Electro-spark deposited coatings for fossil energy environments

Conference · Thu Jul 01 04:00:00 EDT 1993

OSTI ID:140136

Johnson, R N ^[1]

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1. Westinghouse Hanford Company, Richland, WA (United States)

Electro-Spark Deposition (ESD) is a micro-welding process that uses short-duration, high-current electrical pulse to deposit or alloy an electrode material on a metallic substrate. The ESD process has been used to markedly improve the corrosion resistance and wear resistance of base metals by alloying appropriate materials into the surface. One of the most attractive developments has been the use of ESD to apply Fe{sub 3}Al- and FeAl-base materials to surfaces of iron alloys. The evolutionary developments of the aluminides as coatings include the further improvement in the sulfidation corrosion performance by the ESD addition of refractory metal diffusion barriers between the substrate metal and the aluminide coating and by ESD additions of modifying elements to an Fe{sub 3}Al or FeAl surface. Significant advances are also in progress in developing improved ESD equipment and process controls, and in developing commercial applications through technology transfer activities.

• Research Organization: Oak Ridge National Lab., TN (United States)
• OSTI ID: 140136
• Report Number(s): ORNL/FMP--93/1; CONF-9305135--; ON: DE94001091
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CORROSION RESISTANCE
ELECTRODEPOSITION
INTERMETALLIC COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
SURFACE COATING
TECHNOLOGY TRANSFER
WEAR