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Tuesday, March 18, 2008 - 10:05 AM
Convention Center, Second Level, 220 (Ernest N. Morial Convention Center)
EFFECT OF ALLOYING ELEMENTS ON ATMOSPHERIC CORROSION OF WEATHERING STEEL CONTAINING COPPER AND MANGANESE
The atmospheric corrosion performance of new weathering steel with addition of alloying elements Mn and Cu was evaluated by using wet/dry cyclic accelerated corrosion test, electrochemical polarization curve and electrochemical impedance spectrum. The rust on the surface was analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM), electron probe micro-analysis (EPMA) and X-ray photoelectron spectra (XPS). With increasing the wet/dry cycles, the corrosion resistance of the rust layer was increased. The weathering steel containing Cu and Mn accelerated the cathodic reduction while restrained the anodic dissolution. Moreover, the rust layer of the steel showed a higher corrosion resistance than Cu-bearing steel. XRD patterns indicated that the content of each phase in the rust of mild steel, Mn-bearing steel, Cu-bearing steel and Mn-Cu mixture bearing steel was quite different. SEM images showed that the adhesion of the rust formed on weathering steel with copper and manganese-alloying elements was better than another weathering steel, 09CuPTiRE. The result of EPMA measurement indicated the distribution of copper and manganese in the cross section of the rust layer, and the result of XPS measurement indicated the oxidation state of manganese in the rust.
See more of Research in Progress - Corrosion in High Resistivity Media
See more of Research in Progress
See more of The CORROSION 2008 Conference and Expo (March 16-20, 2008)
See more of Research in Progress
See more of The CORROSION 2008 Conference and Expo (March 16-20, 2008)