Accession Number:

ADA495963

Title:

The Influence of Marine Biofilms on Corrosion: A Concise Review

Descriptive Note:

Journal article

Corporate Author:

NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV

Personal Author(s):

• Little, Brenda J.
• Lee, Jason S.
• Ray, Richard I.

Report Date:

2008-01-01

Pagination or Media Count:

7.0

Abstract:

The following is a concise review of the literature that addresses the impact of marine biofilms on two phenomena--ennoblement of corrosion potential and sulfide derivitization due to sulfate-reducing bacteria. A universally defined mechanism of potential ennoblement has not been established. Extent of ennoblement varies among locations and the extent of ennoblement for a particular material cannot be used to predict an increased likelihood of localized corrosion. There is some controversy as to the susceptibility of low-and medium-grade stainless steels. Carbon steel and copper alloys are susceptible to sulfide derivitization but thermodynamic models cannot predict the susceptibility of these materials. Laboratory experiments designed to provide data on susceptibility to sulfide derivitization have produced conflicting results because of the following 1 laboratory media can contain anions that inhibit localized corrosion, 2 laboratory media can contain yeast extract that interferes with electrochemical measurements, and 3 deaeration procedures can produce environments that are not conducive for the growth of sulfate-reducing bacteria. In general, alloys that undergo ennoblement are not vulnerable to sulfide derivitization and conversely, alloys that are subject to sulfide derivitization do not become ennobled.

Descriptors:

• *SEA WATER
• *CORROSION
• *FOULING ORGANISMS
• *COPPER ALLOYS
• DEAERATION
• SULFIDES
• CARBON STEELS
• REDUCTION(CHEMISTRY)
• FOULING
• STAINLESS STEEL
• BACTERIA
• REPRINTS
• SULFATES

Subject Categories:

• Physical Chemistry
• Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE