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Industry constantly seeks improved methods to evaluate protective coatings. In immersion service, protective coatings act to reduce electrochemical activity at the metal/coating interface. Tracking this activity via the use of segmented panel testing appears to offer additional insight into coating performance that may aid in coating design and predicting longer-term performance.
The -850 mV (CSE) criterion refers to the polarized pipeline potential that is free of any IR-drop. Different methods to obtain the polarized potential exist. Interruption of the CP current will cause the current, I, and thus the IR-drop to become zero and the remaining polarization immediately after the interruption is representative of the polarized potential of the pipeline.
Few things in life improve quality, decrease costs and reduce the environmental impact. With the proper technology, using steel grit to prepare steel structures for coating can accomplish this.