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Adhered oysters can cause complex corrosion of fouled steel structures, with localized crevice corrosion being the most severe. A crevice corrosion model of steel caused by oysters is proposed, showing that oyster secretions can penetrate into the oyster/steel interface and act as a stabilizer of the rust layer, enabling tight attachment and thereby slowing the metal corrosion rate. In contrast, oxygen concentration cells, enriched Cl-, anaerobic bacteria, the presence of organic free radicals and oxidative cross-linking during the curing process of oyster secretions act as localized corrosion accelerators facilitating the crevice corrosion process in the oyster/steel gap. [Display omitted] • Adhered oysters could cause severe localized crevice corrosion of fouled steel structures. • Oyster secretions could act as a stabilizer of the rust layer. • Synergistic effects of fouling and inorganic factors acted as localized corrosion accelerators. • The proliferation of anaerobic bacteria enhanced the corrosion in the crevice. • Oyster influenced marine corrosion model was proposed. [ABSTRACT FROM AUTHOR]

A comparative experiment was set up in a field site and laboratory to study the effect of barnacles (model organisms of macrofouling) on the corrosion behavior of a low-alloy high-strength steel. The results indicated that barnacle adhesion can slow the corrosion rate of steel in an immersion environment by hindering the diffusion of corrosive ions. It was found that barnacle adhesion had a significant promotion effect on localized corrosion. Due to steel's high corrosion rate, the corrosion-impeding effect was improved, and the promotion effect on localized corrosion was weakened. The study proposed a corrosion mechanism model influenced by barnacles. • A comparative experiment was set up in a field site and laboratory. • Barnacle adhesion can slow the corrosion rate of steel in an immersion environment. • Barnacle adhesion hinders the diffusion of corrosive ions to the steel surface. • Barnacle adhesion had a significant promotion effect on localized corrosion. • The accumulation of barnacle metabolites can promote the corrosion of steel. [ABSTRACT FROM AUTHOR]