Accession Number : ADA131223

Title :   The Mechanism of Anaerobic (Microbial) Corrosion.

Descriptive Note : Technical summary rept. no. 1, 1 Jun-31 Dec 82,

Corporate Author : NATIONAL BUREAU OF STANDARDS WASHINGTON DC NATIONAL MEASUREMENT LAB

Personal Author(s) : Iverson,Warren P ; Olson,Gregory J

PDF Url : ADA131223

Report Date : Dec 1982

Pagination or Media Count : 40

Abstract : This report in the form of three papers describes research into the role of bacteria in anaerobic corrosion processes. During the year we have given more evidence for a novel mechanism of anaerobic corrosion in which a volatile, highly reactive phosporous compound is produced as a result of the activities of sulfate-reducing bacteria (Desulfovibio desuluricans). The corrosion product is an amorphous type of iron phosphide which can be detected by the formation of phosphine upon its acidification. Phosphine (in addition to H2S) has been detected from all the cases of suspected anaerobic corrosion (including tubercles from the inside of water pipes) examined so far. In examining the headspace over growing cultures of Desulfovibio to detect this volatile phosphorus containing compound, using a gas chromatograph (GC) with a flame photometric detector (FPD) specific for phosphorus and sulfur, two sulfur compounds, in addition to H2S, were detected and identified. These compounds, methylmercaptan, and dimethyldisulfide, were found to be relatively non-corrosive to iron under anaerobic conditions. No volatile phosphorus compounds were detected.

Descriptors :   *Corrosion, *Anaerobic bacteria, *Anaerobic processes, Iron compounds, Reduction(Chemistry), Hydrogen sulfide, Phosphine, Phosphorus, Metabolites, Microbiology

Subject Categories : Microbiology
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE