Fate of corrosion products released from stainless steel in marine sediments and seawater. Part 4: Hatteras abyssal red clay

• Main Author: Schmidt, R. L.
• Format: Report
• Language: English
• Published: Pacific Northwest Laboratory 1982
• Subjects: Atlantic Ocean; Manganese Oxides; Alloys; Nickel; Minutes Living Radioisotopes; Redox Reactions; Nickel Alloys; Radiation Effects; Chemical Radiation Effects; Elements; Isotope Applications; Oxides; Seawater; Chromium Alloys; Years Living Radioisotopes 520200* > Environment; Aquatic > Chemicals Monitoring & Transport > (-1989); Numerical Data; Chemical Reactions; Beta-Minus Decay Radioisotopes; Radioisotopes; Data; Steels; Isotopes; Chalcogenides; Heat Resistant Materials; Sediments; Oxygen; Radionuclide Migration; Cobalt Isotopes; Clays; Manganese; Cobalt 60; Materials; Niobium Additions; Isomeric Transition Isotopes; Iron; Iron Oxides; Corrosion Products; Internal Conversion Radioisotopes; Iron Alloys; Chromium-Nickel Steels; Mass Transfer; Surface Waters; Stainless Steel-347; Waste Disposal; Beta Decay Radioisotopes; Seas; Cobalt; Metals; Chemistry; Experimental Data; Heat Resisting Alloys; Zinc; Radioactivation; Environmental Transport; Chromium; Oxygen Compounds; Chemical State; Radioactive Waste Disposal; Management; Nuclei; Information; Corrosion Resistant Alloys; Intermediate Mass Nuclei; Odd-Odd Nuclei; Tracer Techniques; Iron Compounds; Waste Management; Stainless Steels; Niobium Alloys; Nonmetals; Hydrogen Compounds; Geochemistry; Water; 520302 > Environment; Aquatic > Radioactive Materials Monitoring & Transport > Aquatic Ecosystems & Food Chains > (-1987); 54 Environmental Sciences; Chromium Steels; Manganese Compounds; Transition Elements; Radiation Chemistry; Iron Base Alloys; Transition Element Compounds; Northwest Atlantic
• Online Access: https://doi.org/10.2172/5106354; https://digital.library.unt.edu/ark:/67531/metadc1061471/

A study in which neutron-activated 347 stainless steel was exposed to surficial sediment from a site in the Hatteras Abyssal Plain of the Northwest Atlantic Ocean is described. This sediment consists of approx. 20% CaCO/sub 3/, which could lead to the formation of calcareous scale on the metal surface and reduce the corrosion rate. The distribution of indigenous metals among different chemical fractions shows that extractable Cr, Mn, Fe, Co, and Zn were associated with amorphous Mn and Fe oxides. Most of the remaining extractable Cr, and about a third of the extractable Cu appear to have been weakly complexed. Major fractions (25 to 36%) of extractable Mn, Co and Ni were present as adsorbed cations. Organic complexation appears to account for a large amount of extractable Fe, Ni, Cu and Zn. Neutron-activated 347 stainless steel specimens were exposed to sediment slurry under aerobic and non-oxygenated conditions for a period of 94 days. The redox potential measurements for air-sparged and N/sub 2/, CO/sub 2/-sparged sediment slurries were +410 and +60 mv, respectively. The presence of 0/sub 2/ produced increased amounts of corrosion products. Chemical extraction showed that relatively labile substances constituted about 84% of the /sup 60/Co activity released in aerated sediment. Relatively labile substances constitute about 82% of the total /sup 60/Co activity released under non-oxygenated conditions. A large fraction of /sup 60/Co which was in the soluble or easily dissolved forms under non-oxygenated conditions appears to have been more strongly adsorbed to the sediment under aerated conditions.