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Formation of Rust Scales on Mild Steel Pile in Brackish Water of Phu My Port - Vietnam

  • Vinh-Dat Vuong
  • Anh Quang Vu
  • Marina Kawai
  • Kazuhito Tsujimoto
  • Thang Van Le
  • Nguyen Danh ThaoEmail author
Conference paper
  • 21 Downloads
Part of the Lecture Notes in Civil Engineering book series (LNCE, volume 54)

Abstract

Corrosion test of mild steel (graded JIS-STK400) was investigated in brackish water environment of Phu My industrial port (Ba Ria - Vung Tau Province, Vietnam). Steel sample was exposed in 3 years. X-ray diffraction (XRD) results show that formed rust powder was composed of a-FeOOH, Fe3O4 and a- Fe2O3 in which the amount of first component is larger than second and third one. It demonstrates that natural corrosion products evolved from low to high oxida-tion state of iron by presence of dissolved oxygen in brackish environment. The mechanism of phase conversion is revealed by metallographic of rust layer cross section. a-Fe2O3 (white phase) was gathered at bank of cracking paths where was favouring diffusion of oxygen and water into inner layer. After contacting Fe3O4 (dark gray phase), corrosive agents converted it to a-FeOOH and a-Fe2O3. The phase conversion changes the weight density of materials and creates the porous tunnels in rust scales. The growth of micro tunnels to form the tunnel network allowed internal stress and cracks of rust scales evolved.

Keywords

rust peeling off rust formation metallography brackish water in-dustrial port 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  • Vinh-Dat Vuong
    • 1
    • 2
    • 3
  • Anh Quang Vu
    • 1
  • Marina Kawai
    • 4
  • Kazuhito Tsujimoto
    • 4
  • Thang Van Le
    • 1
    • 2
  • Nguyen Danh Thao
    • 5
    Email author
  1. 1.Department of Energy Materials, Faculty of Materials TechnologyHCMUT, VNU-HCMHo Chi Minh CityVietnam
  2. 2.Material Technologies LaboratoryHCMUT, VNU-HCMHo Chi Minh CityVietnam
  3. 3.Graduate University of Science and Technology, VASTHo Chi Minh CityVietnam
  4. 4.JFE Steel CorporationTokyoJapan
  5. 5.Department of Port and Coastal Engineering, Faculty of Civil EngineeringHCMUT, VNU-HCMHo Chi Minh CityVietnam

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