ELECTROLESS-PLATED BRAZING ALLOYS
Technical Report
·
OSTI ID:4189503
The electroless-plating process deposits an Ni-P brazing alloy that exhibits excellent wetability and flowability in conjunction with each high- temperature alloys as austenitic stainless steels or Inconel when heated above the eutectic temperature in a dry hydrogen atmosphere. Complex tubeto-fin heat exchanger assemblies can be fabricated by preplating with electroless Ni-P alloy and then brazing at 1800 deg F in dry hydrogen. Electroless Ni-P brazed type 316 stainless steel and Inconel joints exhibit favorable oxidation resistance after exposure to air at temperatures up to 1500 deg F for extended periods of time. Electroless Ni-P brazed type 3l6 stainless steel joints exhibit poor corrosion resistance to sodium when exposed at 1500 deg F for 100 hr. The addition of chromium to the Ni-P brazing alloy by electredeposition provides a means for ensuring excellent oxidation resistance of the fillet. The resistance to sodium attack of the electroless Ni-P brazing alloy can be significantly improved by the addition of chromium by electrodeposition. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-14-008675
- OSTI ID:
- 4189503
- Report Number(s):
- ORNL-2243
- Country of Publication:
- United States
- Language:
- English
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