Abstract
An understanding of the interaction of calcareous deposits and biofoulants on the corrosion performance of steel during the fouling stage is both interesting and necessary. So, the effects of these factors on Q235 carbon steel were investigated and discussed for 20 weeks under real ocean conditions. The results indicate that calcareous deposits are favorable for the attachment of marine microorganisms. However, macroorganisms prefer adhering directly to the substrate. The generations of calcareous deposits have priority over the biofilm attachment under the condition of cathodic protection. Calcareous deposits can prevent steel against corrosion for four weeks without cathodic protection.
Highlights
Biofouling and seawater corrosion are two natural processes that occur at the interface between the metal and seawater, and they are important factors threatening the safety of sea-based facilities [1].Biofouling on submerged surfaces in the marine environment has attracted serious problems for shipping, platform, and coastal industries [2]
The unprotected samples with pre-existing calcareous deposits were subjected to slight corrosion (Figure 2C), but serious corrosion occurred for the anode-uncoupled bare steel samples, which implies that the calcareous deposits offered certain protection to the carbon steel submerged in the sea forMaterials four weeks
Samples with calcareous deposits were colonized by microorganisms [38,39], which is consistent with the results shown in Figure 2, and the biofouling adhesion was progressive
Summary
Biofouling and seawater corrosion are two natural processes that occur at the interface between the metal and seawater, and they are important factors threatening the safety of sea-based facilities [1]. Some tests have been conducted, either in the laboratory or actual field, into applying cathodic protection to carbon steel to investigate the influence of marine sediments, clay, bacteria, and various ions on the formation of calcareous deposits [25,26,27,28]. The reports concerning the protective effects of calcareous deposits on the corrosion performance of metallic materials over the entire fouling process have not yet been totally explored, which involve microorganism and macroorganism attachment. A 20-week test was conducted in a real ocean environment to investigate the corrosion resistance of calcareous deposits formed by a sacrificial anode on Q235 carbon steel and any changes induced by the attachment of biofoulants during the fouling stage. The interactions between microbes, algae, and macroorganism with calcareous deposits were analyzed in detail
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