Marine atmospheric corrosion of carbon steel in the tropical microclimate of Port Louis
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25 November 2022
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The atmospheric corrosion performance of S235 carbon steel is assessed when
exposed to the tropical/marine aerosol pollutants of Port Louis, Mauritius. Port
Louis is situated on the northwest coast and has a distinct microclimate, leading
to major atmospheric corrosion concerns. In addition, sulphur dioxide emissions
from three heavy oil‐fired power stations complicate corrosion prediction within
the region. Mass‐loss analysis shows distinctive corrosion progression behaviours
linked to the environmental and geographical variables. The formation of porous
surface layers leads to a continuous increase in metal dissolution during the
electrochemical process. The surface analysis reveals lepidocrocite (γ‐FeOOH)
and goethite (α‐FeOOH) as the predominant rust phases, with low percentages
of magnetite (Fe O3 4 ), akageneite (β‐FeOOH) and jarosite (KFe (OH) (SO ) ) 3 6 42 .
A key insight in the S235 atmospheric corrosion involves two stages: the early
rapid corrosion stage followed by a slow stage of linear or power‐law corrosion
kinetics due to the formation of stable rust phases.
