Long-term deterioration mechanism of hot-dip aluminum coating exposed to a coastal-atmospheric environment

Shigenobu Kainuma, Muye Yang, Yang Gao, Mikio Hashimoto

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number122516
JournalConstruction and Building Materials
Volume280
DOIs
Publication statusPublished - Apr 19 2021

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

Fingerprint Dive into the research topics of 'Long-term deterioration mechanism of hot-dip aluminum coating exposed to a coastal-atmospheric environment'. Together they form a unique fingerprint.

Cite this