mutans lead to of 5.59 kohm cm2.
SEM/EDS studies on the Wiron®88 samples, with 24 days
of immersion, at 37 C, have confirmed bio-corrosion of
the alloy occurring through the dissolution of Ni as Ni2+ and formation of chromium and molybdenum oxides. The
bacterial adhesion to the surface is not uniform
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