Accession Number : ADA305227

Title :   Inhibition of Microbiologically Influenced Corrosion.

Descriptive Note : Annual rept. 1 Oct 94-15 Nov 95,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Natishan, P. M. ; Loeb, G. I. ; Hansen, D. C.

PDF Url : ADA305227

Report Date : 07 FEB 1996

Pagination or Media Count : 26

Abstract : Two polydimethylsiloxane (PEG) coatings have produced dramatic increases in the abiotic corrosion resistance of 4340 steel in O.6M NaCi solutions. The Coatings were selected based on the mechanical sensing model of microbial attachment and were designed to suppress attachment as well as prevent corrosion. Exposure of the PEGS to marine microorganisms and the estuary waters showed that the degree of colonization by organisms was less on the silicone surfaces than on the untreated metal or rigid surfaces as would be predicted by the mechanical sensing model. A second approach to understanding colonization and determining effective inhibitors considers the metal to play an active role in attracting microorganisms through the release of metal ions (corrosion) local pH changes (corrosion), or by its surface charge character. Preliminary results indicate that a relationship between corrosion, the nutrient quality of the substrate for microorganisms, and microbial colonization may exist.

Descriptors :   *CORROSION RESISTANCE, *MARINE BIOLOGY, *MICROBIOLOGY, *MICROORGANISMS, IONS, METALS, DETECTION, CORROSION, MODELS, METHYL RADICALS, POLYMERS, SUBSTRATES, NUTRIENTS, SILOXANES, SURFACES, COATINGS, QUALITY, RELEASE, ATTACHMENT, INHIBITION, RIGIDITY, PH FACTOR, MECHANICAL COMPONENTS, SILICONES, ABIOTIC PROCESSES, STATIC ELECTRICITY, ESTUARIES.

Subject Categories : Properties of Metals and Alloys
      Microbiology
      Biological Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE