Abstract
The paper presents the assessment of inhibition effectiveness of biomolecules extracted from red seaweed against biocorrosion in the petroleum industry. The first objective of this study was to obtain extracts (A, B and C, prepared respectively from red algae species: Corallina ellongata, Gymnogongrus crenulatus and Pterocladia capillacea) by ethanol extraction method. The infrared spectra of the three extracts confirmed the presence of amine derivatives molecules known by their anti-corrosion inhibiting powers. The second objective was based on the identification of physico-chemical characteristics of the extracts and thus revealing their inhibitory and / or bactericidal power in bacterial corrosion of carbon steel in injection water contaminated with sulfato-reducing bacteria. Biological test of all extracts gave a concentration upto 10 germs/mL in contaminated water by sulfato-reducing bacteria during 28 days of incubation at 37�C. Evolution in time of the open-circuit potential showed a longer incubation time for electrolyte with extracts, whereas the stabilization time was shorter. Current corrosion density, polarization resistance, charge transfer resistance and double layer capacity were determined by using linear polarizarion resistance technique and electrochemical impedance spectroscopy. The corrosion protection efficiency of extract obtained from Gymnogongrus crenulatus (extract B) reached a maximum protective capacity of 99.69% at 5 ppm in the injection water.
Highlights
The degradation of metals under the influence of microorganisms, called biocorrosion, has significant repercussions on the environment and on economy in various industrial fields, notably the oil industry [1]
The main objective of this work is to study inhibitory effect of three natural products extracted from marine red algae on biocorrosion of carbon steel immersed in injection water contaminated by sulfato-reducing bacteria (SRB) as well as identification of protective films formed on carbon steel surface by several electrochemical techniques: open-circuit potential (OCP) in time, linear polarization resistance (LPR) technique and electrochemical impedance spectroscopy (EIS)
We studied inhibition efficiency treatment of biocorrosion with natural extracts from three species of marine red algae that we identified: Corallina elongata, Gymnogongrus crenulatus and Pterocladia capillacea
Summary
The degradation of metals under the influence of microorganisms, called biocorrosion, has significant repercussions on the environment and on economy in various industrial fields, notably the oil industry [1]. Red algae are present in fresh water but mostly are marine, they are found in particular on the tropical and subtropical coasts. Corallina mediterranea or Ellisolandia elongata) from Corallinaceae family, an autotrophic marine red alga which inhabits light rocks (photopile species) in calm water and is very tolerant to pollution (opportunistic species) [9]. The main objective of this work is to study inhibitory effect of three natural products extracted from marine red algae on biocorrosion of carbon steel immersed in injection water contaminated by SRB as well as identification of protective films formed on carbon steel surface by several electrochemical techniques: open-circuit potential (OCP) in time, linear polarization resistance (LPR) technique and electrochemical impedance spectroscopy (EIS)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
