10165 Corrosion Monitoring in Dehumidified Storage Facilities

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Product Number: 51300-10165-SG

ISBN: 10165 2010 CP

Author: Elizabeth Trillo and Leonardo Caseres

Publication Date: 2010

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Dehumidified storage areas are designed to eliminate moisture and thereby corrosion damage. The goal of a dehumidified storage system is to keep the relative humidity (RH) below a certain level (75%) whereby the adverse effects of humidity (rust, condensation, mold and mildew) are greatly reduced or eliminated. In this study, monitoring sensors were placed inside storage facilities with and without a dehumidification system. The corrosion behavior, temperature and relative humidity were measured using a multielectrode array sensor (MAS) and coating degradation sensor (CDS) systems and compared to conditions that were outside the storage facility. The results of the program show that, the relative humidity was low both inside a thermal insulated storage facility (without dehumidification) and inside a tensioned fabric shelter (with dehumidification). Low corrosion rates were observed inside the thermal insulated storage building without dehumidification. In addition, the impedance values were high (potential for corrosion was low) for the tensioned fabric shelter with dehumidification. The RH and corrosion rates were highest in the outside condition (open lot) environment. Corrosion monitoring systems thus assist in identifying conditions where corrosion is most likely to occur as well as determine where dehumidification systems are necessary or not, thereby improving operational costs.

Keywords: Dehumidified storage, multielectrode array sensor, corrosion monitoring, coating degradation sensor