An in-situ corrosion sensor facilitates coating development and screening b
y detecting the early stages of corrosion well before degradation is visibl
e. Based on electrochemical impedance spectroscopy (EIS), the sensor extend
s the use of this established laboratory technique from immersion only to d
ifferent accelerated test conditions (such as salt fog or humidity) and amb
ient service environments. By enabling a direct quantitative comparison of
the early stages of coating deterioration and substrate corrosion that occu
r in laboratory accelerated tests and service or field conditions, the labo
ratory tests can be validated and coatings screened more quickly.