Abstract
Field signature method (FSM) is based on a potential drop (PD) technique and has been applied for nearly three decades for online metal pipe corrosion monitoring in many industrial areas. However, the detection precision of FSM for localized corrosion is still very low because the current field distribution in the measured pipe will be changed during the corrosion process but the formula used to assess corrosion-depth at present ignores the changes. This paper proposed an improved formula to calculate localized corrosion. The theoretical analysis and experimental results verified that the evaluation accuracy of FSM for localized corrosion can be greatly improved by this new formula.
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