Importance of biofilm formation for corrosion inhibition of SAE 1018 steel by axenic aerobic biofilms |
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Authors: | A Jayaraman E T Cheng J C Earthman T K Wood |
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Institution: | (1) Department of Chemical and Biochemical Engineering & Materials Science, University of California, Irvine, CA 92697-2575, USA, US;(2) Department of Chemical Engineering, University of California, Los Angeles, CA 90095, USA, US |
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Abstract: | To investigate if corrosion inhibition by aerobic biofilms is a general phenomenon, carbon steel (SAE 1018) coupons were
exposed to a complex liquid medium (Luria–Bertani) and seawater-mimicking medium (VNSS) containing fifteen different pure-culture
bacterial suspensions representing seven genera. Compared to sterile controls, the mass loss in the presence of these bacteria
(which are capable of developing a biofilm to various degrees) decreased by 2- to 15-fold. The extent of corrosion inhibition
in LB medium depended on the nature of the biofilm: an increased proportion of live cells, observed with confocal scanning
laser microscopy (CSLM) and image analysis, decreased corrosion. Corrosion inhibition in LB medium was greatest with Pseudomonas putida (good biofilm formation), while metal coupons exposed to Streptomyces lividans in LB medium (poor biofilm formation) corroded in a manner similar to the sterile controls. Pseudomonas mendocina KR1 reduced corrosion the most in VNSS. It appears that only a small layer of active, respiring cells is required to inhibit
corrosion, and the corrosion inhibition observed is due to the attached biofilm.
Received 09 December 1996/ Accepted in revised form 19 March 1997 |
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Keywords: | : biofilms corrosion inhibition confocal scanning laser microscopy |
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