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This is a Quantitative Study study (also classified as: Experimental Study).

September 23, 2025Open Access

Inhibition of Microbiologically Influenced Corrosion of 304 Stainless Steel by Artemisia annua L. in Simulated Seawater

Key Points

A. annua extract reduced corrosion by 74.4% under marine conditions, protecting 304 stainless steel.
Pseudomonas aeruginosa biofilm led to significant localized corrosion up to 3.75 μm depth on untreated stainless steel.
Surface modification with A. annua resulted in the formation of a stable Fe3O4 layer rather than harmful corrosion products.
ATR-FTIR analysis confirmed phenolic groups from A. annua extract were present on the steel, aiding in corrosion prevention.

Abstract

The combination of electrochemical, surface, and spectroscopic techniques revealed that Pseudomonas aeruginosa biofilm accelerated corrosion of 304 stainless steel (SS), leading to localized pitting with depths up to 3.75 μm. Such damage did not occur on 304 SS treated with P. aeruginosa in the presence of Artemisia annua L. extract, or in sterile seawater. Introducing A. annua into biotic seawater hindered biofilm development and prevented the formation of porous Fe(III) corrosion products. Instead, a compact Fe3O4 layer formed, indicating a shift in corrosion product morphology and stability. ATR-FTIR analysis confirmed phenolic groups from the extract were adsorbed onto the steel interface, supporting the dual inhibitory role of A. annua through both surface modification and antimicrobial action. A. annua extract demonstrated a 74.4 ± 4.4% reduction in MIC-induced corrosion of 304 SS in marine conditions.

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