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Comparison Of Atmospheric Corrosion Of Silver Across Multiple Locations

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Atmospheric corrosion of bare metals is a constantly occurring process that can cause significant damage to metal components and structures. For this reason, it has been extensively studied, especially for steel and aluminum alloys.1-8 Environmental exposure testing is a common method for studying and characterizing the corrosion severity of a location, which allows for comparison with other regions. Much of this data collection is directed toward development of predictive models for corrosion processes, with the goal of estimating corrosion damage based on environmental conditions.

Product Number: 51322-17621-SG
Author: Douglas C Hansen, Ronald Zeszut, David Rubino
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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Atmospheric corrosion of silver from multiple beachfront sites in Florida was examined by coulometric reduction. Exposure was performed at the US Naval Research Laboratory in Key West, Kennedy Space Center, and Daytona Beach. Coupons were exposed for 3-18 months. Silver chloride and sulfide were identified and quantified by a galvanic reduction technique, which separately characterized the corrosion products on the front and back of each coupon. Differences were observed between sites for both chloride and sulfide growth rate. Silver chloride grew fastest at Daytona Beach, but no silver sulfide was observed on any samples at this site. Additionally, corrosion was observed to occur differently on the front and back of the samples. Increasing exposure times showed increasing corrosion film thickness, and exposure at different sites showed different corrosion film thicknesses and compositions. Additionally, the coulometric reduction technique has been examined in-depth to identify and mitigate possible difficulties in results interpretation which arise from thick and/or multi-component films.

Atmospheric corrosion of silver from multiple beachfront sites in Florida was examined by coulometric reduction. Exposure was performed at the US Naval Research Laboratory in Key West, Kennedy Space Center, and Daytona Beach. Coupons were exposed for 3-18 months. Silver chloride and sulfide were identified and quantified by a galvanic reduction technique, which separately characterized the corrosion products on the front and back of each coupon. Differences were observed between sites for both chloride and sulfide growth rate. Silver chloride grew fastest at Daytona Beach, but no silver sulfide was observed on any samples at this site. Additionally, corrosion was observed to occur differently on the front and back of the samples. Increasing exposure times showed increasing corrosion film thickness, and exposure at different sites showed different corrosion film thicknesses and compositions. Additionally, the coulometric reduction technique has been examined in-depth to identify and mitigate possible difficulties in results interpretation which arise from thick and/or multi-component films.

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