Assessment and comparison of surface chemical composition and oxide layer modification upon two different activation methods on a CoCrMo alloy
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Document typeArticle
Defense date2014
Rights accessRestricted access - publisher's policy
Abstract
This study investigated the effect of two different
activation methods on the surface chemical composition of a
CoCrMo-alloy. The activation was performed with oxygen
plasma (OP) or nitric acid (NA). The surface physical–
chemical properties were thoroughly characterized by means
of several analytical techniques: X-ray photoelectron spec-
troscopy (XPS), time-of-flight secondary ion mass spec-
trometry (ToF-SIMS), zinc-complex substitution technique,
contact angle, and interferometry. The surface modification
was evaluated by assessing contamination removal, the
‘‘active’’ hydroxyl groups (OH-act) present at the surface, the
metal oxide ratio (Co
y
O
x
-
/Cr
y
O
x
-
) and changes in the chem-
ical composition and topography of the oxide layer. XPS
experimental data showed for both methods (OP and NA) a
significant decrease of the carbon contents (C 1
s
) associated
with contaminants and at the same time changes in the atomic
composition of the oxide layer (O 1
s
). In addition, the O
1
s
XPS spectra showed differences between the percentage of
OH
-
before and after OP or NA treatment, leading to the
conclusion that both methods are effective for surface
‘‘cleaning’’ and activation. These results were further inves-
tigated and corroborated by ToF-SIMS analysis and zinc
complex substitution technique. The general conclusion was
that NA is more efficient in terms of contaminants removal
and generation of accessible OH-act present at the surface and
without altering the native metal oxide ratio (Co
y
O
x
-
/Cr
y
O
x
-
)
considered to be essential for biocompatibility.
CitationParedes, V. [et al.]. Assessment and comparison of surface chemical composition and oxide layer modification upon two different activation methods on a CoCrMo alloy. "Journal of materials science. Materials in medicine", 2014, vol. 25, p. 311-320.
ISSN0957-4530
Publisher versionhttp://link.springer.com/article/10.1007%2Fs10856-013-5083-2
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