Traditionally, closed system treatment programs have involved adding corrosion inhibitor and
periodically testing for the residual. To be effective, these treatment programs must also
include cleaning. This paper will discuss the various aspects that should be evaluated as part of a closed system treatment program.
If the iron concentration in an alkaline chelant boiler cleaning solution reaches a high value when dissolving magnetite, it sometimes continues to increase rapidly and not level, indicating corrosion of the boiler metal. A laboratory study of “runaway iron increases” investigated the cause and the best mitigation methods.
This guide covers and describes the factors that influence laboratory immersion corrosion tests, particularly mass loss tests. These factors include apparatus, sampling, test specimen, test conditions (test solution composition, temperature, gas sparging, fluid motion, solution volume, method of supporting test specimens, duration of test), methods of cleaning test specimens, imterpretation of results, and calulation of corrosion rates. This guide also emplasizes the importance of recording all pertinent data and provides a checklist for reporting test data.