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Two-Year Atmospheric Corrosion and Accelerated Corrosion Test: A Comparative Study

Product Number: 51315-5957-SG
ISBN: 5957 2015 CP
Author: Yuhchae Yoon
Publication Date: 2015
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The accelerated corrosion of pure silver three aerospace aluminum alloys (2020 6061 and 7075) pure copper and 1010 carbon steel in a standard ASTM B117 (5wt% NaCl solution at 95 oF and 95% RH) salt spray test as well as a modified ASTM B117 salt spray test that included ozone (100 and 800 ppb) and UV-A (0.1 and 0.85 W/m2) were investigated and compared to the corrosion observed on identical samples exposed over a two year period in the field at eight geographic locations The effects of environmental and climate factors on the atmospheric corrosion of both the field and chamber exposed samples were determined with gravimetric measurements coulometric reduction and chemical composition and morphology using scanning electron microscopy - energy dispersive spectroscopy (SEM-EDS). Remarkable differences between different exposure sites were observed. AA7075-T6 and AA2024-T3 exposed at Daytona Beach exhibited the highest mass loss while those at Kirtland site showed lowest weight loss. Silver coupons exposed at Daytona Beach also showed the highest AgCl film thickness while silver coupons at Kirtland exposure site showed the lowest film thickness Processing marks on the samples still visible on the surface after 24 months exposure at Kirtland AFB indicate very little corrosion product build up. The corrosion rates of the samples exposed in the modified B117 corrosion chamber under UV and ozone conditions were much higher than those of the field exposures as well as the standard B117 salt spray test. There was also a difference in corrosion morphology and elemental composition of the metal coupons over time between the chamber and field exposures.
The accelerated corrosion of pure silver three aerospace aluminum alloys (2020 6061 and 7075) pure copper and 1010 carbon steel in a standard ASTM B117 (5wt% NaCl solution at 95 oF and 95% RH) salt spray test as well as a modified ASTM B117 salt spray test that included ozone (100 and 800 ppb) and UV-A (0.1 and 0.85 W/m2) were investigated and compared to the corrosion observed on identical samples exposed over a two year period in the field at eight geographic locations The effects of environmental and climate factors on the atmospheric corrosion of both the field and chamber exposed samples were determined with gravimetric measurements coulometric reduction and chemical composition and morphology using scanning electron microscopy - energy dispersive spectroscopy (SEM-EDS). Remarkable differences between different exposure sites were observed. AA7075-T6 and AA2024-T3 exposed at Daytona Beach exhibited the highest mass loss while those at Kirtland site showed lowest weight loss. Silver coupons exposed at Daytona Beach also showed the highest AgCl film thickness while silver coupons at Kirtland exposure site showed the lowest film thickness Processing marks on the samples still visible on the surface after 24 months exposure at Kirtland AFB indicate very little corrosion product build up. The corrosion rates of the samples exposed in the modified B117 corrosion chamber under UV and ozone conditions were much higher than those of the field exposures as well as the standard B117 salt spray test. There was also a difference in corrosion morphology and elemental composition of the metal coupons over time between the chamber and field exposures.
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