Accession Number : ADA319382

Title :   The Characterization of Microbiologically Influenced Corrosion (MIC) Under Cathodic Protection Conditions.

Descriptive Note : Annual technical rept. Oct 95-Oct 96,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK COLL OF EARTH AND MINERAL SCIENCES

Personal Author(s) : Macdonald, Digby D. ; Unz, Richard

PDF Url : ADA319382

Report Date : OCT 1996

Pagination or Media Count : 82

Abstract : The goal of the present research is to investigate the effectiveness of cathodic protection in preventing, halting, or limiting the microbiologically influenced corrosion (MIC) of carbon steel substrates in seawater. MIC is defined as the corrosion resulting from the interaction of bacteria, especially Sulfate Reducing Bacteria (SRB), and their biological end products with metal surfaces. In order to address this problem, four key issues are being investigated. Firstly, the chemical and electrochemical conditions beneath biofilm must be determined. Secondly, the thermodynamic conditions necessary at the surface of the substrate for cathodic protection to be effective must be known. Thirdly, the process by which SRB colonize and adhere to steel surfaces needs to be examined. Finally, the effectiveness of impressed current cathodic protection techniques on inhibiting corrosion due to the presence of biofilms and tubercles on the carbon steel surface must be investigated.

Descriptors :   *CORROSION, *CATHODIC PROTECTION, *MICROBIOLOGICAL TESTS, METALS, INTERACTIONS, CHEMICALS, THERMODYNAMICS, BACTERIA, FILMS, ELECTROCHEMISTRY, SUBSTRATES, SURFACES, ORGANIC MATERIALS, SULFATES, SEA WATER, CARBON STEELS, REDUCTION(CHEMISTRY).

Subject Categories : Properties of Metals and Alloys
      Industrial Chemistry and Chemical Processing
      Inorganic Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE