08198 Corrosivity Mapping of the Pacific Theater of Operations

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Product Number: 51300-08198-SG

ISBN: 08198 2008 CP

Author: George A. Hawthorn and Lloyd H. Hihara

Publication Date: 2008

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Forty portable exposure racks (PERs) were designed and built to expose thirteen metals and alloys for a period of one year on the island of Oahu, Hawai‘i. Racks were designed to support thirty nine test specimens (three per metal or alloy) as well as instrumentation to monitor temperature, humidity, time-of-wetness, chloride deposition rate and sulfur deposition rate. During the initial phase of the project, six PERs were deployed for six months on Oahu. Between February and August of 2007, thirty seven PERs were deployed at thirty five locations on Oahu. Most of the PERs were installed on Hawaiian Electric Company (HECO) utility poles. Corrosivity maps for four metals and corrosion rate maps for nine metals and alloys were generated for Oahu based on an initial six month exposure at six locations. In a separate study, wet chloride candles, dry chloride candles and pure silver coupons were exposed at a marine site on Oahu. The results, which will help interpret chloride deposition data from the PER experiment, indicated that dry chloride candles could be used to compare chloride deposition rates at different sites where long exposures are expected. Chloride deposition rates derived from coulometric reduction of pure silver coupons exposed at a marine site did not agree with monthly wet chloride candle data collected at the same site.