The barrier properties of coatings are
vitally important in the protection of metals against
corrosion. Water and ion ingression (e.g. Cl-), which
penetrate to the metal/coating interface, generate
electrochemically active sites and corrosion follows.
Presently various experimental techniques, such as
salt spray tests, are used to study corrosion protection
properties of coatings and to predict their performance.
However, most corrosion tests only provide a qualitative
estimation of the protective properties of coatings
without any information on the mechanism of
protection or failure. Electrochemical Impedance
Spectroscopy is widely used, not only to examine and
rank the corrosion protection performance of coatings,
but also to obtain important information on the kinetics
of coating degradation and corrosion activity
during exposure to a corrosive media. Localised
scanning methods like the Scanning Vibrating Electrode
Technique can be used to acquire localised
electrochemical details that cannot be obtained by
conventional techniques, which can shed yet more
light on coating performance. Although the above
techniques have all been used to investigate coatings,
correlation between the results has not been conducted
comprehensively. Uniscan M370微区扫描电化学工作站
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