Abstract
Localized corrosion, such as pitting, crevice, and under-deposit corrosion, is often the main factor in determining the service life of equipment in industrial water systems. Because of the complexity and dynamic nature of industrial operations, as well as lack of effective monitoring tools, little is known about the impact of variations in process conditions and water chemistry on localized corrosion. As a result, premature equipment failures occur, in spite of the use of relatively large design safety factors. Differential flow cell method is developed to address this issue. The differential flow cell method is designed primarily for online and real-time measurement of the rates of localized corrosion of metals used in industrial water systems. A detailed discussion of the principles of the method, the localized corrosion rate calculation methods, typical flow cell and electrical instrument assembly design, verification of the results by other independent known measurement methods, and guidance on data interpretation are provided.
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