Accession Number:

ADA537175

Title:

Tubercles and Localized Corrosion on Carbon Steel

Descriptive Note:

Conference paper

Corporate Author:

NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV

Report Date:

2011-02-16

Pagination or Media Count:

11.0

Abstract:

The chemistry, mineralogy and microbiology of tubercles on cast iron and carbon steel were investigated. Tubercles, from diverse fresh water environments and of varying ages, consistently had an outer crust of goethite and lepidocrocite and an inner shell of magnetite. Core regions differed in structure, composition and chemistry. The presence of tubercles on carbon steel and cast iron cannot be used to conclude localized corrosion directly under the tubercles or a role for bacteria in their formation.

Subject Categories:

  • Microbiology
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE