Biomedical Engineering Reference
In-Depth Information
atmosphere; or can be estimated in fast electrochemical method,
where the corrosion current relects the corrosion rate of the
material. In the electrochemical method, a polarization curve of the
material immersed in the corrosive electrolyte is drawn (Fig. 5.5).
On the basis of the Tafel tangents, intersection is given a corrosion
current and corrosion potential. In the passive range of the corrosion
curve, the current density indicates the tendency of passivation and
at higher potentials the tendency of pitting corrosion. Generally the
lower current densities indicate the higher corrosion resistance.
Figure 5.3 SEM image showing morphology of pitting attack after cyclic
potentiodynamic polarization testing of Ti Grade 2 in deaerated
1M NaCl at 95 °C [2].
Figure 5.4 SEM image of crevice corrosion on Ti Grade 2 after polarization
at 0 V SCE in 1M chloride at 95 °C [2].
 
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