Substrate Corrosion of Plasma Coated Surfaces.
Abstract
To use a hard coating surface in a chemically active environment such as steam-lubricated bearings, it is important to prevent substrate corrosion. It is believed that coating porosity permitting entrapment of the condensate (water) may be responsible for the initiation of corrosion in a substrate containing chrome and carbides. This phenomenon was experienced on a shaft in storage several months after it was used in tests. A small scale investigation consisting of controlled experimentation on twelve hard coating specimens substantiated this explanation. The same investigation also showed that the use of a non-corrosive, non-porous undercoat which has an adequate bonding strength with both the substrate and the hard coating is effective in suppressing the problem. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1971
- Accession Number
- AD0722006
Entities
People
- Coda H. T. Pan
- Salvadore J. Calabrese