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51315-5881-The Effects of Solar Radiation on the Surface Temperatures of Various Alloys Exposed to Atmospheric Corrosion Conditions

Picture for The Effects of Solar Radiation on the Surface Temperatures of Various Alloys Exposed to Atmospheric
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Product Number: 51315-5881-SG
ISBN: 5881 2015 CP
Author: Darren Horiuchi
Publication Date: 2015
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The Effects of Solar Radiation on the Surface Temperatures of Various Alloys Exposed to Atmospheric Corrosion Conditions

Darren Horiuchi and L.H. Hihara

Hawaii Corrosion Laboratory

Dept of Mech Engg

University of Hawaii at Manoa

Honolulu HI

The surface temperature of alloys of different base metals will equilibrate to different temperatures depending on their solar reflectance index (SRI). The buildup of corrosion products can also have a significant effect on specimen surface temperatures due to changes in emissivity which affects the SRI.In this study the surface temperatures of exposed metallic specimens (i.e. zinc magnesium 1008 steel 304 stainless steel CA-110 copper 1060 aluminum 2024-T3 aluminum and 6061-T6 aluminum) were monitored in severe marine (Marine Corps Base Hawaii) rain forest (Lyon Arboretum) and high-altitude (Mauna Loa Observatory) environments. Theemissivities of virgin and exposed specimens were measured. The maximum recorded temperature difference that occurred simultaneously for samples located at the same site (Lyon Arboretum) was 28.6°C between CA-110 copper and 6061-T6 aluminum. The smallest temperature variation between samples occurred at the Mauna Loa Observatory where solar radiation was high but corrosion product formation was low. Theemissivites of the virgin samples were predictably low (typically e ? 0.1). The formation of corrosion products increasedemissivities but to different extents based on the alloy type. In some cases significant differences inemissivities were measured for the sky-facing and ground-facing sample surfaces. A correlation between daytime peak temperature and accelerated evening cooling was also observed.That is the hottest specimens during the day were also the coolest at night resulting from large emissivity values.

Acknowledgements

The authors are grateful for the support of the US Marine Corps (Oakridge National Laboratory Contract No.4000106469) for the Pacific Rim Corrosion Assessment and Mitigation Program (PacRimCAMP).The authors are particularly grateful to Mr. Mathew Koch Corrosion Prevention and Control Executive for the Department of the Navy; Mr. Andrew Sheetz Naval Surface Warfare CenterCarderock Division; and Drs. J. Allen Haynes and StevePawel Oakridge National Laboratory.The authors are also grateful to Mr. Ryan Sugamoto and Daniel Hong of the Hawaii Corrosion Laboratory for deployment of the atmospheric corrosion specimens.

The Effects of Solar Radiation on the Surface Temperatures of Various Alloys Exposed to Atmospheric Corrosion Conditions

Darren Horiuchi and L.H. Hihara

Hawaii Corrosion Laboratory

Dept of Mech Engg

University of Hawaii at Manoa

Honolulu HI

The surface temperature of alloys of different base metals will equilibrate to different temperatures depending on their solar reflectance index (SRI). The buildup of corrosion products can also have a significant effect on specimen surface temperatures due to changes in emissivity which affects the SRI.In this study the surface temperatures of exposed metallic specimens (i.e. zinc magnesium 1008 steel 304 stainless steel CA-110 copper 1060 aluminum 2024-T3 aluminum and 6061-T6 aluminum) were monitored in severe marine (Marine Corps Base Hawaii) rain forest (Lyon Arboretum) and high-altitude (Mauna Loa Observatory) environments. Theemissivities of virgin and exposed specimens were measured. The maximum recorded temperature difference that occurred simultaneously for samples located at the same site (Lyon Arboretum) was 28.6°C between CA-110 copper and 6061-T6 aluminum. The smallest temperature variation between samples occurred at the Mauna Loa Observatory where solar radiation was high but corrosion product formation was low. Theemissivites of the virgin samples were predictably low (typically e ? 0.1). The formation of corrosion products increasedemissivities but to different extents based on the alloy type. In some cases significant differences inemissivities were measured for the sky-facing and ground-facing sample surfaces. A correlation between daytime peak temperature and accelerated evening cooling was also observed.That is the hottest specimens during the day were also the coolest at night resulting from large emissivity values.

Acknowledgements

The authors are grateful for the support of the US Marine Corps (Oakridge National Laboratory Contract No.4000106469) for the Pacific Rim Corrosion Assessment and Mitigation Program (PacRimCAMP).The authors are particularly grateful to Mr. Mathew Koch Corrosion Prevention and Control Executive for the Department of the Navy; Mr. Andrew Sheetz Naval Surface Warfare CenterCarderock Division; and Drs. J. Allen Haynes and StevePawel Oakridge National Laboratory.The authors are also grateful to Mr. Ryan Sugamoto and Daniel Hong of the Hawaii Corrosion Laboratory for deployment of the atmospheric corrosion specimens.

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