An Application of Coulostatic Method for Rapid Evaluation of Metal Corrosion Rate in Solution

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Abstract
The coulostatic method was successfully applied to a rapid evaluation of metal corrosion rate in solution, where a known amount of small charge was supplied to the test piece, and the potential decay curve recorded was analyzed to obtain the corrosion rate. According to the theory developed, polarization resistances of mild steels in sulfuric acid and in distilled water were obtained, which agreed fairly well with resistances measured by usual methods. The coulostatic method developed in this study can be useful without ohmic drop correction, even in a high impedance solution. The time needed for measurement is considerably shorter, compared to the well‐known linear polarization method.

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