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Passivities of steels weathered for nine years SCIE SCOPUS

Title
Passivities of steels weathered for nine years
Authors
Park, JRKim, KY
Date Issued
2008-01
Publisher
NATL ASSOC CORROSION ENG
Abstract
A carbon steel (CS) and a weathering steel (WS) were weathered in a temperate urban atmosphere for nine years. Phases of their rust layers were examined. Their corrosion behaviors were probed in aerated, neutral 0.5 M sodium sulfate (Na2SO4) bulk solution or room temperature using the potentiodynamic anodic polarization technique. Passivities by the layers with a corrosion rate of 0.05 mm/y or less at the corrosion potential of -150 mV us saturated calomel electrode (SCE) or higher were observed, but they survived temporarily in the solution for 20 h and 5 h on the WS and CS covered with magnetite plus hematite phases. respectively, and 4 h and I h on the WS and CS with lepidocrocite plus goethite phases, respectively. They degraded with continued immersion in the solution accompanied by decreasing corrosion potential, finally near the active corrosion of bare steels. The passivities are under diffusion control of the iron ion dissolved from the base steels through the water in open pores of the layers but degrade by thinning and pore-opening of the layers under hydration and reductive reactions of the layers. The passivities are strengthened by integration and pore-seating of the layers with corrosion products of alloying elements for the WS and by more compact and less-reductive magnetite-containing phases than lepidocrocite-containing ones in the layers. These findings may be applied in the evaluation and improvement of corrosion resistance for WS.
Keywords
alloying elements; degradation; passivity; pore sealing; reductive dissolution; reductive transformation; weathering steel; THIN ELECTROLYTE LAYERS; ATMOSPHERIC CORROSION; ALLOYING ELEMENTS; RUST; METALS; ENVIRONMENTS; CARBON; STATE; IRON
URI
https://oasis.postech.ac.kr/handle/2014.oak/23007
DOI
10.5006/1.3278461
ISSN
0010-9312
Article Type
Article
Citation
CORROSION, vol. 64, no. 1, page. 4 - 14, 2008-01
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