TY - JOUR
T1 - Long-term deterioration mechanism of hot-dip aluminum coating exposed to a coastal-atmospheric environment
AU - Kainuma, Shigenobu
AU - Yang, Muye
AU - Gao, Yang
AU - Hashimoto, Mikio
N1 - Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/4/19
Y1 - 2021/4/19
N2 - This study focused on the long-term corrosion mechanism of hot-dip aluminum (HDA) coating applied to a steel bridge exposed to a coastal-atmospheric environment. Aging HDA samples were taken from the actual bridge, and the corrosion product composition and morphology of the deterioration stages were investigated. The localized environmental assessment indicated that the surface orientation of the structural members led to a significant difference in salt accumulation and corrosion rate, with the most important influence being the rain-washing effect. Besides, open circuit potential, critical pitting potential, and aging sequence of different metallic phases were clarified. In addition, the long-term deterioration mechanism and pitting growth kinetics of aging HDA were speculated and verified with electrochemistry and elemental analysis.
AB - This study focused on the long-term corrosion mechanism of hot-dip aluminum (HDA) coating applied to a steel bridge exposed to a coastal-atmospheric environment. Aging HDA samples were taken from the actual bridge, and the corrosion product composition and morphology of the deterioration stages were investigated. The localized environmental assessment indicated that the surface orientation of the structural members led to a significant difference in salt accumulation and corrosion rate, with the most important influence being the rain-washing effect. Besides, open circuit potential, critical pitting potential, and aging sequence of different metallic phases were clarified. In addition, the long-term deterioration mechanism and pitting growth kinetics of aging HDA were speculated and verified with electrochemistry and elemental analysis.
KW - Corrosion
KW - Electrochemical test
KW - Environmental assessment
KW - Hot-dip Al coating
KW - SEM-EDS
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U2 - 10.1016/j.conbuildmat.2021.122516
DO - 10.1016/j.conbuildmat.2021.122516
M3 - Article
AN - SCOPUS:85100683760
SN - 0950-0618
VL - 280
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 122516
ER -