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Corrosion is a widespread and costly process. It is the ultimate end of life for most metal structures and costs businesses and economies billions of dollars.

Few methods of corrosion inhibition can be applied and then left unattended. Corrosion protection of engineering structures with selected coatings is commonly used worldwide but degradation of such coatings can occur leading to an underlying metallic corrosion problem. Successful long-term anti-corrosion measures require monitoring so that early problems may be detected and dealt with. Catastrophic failure can be avoided, which would otherwise lead to expensive replacement or loss of life. Some DC electrochemical techniques have already been applied in the evaluation process with only limited success. A field portable inspection unit applying Electrochemical Impedance Spectroscopy measurements, however, could provide a fast, non-destructive and quantitative method of assessing coating properties and identify the early onset of steel corrosion.