ELECTROLESS DEPOSITION OF NICKEL AND COBALT BASED ALLOYS
FRANKFORD ARSENAL PHILADELPHIA PA PITMAN-DUNN RESEARCH LABS
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The electroless deposition of nickel and cobalt from hypophosphite- based solutions has found numerous applications by virtue of characteristics unmatched by electrodeposition. For example, since deposition is produced by contact of the catalytic surface with the solution, exceptionally good deposit uniformity may be obtained. Also, the presence of phosphorus from hypophosphite in the deposits provides exceptional hardness 1 and corrosion resistance 2 to nickel and valuable magnetic properties 3 to cobalt. Electroless deposits may, in addition, be directly applied to non-conductive materials 4. Electroless deposition of copper 5 and palladium 6 has also been successfully applied utilizing formaldehyde and hydrazine reducing agents respectively. The electroless deposition process, at present, is limited to the four metals mentioned above. It was felt that electroless deposits with a wider variety of chemical, physical, and magnetic properties might be achieved by means of codeposition of other metals during electroless nickel or cobalt deposition.
- Properties of Metals and Alloys
- Fabrication Metallurgy