MICROBIAL CORROSION
Abstract
An agar medium which will support good surface growth of marine sulfate reducers (Desulfovibrio) has been devised. Using this medium, a marine isolate of Desulfovibrio has been obtained in pure culture and used for anaerobic corrosion studies. Using polarization techniques for corrosion rate determinations, it was found that the rate of corrosion of mild steel (1020), in a culture of the same medium minus added ferrous ions, decreased to about 0.1 mdd and then increased to 7-8 mdd before termination. These changes were correlated with the formation and removal of an iron sulfide film. A non-marine strain of Desulfovibrio was found to produce a volatile organophosphorous compound which reacts with mild steel to form iron phosphide (Fe2P). It also has the ability to reduce the redox dye, benzyl viologen. The marine isolate also appears to produce this compound. Growth of the marine strain in a sea water medium containing ferrous ions to which trypticase and phytone were added resulted in formation of a black material, which upon heating to 1,204C in a vacuum oven, was found to consist of a mixture of FeS and Fe3P (schreibersite).
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 30, 1969
- Accession Number
- AD0693474
Entities
People
- Joan Calvert
- Warren P. Iverson
Organizations
- National Institute of Standards and Technology