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97553 FIELD TESTING OF VAPOR PHASE CORROSION INHIBITORS AND DEHUMIDIFICATION AS CORROSION CONTROL METHODS FOR ADVANCED DOUBLE HULL NAVAL SHIPS

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Product Number: 51300-97553-SG
ISBN: 97553 1997 CP
Author: R. Simmons, C. Bowles, A. Sheetz, H. Hack, K. L. Vasanth
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The effectiveness of two commercially available vapor phase corrosion inhibitors (VCIS) and one industrial desiccant wheel (DEW) dehumidifier are evaluated for the corrosion protection of advanced double hull (ADH) compartments on naval ships. Small-scale ADH compartments were constructed to simulate the environmental conditions likely to be encountered in service. The three simulated environments of interest were (1) air filled, sealed compartments, (2) compartments with a leak allowing humid air ingress, and (3) compartments with a seawater spill or leak. Commercial grade steel weight loss coupons and galvanic couples of steel copper-nickel 90-10 (UNS C70600) , steel/stainless steel 304 (UNS S30400), and steel/aluminum alloy 6061- T6 (UNS A96061) were installed in each box, along with atmospheric corrosion probes, thermocouples, and relative humidity probes. The test chambers were exposed to the marine environment on test racks located approximately 200 feet from the ocean in Dania, Florida. Six and 12 month weight loss, corrosion rate, temperature and humidity data are presented along with visual observations. Of the three corrosion control methods under test, the dehumidifier is providing the best environmental and corrosion control. The VCIS show promise unable to provide long-term protection under the severe air leak and seawater spill/leak test conditions. Keywords: vapor phase corrosion inhibitors, corrosion inhibitors, inhibitors, dehumidification, DEW dehumidifier, advanced double hull, atmospheric corrosion, steel
The effectiveness of two commercially available vapor phase corrosion inhibitors (VCIS) and one industrial desiccant wheel (DEW) dehumidifier are evaluated for the corrosion protection of advanced double hull (ADH) compartments on naval ships. Small-scale ADH compartments were constructed to simulate the environmental conditions likely to be encountered in service. The three simulated environments of interest were (1) air filled, sealed compartments, (2) compartments with a leak allowing humid air ingress, and (3) compartments with a seawater spill or leak. Commercial grade steel weight loss coupons and galvanic couples of steel copper-nickel 90-10 (UNS C70600) , steel/stainless steel 304 (UNS S30400), and steel/aluminum alloy 6061- T6 (UNS A96061) were installed in each box, along with atmospheric corrosion probes, thermocouples, and relative humidity probes. The test chambers were exposed to the marine environment on test racks located approximately 200 feet from the ocean in Dania, Florida. Six and 12 month weight loss, corrosion rate, temperature and humidity data are presented along with visual observations. Of the three corrosion control methods under test, the dehumidifier is providing the best environmental and corrosion control. The VCIS show promise unable to provide long-term protection under the severe air leak and seawater spill/leak test conditions. Keywords: vapor phase corrosion inhibitors, corrosion inhibitors, inhibitors, dehumidification, DEW dehumidifier, advanced double hull, atmospheric corrosion, steel
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