A fast automatic data acquisition (33KHz) and processing system has been developed to perform nondestructive measurements of corrosion rate using the Coulostatic method. We evaluated five organic coated steel samples in contact with NaCl 3.5% P/W and Sodium Citrate (pH 3.5). The results were compared with results obtained by salt spray test performed to ASTM B117 and DIN 50907. The corrosion rate was indirectly calculated from the intrinsic Metal Charge Transfer resistance of an equivalent second order series cell electrical circuit model, as determined by an algorithm based on the Two Slope method. We were able to measure resistances in the order of up to...
Keywords: Coating System, Corrosion, Coulostatic Nfethod, Two Slope Method, Data Acquisition, Data Processing, Software Algorithm, Organic Coat, Cell, High Impedance, Electrical Circuit Models.