Ceramic Coatings for Corrosion Resistant Nuclear Waste Container Evaluated in Simulated Ground Water at 90?C

Journal Article · Wed Mar 31 04:00:00 EST 2004 · Metallurgical and Materials Transactions, vol. 36A, n/a, May 1, 2005, pp. 1085-1095

OSTI ID:900124

Haslam, J J; Farmer, J C

Ceramic materials have been considered as corrosion resistant coatings for nuclear waste containers. Their suitability can be derived from the fully oxidized state for selected metal oxides. Several types of ceramic coatings applied to plain carbon steel substrates by thermal spray techniques have been exposed to 90 C simulated ground water for nearly 6 years. In some cases no apparent macroscopic damage such as coating spallation was observed in coatings. Thermal spray processes examined in this work included plasma spray, High Velocity Oxy Fuel (HVOF), and Detonation Gun. Some thermal spray coatings have demonstrated superior corrosion protection for the plain carbon steel substrate. In particular the HVOF and Detonation Gun thermal spray processes produced coatings with low connected porosity, which limited the growth rate of corrosion products. It was also demonstrated that these coatings resisted spallation of the coating even when an intentional flaw (which allowed for corrosion of the carbon steel substrate underneath the ceramic coating) was placed in the coating. A model for prediction of the corrosion protection provided by ceramic coatings is presented. The model includes the effect of the morphology and amount of the porosity within the thermal spray coating and provides a prediction of the exposure time needed to produce a crack in the ceramic coating.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 900124
• Report Number(s): UCRL-JRNL-203311
• Journal Information: Metallurgical and Materials Transactions, vol. 36A, n/a, May 1, 2005, pp. 1085-1095, Journal Name: Metallurgical and Materials Transactions, vol. 36A, n/a, May 1, 2005, pp. 1085-1095
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
22 GENERAL STUDIES OF NUCLEAR REACTORS
36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
42 ENGINEERING
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBON STEELS
CERAMICS
COATINGS
CONTAINERS
CORROSION
CORROSION PRODUCTS
CORROSION PROTECTION
DEFECTS
EXPLOSIONS
GROUND WATER
MORPHOLOGY
OXIDES
POROSITY
RADIOACTIVE WASTES
SPALLATION
SPRAY COATING
SUBSTRATES