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The human body is a problematic environment for many metals and alloys because
of the risk of corrosion [1]. This risk increases as the pH of the environment decreases [2].
Changes in body fluid pH are observed soon after implantation due to the induction of
inflammatory response [3]. Local pH value may drop to approx. 5.4-5.5 in inflamed tissue and
even to 4.7 in fracture-related hematoma [4,5]. More significant acidification of
microenvironment may appear locally within the attachment zone of activated macrophages (up
to pH = 3.6-3.7) and osteoclasts, cells which are crucial for bone remodeling process (pH = 3.0
or less) [6]. The issue of corrosion resistance is particularly important under conditions of
tribological contact with other parts of the body [7]. The purpose of this study was to evaluate
the corrosion resistance of Ti6Al7Nb titanium alloy after laser surface treatment. Laser-
generated point surface defects with coverage levels of 10, 30 and 50% and depths of 5.0, 41.5
and 78.0 μm were produced on the samples. Corrosion tests were carried out by
potentiodynamic method in Ringer's solution buffered to pH 7.4 and 5.5, simulating the body's
neutral state and inflammation, respectively. An increase in corrosion current and corrosion
potential was observed with a decrease in pH
