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Title: AN EVALUATION OF THE CORROSION AND OXIDATION RESISTANCE OF HIGH-TEMPERATURE BRAZING ALLOYS. Period covered: July 1954-September 1955

Abstract

Many of the brazing alloys which were investigated were highly promising for sodium-to-air radiator service. Alloy systems of Ni-- Si-- B, Ni-- Cr-- Si-- B, and Ni-- Cr-- Si were especially favorable. Precious-metal alloys were, in general, severely attacked by sodium, as were many of the silicon-free, chromium- free, phosphorus-bearing alloys. Alloys containing manganese, tin, or copper exhibited poor resistance to oxidation at 1500 deg F. In most cases, oxidation was more pronounced at 1700 deg F. For fused-fluoride-tosodium heat exchanger service, the alloy systems Ni-- Cr-P, Ni-- Cr-- Si-- B, Ni-- Si-- B, and Ni-- Ge-- Cr-- Si show promising corrosion resistance. Although the Ni-- Cr-- Si alloy was compatible with sodium, it was severely attacked by the fluoride bath. The binary alloy 88 Ni-- 12 P (alloy A-10) was incompatible with sodium but possessed good resistance to fluoride attack. Tests seem to indicate that complex alloy systems containing varying percentages of silicon and phosphorus as minor constituents may be compatible with both sodium and the fused salts, whereas the binary alloys exhibited compatibility with only one of these testing media. The only brazing alloys found to be compatible with fused sodium hydroxide were precious-metal alloys such as 82more » Au-- 18 Ni. In evaluating the corrosion and the oxidation resistances of a brazing alloy for a specific application, emphasis was placed on the seesawcorrosion and cyclic-oxidation studies, since these tests more nearly simulate the expected operating conditions than do the static tests. It must be remembered, however, that before a brazing alloy is selected for a given operation it should be tested further under the conditions which would closely simulate service conditions. (auth)« less

Authors:
; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
4227334
Report Number(s):
ORNL-1934
NSA Number:
NSA-14-001804
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Technical Report
Resource Relation:
Other Information: Decl. Oct. 9, 1959. Orig. Receipt Date: 31-DEC-60
Country of Publication:
United States
Language:
English
Subject:
METALS, CERAMICS, AND MATERIALS; ALLOYS; BEARINGS; BORIDES; BRAZING; CHROMIUM ALLOYS; COPPER ALLOYS; CORROSION; FLUORIDES; FUSED SALTS; GERMANIUM ALLOYS; GOLD ALLOYS; HEAT EXCHANGERS; MANGANESE ALLOYS; MATERIALS TESTING; NICKEL ALLOYS; OXIDATION; PHOSPHORUS COMPOUNDS; SILICIDES; SODIUM; SODIUM HYDROXIDES; TIN ALLOYS

Citation Formats

Hoffman, E. E., Patriarca, P., Leitten, Jr., C. F., and Slaughter, G. M. AN EVALUATION OF THE CORROSION AND OXIDATION RESISTANCE OF HIGH-TEMPERATURE BRAZING ALLOYS. Period covered: July 1954-September 1955. United States: N. p., 1956. Web. doi:10.2172/4227334.
Hoffman, E. E., Patriarca, P., Leitten, Jr., C. F., & Slaughter, G. M. AN EVALUATION OF THE CORROSION AND OXIDATION RESISTANCE OF HIGH-TEMPERATURE BRAZING ALLOYS. Period covered: July 1954-September 1955. United States. https://doi.org/10.2172/4227334
Hoffman, E. E., Patriarca, P., Leitten, Jr., C. F., and Slaughter, G. M. 1956. "AN EVALUATION OF THE CORROSION AND OXIDATION RESISTANCE OF HIGH-TEMPERATURE BRAZING ALLOYS. Period covered: July 1954-September 1955". United States. https://doi.org/10.2172/4227334. https://www.osti.gov/servlets/purl/4227334.
@article{osti_4227334,
title = {AN EVALUATION OF THE CORROSION AND OXIDATION RESISTANCE OF HIGH-TEMPERATURE BRAZING ALLOYS. Period covered: July 1954-September 1955},
author = {Hoffman, E. E. and Patriarca, P. and Leitten, Jr., C. F. and Slaughter, G. M.},
abstractNote = {Many of the brazing alloys which were investigated were highly promising for sodium-to-air radiator service. Alloy systems of Ni-- Si-- B, Ni-- Cr-- Si-- B, and Ni-- Cr-- Si were especially favorable. Precious-metal alloys were, in general, severely attacked by sodium, as were many of the silicon-free, chromium- free, phosphorus-bearing alloys. Alloys containing manganese, tin, or copper exhibited poor resistance to oxidation at 1500 deg F. In most cases, oxidation was more pronounced at 1700 deg F. For fused-fluoride-tosodium heat exchanger service, the alloy systems Ni-- Cr-P, Ni-- Cr-- Si-- B, Ni-- Si-- B, and Ni-- Ge-- Cr-- Si show promising corrosion resistance. Although the Ni-- Cr-- Si alloy was compatible with sodium, it was severely attacked by the fluoride bath. The binary alloy 88 Ni-- 12 P (alloy A-10) was incompatible with sodium but possessed good resistance to fluoride attack. Tests seem to indicate that complex alloy systems containing varying percentages of silicon and phosphorus as minor constituents may be compatible with both sodium and the fused salts, whereas the binary alloys exhibited compatibility with only one of these testing media. The only brazing alloys found to be compatible with fused sodium hydroxide were precious-metal alloys such as 82 Au-- 18 Ni. In evaluating the corrosion and the oxidation resistances of a brazing alloy for a specific application, emphasis was placed on the seesawcorrosion and cyclic-oxidation studies, since these tests more nearly simulate the expected operating conditions than do the static tests. It must be remembered, however, that before a brazing alloy is selected for a given operation it should be tested further under the conditions which would closely simulate service conditions. (auth)},
doi = {10.2172/4227334},
url = {https://www.osti.gov/biblio/4227334}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Nov 01 00:00:00 EST 1956},
month = {Thu Nov 01 00:00:00 EST 1956}
}