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Crevice Corrosion of Stainless Steel in Tropical Seas

Differences between temperate and tropical sites in terms of electrochemical behavior (e.g. open-circuit potential and cathodic current for oxygen reduction). One difference is critical temperature for biofilm ennoblement. Results are discussed in terms of risk for crevice corrosion for stainless steels in tropical seas. 

Product Number: 51317--9327-SG
ISBN: 9327 2017 CP
Author: Dominique Thierry
Publication Date: 2017
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Stainless steels are widely used for different applications in seawater in the oil and gas and desalination industry. In natural seawater surfaces will be rapidly covered by microorganisms which form a thin film called biofilm inducing a significant shift of the corrosion potential for stainless steel to the noble direction. The other significant effect of the biofilm on metallic surfaces is a dramatic increase of the cathodic efficiency (e. g. cathodic reduction of dissolved oxygen) promoting the corrosion reactions and increasing the rate of corrosion propagation. Although this phenomenon has been widely studied in natural seawater from temperate locations very little is known on natural tropical sites in which bioactivity is expected to be different. Electrochemical potential measurements and measurements with homemade biofilm sensors have been performed at different temperatures in temperate and in tropical seawaters. The study aimed at defining the differences between temperate and tropical sites in term of electrochemical behaviour of stainless steels (potentials and cathodic current). One of the main differences was found to be the critical temperature for biofilm ennoblement which is different for temperate and tropical seawaters. The results are discussed in terms of risk for localized corrosion.

Key words: Marine corrosion, tropical sea, corrosion, stainless steel

Stainless steels are widely used for different applications in seawater in the oil and gas and desalination industry. In natural seawater surfaces will be rapidly covered by microorganisms which form a thin film called biofilm inducing a significant shift of the corrosion potential for stainless steel to the noble direction. The other significant effect of the biofilm on metallic surfaces is a dramatic increase of the cathodic efficiency (e. g. cathodic reduction of dissolved oxygen) promoting the corrosion reactions and increasing the rate of corrosion propagation. Although this phenomenon has been widely studied in natural seawater from temperate locations very little is known on natural tropical sites in which bioactivity is expected to be different. Electrochemical potential measurements and measurements with homemade biofilm sensors have been performed at different temperatures in temperate and in tropical seawaters. The study aimed at defining the differences between temperate and tropical sites in term of electrochemical behaviour of stainless steels (potentials and cathodic current). One of the main differences was found to be the critical temperature for biofilm ennoblement which is different for temperate and tropical seawaters. The results are discussed in terms of risk for localized corrosion.

Key words: Marine corrosion, tropical sea, corrosion, stainless steel

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