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.

Subject
Films, Energy dispersive X-ray spectroscopy, Chloride deposition, Voltage, Overpotential, Sulfide films, Metal coupons, Film formation, Sulfides, Risk reduction, Chlorides, Concentration cells, Samples
Keywords:
corrosion, silver, silver chloride, atmospheric corrosion, coulometric reduction
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2022
Association for Materials Protection and Performance (AMPP)
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