Nanometer growth of marine bio-films of different metallic alloys in seawater by electrochemical impedance spectroscopy

The main purpose of this study was to monitor the growth of the marine bio-film, of micro/macro-organisms, on the surface of different metallic alloys in seawater by electrochemical impedance spectroscopy (EIS). The alloys used in this study were; UNS 1020 carbon steel, stainless steel 304, stainles...

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Bibliographic Details
Published in:AIP advances 2019-04, Vol.9 (4), p.045026-045026-6
Main Authors: Al-Muhanna, Khalid, Habib, Khaled
Format: Article
Language:English
Subjects:
Aqueous solutions
Austenitic stainless steels
Biofilms
Capacitance
Carbon steel
Carbon steels
Copper
Electric double layer
Electrochemical impedance spectroscopy
Hastelloy (trademark)
Monitoring
Nickel
Seawater
Spectrum analysis
Stainless steel
Thickness
Titanium base alloys
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Summary:The main purpose of this study was to monitor the growth of the marine bio-film, of micro/macro-organisms, on the surface of different metallic alloys in seawater by electrochemical impedance spectroscopy (EIS). The alloys used in this study were; UNS 1020 carbon steel, stainless steel 304, stainless steel 316L, Sanicro 28, Cu–Ni 70–30, Hastelloy G-30, and titanium. The EIS was used to measure the A.C. Impedance (Z) and the double layer capacitance (Cdl) of the formed bio-film in seawater on a frequent basis. The total exposure time of the tests ranged between 90 days to 180 days. The visual inspection of the tested samples showed a bio-film formation on the surface of these samples. The microbiologically influenced (induced) corrosion (MIC) was observed only on the carbon steel. Monitoring the growth of the bio-film formation was accomplished by the EIS during the 90-180 days exposure of the tested samples. A gradual monitoring of the growth of the bio-film formation was achieved by mathematically correlating the obtained the A.C. Impedance (Z) and the double layer capacitance (Cdl) of the bio-film to the thickness of the bio-film formation. The advantage of EIS is a non-invasive technique with a sensing (spatial) resolution in a nanometer scale in a comparison to other techniques of monitoring the growth of bio-films on metallic alloys in aqueous solutions.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5026305