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Electrochemical Impedance Spectroscopy (EIS) and Thermal Wave Imaging (TWI) are complementary techniques which can be used to detect and estimate Impact Induced Corrosion (IIC) at the metal-polymer interface. This paper describes the use of the above techniques to detect Impact Induced Corrosion in a variety of pre-coated and painted sheet steels. It has been possible to show, that IIC is a threshold phenomenon and depends on the type of galvanized coating. Evaluation of IIC, using a high performance indoor accelerated test and preliminary data from the proving grounds are presented in this paper.

Automotive car bodies are subject to impact damage by stones lofted by front tires or from passing vehicles. Velocities of stone impact can reach values much higher than the moving automobile. Stone impact damage can result in paint loss and a possible corrosion problem due to damage at the metal-polymer interface. This work describes the application of several complementary techniques to evaluate impact damage. These techniques include Electrochemical Impedance Spectroscopy (EIS), Thermal Wave Imaging (TWI) and Acoustic Microscopy (AM) The advantages offered by each technique are discussed.